#robotics Logs
Nov 02 2013
#robotics Calendar
00:06 defaultro hey folks, do L7805 regulate 12v to 5v?
00:07 GargantuaSauce_ yes. and note that it will be dissipating power equal to the drawn current * the voltage difference
00:07 GargantuaSauce_ so 200mA would make for 1.4W
00:07 GargantuaSauce_ which would likely require a heatsink
00:08 defaultro k
00:08 defaultro but i am confused with this, http://www.st.com/web/catalog/sense_power/FM142/CL1015/SC315/PF63279
00:08 defaultro it says, Output voltages of 5; 6; 8; 8.5; 9; 12; 15; 18; 24 V
00:08 defaultro how do i make sure it outputs only 5v
00:09 GargantuaSauce_ if it's a 7805 it's 5v
00:09 GargantuaSauce_ the last two digits is the output voltage
00:09 defaultro oh ok
00:09 defaultro so i'm assuming there is a 7806 for 6v
00:09 defaultro got it
00:09 defaultro :)
00:09 defaultro thank you so much!
00:09 defaultro i'm trying to figure out how to connect a cap when using this regulator
00:10 GargantuaSauce_ a big one before and a small one after
00:10 GargantuaSauce_ both in parallel with the regulator/load
00:14 defaultro is this correct? http://www.instructables.com/files/deriv/F27/2F5S/H5TU8LLD/F272F5SH5TU8LLD.LARGE.jpg
00:14 GargantuaSauce_ yes
00:14 defaultro i have a 100uF and a 470uF
00:15 defaultro so 470uF will be before the input and 100uF will be on the output. correct?
00:15 GargantuaSauce_ yeah, usually the output one is considerably smaller though
00:15 GargantuaSauce_ but i imagine the things you're powering with it have their own decoupling capacitors
00:15 defaultro so 100uF is still big?
00:16 GargantuaSauce_ it'll do
00:16 defaultro why is 470uF smaller in physical size that the 100uF?
00:16 defaultro but the number is bigger
00:16 GargantuaSauce_ check the voltage ratings
00:16 defaultro 35v on 470uv and 50v on 100uF
00:16 defaultro is that fine?
00:16 defaultro i'm inputing 12v and output 5v
00:17 GargantuaSauce_ yes it's fine, just pointing out that size is proportional to both the voltage and capacitance rating
00:17 defaultro is it bad if I put the same 470uF?
00:18 defaultro which would you recommend, 470uF and 100uF vs 470uf and 470uF?
00:18 GargantuaSauce_ 100
00:18 defaultro cool
00:18 defaultro i'm hooking it up now
00:18 defaultro brb
00:18 GargantuaSauce_ one generally avoids putting big caps on regulator outputs because when the input power is switched off it will discharge backwards through the regulator
00:18 GargantuaSauce_ which is not awesome for it
00:18 GargantuaSauce_ but it's fine for now
00:24 ItsAllMyFault 7805 need a minimum of 7.5v on it's input to regulate, otherwise its just a resistor
00:26 ItsAllMyFault 7805 has a spec sheet, rtfm
00:26 MrCurious hot glue i... hot
00:27 GargantuaSauce_ yeah the burns suck
00:28 GargantuaSauce_ the stuff that melts at a lower temperature rules, you can apply it using your finger with only minor discomfort
00:28 defaultro input is 12v
00:28 defaultro i connected it and it worked but the vfd is weird
00:29 defaultro vacuum flourescent display
00:29 ItsAllMyFault http://www.goodluckbuy.com/18dof-six-feet-6legged-intelligent-robot-spider-metal-frame-kit-silver.html <<== $60
00:29 defaultro there is like orange lines that are showing up
00:29 defaultro I'll check if output is 5v
00:30 GargantuaSauce_ what is the regulator's output connected to on the arduino
00:31 ItsAllMyFault doesn't matter, a 7805 won't regulate to5v off a 6v battery
00:31 GargantuaSauce_ shut the fuck up if you're not going to be reading his messages
00:32 ItsAllMyFault you shut the fuck up
00:33 ItsAllMyFault he is running it on a 6v lantern battery, despite me saying to use 12v yesterday
00:33 GargantuaSauce_ [02:15:38] <defaultro> input is 12v
00:34 ItsAllMyFault if any of his electronics are running, it's because they are 3.6v tolerant
00:35 GargantuaSauce_ your omniscience is lacking
00:37 ItsAllMyFault just going by what he said in channel before i put him on ignore for not doing his reading assignments
00:37 GargantuaSauce_ yes, hence the shut the fuck up
00:37 GargantuaSauce_ because your continual presumptions are wrong
00:37 ItsAllMyFault you shut the fuck up
00:37 ItsAllMyFault he SAID he was using 6v lantern battery
00:37 GargantuaSauce_ your advice based on fantasy and conjecture is not useful to anyone
00:38 evil_dan2wik defaultro, Are you using this said lantern battery or not?
00:38 ItsAllMyFault [22:28] <defaultro> it's a lantern battery <<-- yesterday
00:38 evil_dan2wik Maybe he has 2
00:39 evil_dan2wik or it could be an SLA, My SLA is labelled lantern battery
00:39 evil_dan2wik it is 12v
00:40 ItsAllMyFault [22:25] <defaultro> GuShH: I used my 6v battery. Reading was 5.81. When motor started, it dropped to 5.62
00:40 evil_dan2wik Is he still using it though?
00:40 ItsAllMyFault <shrug>
00:41 defaultro oh no, what's going on here, lol
00:41 evil_dan2wik No use getting constipated over 1 discrepancy
00:41 defaultro ItsAllMyFault: that is old
00:41 GargantuaSauce_ delusional behaviour
00:41 defaultro i'm using my 12v ps supply right now
00:41 ItsAllMyFault it's not delusional that i read what he said and that was thelast thing he said that i was interested in
00:41 evil_dan2wik PS supply > Power Supply Supply
00:42 GargantuaSauce_ kat if you're going to ignore his CURRENT information you need to not participate in this discussion
00:42 evil_dan2wik ItsAllMyFault, <defaultro> input is 12v
00:42 evil_dan2wik If he says the input is 12v, Then believe him.
00:42 GargantuaSauce_ so in an attempt to sidestep all this horseshit, what was the result of the measurement defaultro?
00:42 ItsAllMyFault evil_dan2wik, i might
00:43 ShH wonders why ItsAllMyFault loves the attention so
00:44 evil_dan2wik kick him
00:44 GuShH who?
00:44 GargantuaSauce_ because this is the extent of her contact with the outside world
00:44 GuShH That's sad
00:44 GuShH I'm starting to think she caused all of her troubles
00:44 ItsAllMyFault correct, and you just went on ignore too
00:44 GuShH Some built up anger from the past
00:44 GargantuaSauce_ finally
00:45 b0t1 rubs GuShH b
00:45 R0b0t1 shh
00:45 R0b0t1 it'll be okay
00:45 ShH f
00:45 R0b0t1 oh I thought GuShH had built-up anger
00:45 R0b0t1 guess it was gas
00:45 GuShH R0b0t1: kat does
00:45 R0b0t1 Kat?
00:45 ItsAllMyFault what?
00:45 GuShH Some people in her condition often end up like that, blaming everything and everyone over whatever happened to them.
00:46 evil_dan2wik Getting fussed over someone else's problem
00:46 GuShH They also milk it in every possible way.
00:47 defaultro here is what I am doing right now
00:47 defaultro 12v+ from ps is connected to L7805 pin 1
00:47 evil_dan2wik Is it getting hot?
00:48 defaultro from there, I hooked the red probe on output of 7805 and black on GND, reading was 0.77. Weird.
00:48 evil_dan2wik Usually, If it doesn't get hot, Its not in backwards.
00:48 defaultro however for my troubleshooting, i removed the caps
00:49 defaultro not sure if it's required
00:49 defaultro I was just hoping that I'll see 5v on the output on my multimeter
00:49 defaultro but didn't see 5v
00:49 defaultro i'll try another 7805
00:49 evil_dan2wik If the caps are in backwards, the regulator will get hot and then the caps will explode.
00:49 defaultro i didn't put caps
00:50 evil_dan2wik Is the regulator getting hot/warm?
00:50 GuShH likewise if the regulator is backwards, you won't get the desired effect.
00:50 evil_dan2wik Is the power coming from the power supply?
00:50 defaultro i would like to know first if output of 7805 will show 5v
00:50 defaultro yes, it's coming from 12v ps
00:50 GargantuaSauce_ put the caps on and then measure
00:50 GuShH it could also be oscillating...
00:50 GuShH just double check your pinout, also where did you get them from?
00:50 evil_dan2wik Are you able to get a reading from the input pins on the regulator?
00:50 defaultro is there a difference if caps weren't there?
00:50 GargantuaSauce_ they don't necessarily behave well with no load and no capacitance
00:50 GuShH I once got a big bag full of fake LM317s from eBay
00:50 defaultro evil_dan2wik: , I did and I got 12v
00:50 evil_dan2wik Caps usually only stablise power.
00:51 GuShH hrm?
00:51 defaultro that's what I thought that is why i had to remove it firs
00:51 evil_dan2wik and store*
00:51 defaultro yup
00:51 evil_dan2wik Should not need them until the regulator is actually outputting.
00:51 ShH wants to watch jackass presents bad gra
00:51 defaultro i will try another L7805
00:51 defaultro so L7805 is a regulator right?
00:51 GuShH defaultro: what's your load?
00:51 GuShH peak and nominal
00:51 GuShH it is a linear reg.
00:52 defaultro GuShH: 12v+ ps is connected directly to pin 1 of L7805
00:52 GuShH if you exceed it's rated output it will "current limit" so your voltage won't be 5v anymore.
00:52 defaultro oh
00:52 GuShH 1A or so
00:53 evil_dan2wik The only form of current limiting it has is get hot and burn your fingers.
00:53 GuShH not really evil_dan2wik.
00:53 defaultro ps output is 12v 1A as written on the ps
00:53 evil_dan2wik yes.
00:53 GuShH that's simply because it's dropping voltage.
00:53 defaultro what is the input that L7805 can take?
00:53 GuShH and if you've burnt your fingers, that's your own issue. try and sue the manufacturer if you feel like it.
00:54 GuShH defaultro: check the datasheet
00:54 GuShH under 30v surely.
00:54 evil_dan2wik defaultro, 12v to Vin, GND to GND and then GND to GND, Vout to power rail
00:54 defaultro ?
00:54 defaultro I am using UNO
00:54 defaultro and yes, I do have that config
00:54 GuShH UNO for ZEROS
00:55 evil_dan2wik If you are using an external regulator, Plug it into the 5v pin
00:55 defaultro however, I have a direct connection from 12v+ ps to the L7805 pin1
00:55 GuShH defaultro: grounds should be shared
00:55 evil_dan2wik If you are using that regulator to power an external device, the power goes into the UNO's vin pin straight from the power supply.
00:55 defaultro yes, all ground are shared on my setup
00:56 GuShH meet it's minimum load requirements and decouple where neccessary
00:56 GuShH apply a 10mA load and measure it's output (pin 3)
00:56 evil_dan2wik Photos might help.
00:56 evil_dan2wik If possible
00:56 defaultro evil_dan2wik: I wanted to add L7805 to offload current from the arduino when powering the vacuum flourescent display
00:57 evil_dan2wik How much does that draw?
00:57 defaultro previously, I have 5v+ out of UNO to vfd pin1
00:57 evil_dan2wik ok
00:57 defaultro however, using this configuration, the regulator on UNO is heating up quickly
00:57 defaultro the 2 circles near the jack barrel
00:58 ShH raises an eye
00:58 defaultro i removed the vfd and the regulator didn't heat up anymore
00:58 evil_dan2wik So, Plug the power supply directly into the UNO's vin pin, It should use the onboard regulator, Then use the external regulator to power the display
00:58 defaultro i placed it back, regulator heated up again
00:58 defaultro yes, that's what I have right now
00:58 evil_dan2wik ok.
00:59 ShH wonders why this isn't taking place in #arduino ins
00:59 defaultro but what happened was that the vfd showed like an orange line like from an electrical oven
00:59 GuShH that's it's heater
00:59 defaultro looks like the voltage coming out of 7805 was too much
00:59 GuShH you made a boo-boo
00:59 defaultro so i removed it quickly
00:59 GuShH make it a habit to measure twice first
00:59 defaultro i mean, turned it off
00:59 GuShH don't just hook shit up.
00:59 defaultro will do
00:59 GuShH that's how expensive mistakes are made :p
00:59 defaultro i turned it off but didn't remove the vfd
01:00 defaultro when it was off, I removed the vfd
01:00 GargantuaSauce_ and you definitely need to learn some theory before you'll get much further i think
01:00 defaultro i started troubleshooting
01:00 defaultro will do sir
01:00 GargantuaSauce_ did you get Getting Started In Electronics?
01:00 GargantuaSauce_ it has happy little electrons
01:00 defaultro so i placed red probe on pin 1 to make sure it was 12v. It was
01:00 GargantuaSauce_ there is not a finer source of knowledge
01:00 evil_dan2wik Wait wait wait.
01:00 defaultro so I moved the red probe to the output of 7805, I was reading 0.77
01:01 evil_dan2wik Are you even current limiting it?
01:01 defaultro what is that?
01:01 evil_dan2wik -_-
01:01 defaultro i thought that L7805 will convert 12v to 5v
01:01 GuShH defaultro: don't you have a driver board for the vfd?
01:01 defaultro no, I don't have
01:01 GuShH how are you driving the heater then
01:01 GuShH a resistor?
01:02 defaultro none
01:02 ShH s
01:02 defaultro i just hooked them directly to the UNO
01:02 evil_dan2wik You need a current limiter...
01:02 defaultro pin 1 to 5v+
01:02 defaultro pin 2 which is data to an input in UNO
01:02 GuShH on pin 1 I recall it was VCC, as in, it was an integrated module
01:02 defaultro pin 3 to GND
01:02 GuShH not a bare VFD
01:02 defaultro yes, it's VCC
01:02 sAllMyFault raises a
01:02 evil_dan2wik The screen is the equivalent of a short, Just like an LED
01:02 evil_dan2wik Just more shorty.
01:02 defaultro this works but looks like I'm waiting for something to happen bad
01:03 GuShH so it most likely already has the proper driver for the heater, you did however exceed it's rated voltage for a moment
01:03 defaultro got it
01:03 GuShH evil_dan2wik: it actually isn't and it depends on the size and amount of heating elements...
01:03 defaultro however, how come i wasn't getting 5v output on 7805?
01:03 GuShH take it all apart and start from scratch
01:03 evil_dan2wik Got to go for about an hour.
01:03 defaultro will do again
01:03 defaultro brb, i'll be quick
01:04 GuShH I think I've got better chances hitting a rat in a dark alley with a blindfold and a rusted up .38 revolver than guessing whatever it is you did.
01:04 evil_dan2wik Pretty sure you need a resistor in the line to prevent burn outs
01:04 GuShH typically you just use an lm317 setup as a current source, for the heater... or, for small vfds, just a resistor to get by.
01:04 GuShH there are of course specific ICs for this
01:05 defaultro i would like confirmation though that the middle pin is GND?
01:06 GuShH it is
01:06 defaultro ok will do
01:06 defaultro and then it was mentioned earlier if I was using a resistor. I wasn't. If i'm going to add it, where do I connect it?
01:06 GuShH ignore that
01:06 defaultro k
01:06 defaultro i'll continue with the wiring
01:06 GuShH evil_dan2wik assumed you were using a bare VFD screen
01:07 GuShH (just the glass envelope and the leads coming out, for the uninitiated)
01:07 GuShH you have a vfd module, it already takes care of everything.
01:07 defaultro yes, I see 5v now
01:07 defaultro looks like the first one I used was bad
01:07 GuShH crap... 3AM
01:08 defaultro i'll try the other l7805 again
01:09 GuShH do you have a 100 ohm resistor? it will be on the limit of it's power handling if it's a 1/4W one, but it should draw 50mA, this way you have a known load and you can probe the output voltage of the regulator, without anything else in the way
01:09 GuShH or try two 1K resistors in parallel, giving you 500Ohms (a load of 10mA)
01:11 GuShh_ hum
01:12 GuShh_ actually the L7805 already has it's minimum load met internally, the quiescent current is about 6mA
01:13 GargantuaSauce_ yeah and will happily throw around 1.5A until thermal cutoff
01:13 GuShh_ 4.8 to 5.2v output expected
01:13 GuShh_ Got rusty on some of these common ICs, been a while
01:14 GargantuaSauce_ there are a bunch of subtly different 7805s
01:14 defaultro the vfd screen turned on well without the orange lines
01:14 defaultro so could caps be the culprit?
01:14 defaultro there are no caps right now
01:14 defaultro output is 5.02v
01:14 GuShh_ I don't see how.
01:14 GargantuaSauce_ well it's not inconceivable that the 100uf one could be failed short
01:15 GuShh_ but that wouldn't make the 7805 output over 5v
01:15 defaultro i put a 470uF on + where input1 of 7805 is connected
01:15 defaultro then i put 470uf's neg on GND
01:15 defaultro that's correct right>?
01:15 GuShh_ sure
01:15 defaultro I followed this, http://www.instructables.com/files/deriv/F27/2F5S/H5TU8LLD/F272F5SH5TU8LLD.LARGE.jpg
01:15 GuShh_ damn that site
01:15 defaultro then on the output side, I put 100uF
01:16 GuShh_ get a datasheet, you'll get pretty good schematics from it.
01:16 GuShh_ there's no actual need for 100uF, it was a number they pulled out of their arse.
01:17 defaultro so a single 470uf before the L7805 is sufficient?
01:17 GuShh_ but that still shouldn't have caused the 7805 to exceed it's rated output, chances are you miswired something
01:17 defaultro ok
01:17 GuShh_ the answer to all your questions is "it depends" and go check the datasheet :p
01:17 GuShh_ find the test circuits, study them
01:17 defaultro ok, I thought we can just put whatever value we like. Got it
01:18 defaultro test circuit uses 0.33uF
01:18 defaultro http://html.alldatasheet.com/html-pdf/22645/STMICROELECTRONICS/L7805CP/6499/4/L7805CP.html
01:18 GuShh_ these are minimum capacitances required or desired for the particular part, on particular scenarios
01:18 defaultro i don't have a 0.33 and but I have 100nF
01:19 defaultro 0.1uF is 100nF right?
01:19 GuShh_ you can put 3 of those 100nF in parallel to obtain 0.30uF (well, not really, it won't be 0.3 exactly since they are most likely +/- 10% at best
01:19 defaultro and it's a filter cap?
01:19 GuShh_ but it's not required
01:19 GuShh_ it acts by decoupling the power source
01:20 Shh_ wonders why the washing machine keeps throwing error codes on it's dis
01:20 defaultro mine is like this, http://cpc.farnell.com/productimages/farnell/standard/42245813.jpg
01:20 defaultro that's the one right? My 470uF looks different. it has a + and -
01:20 GuShh_ looks more like tantalum than ceramic, but surely it must be ceramic
01:20 GargantuaSauce_ read books!
01:20 GuShh_ if there's no + sign it's a ceramic
01:20 GuShh_ tantalums are nasty for beginners
01:21 defaultro ok
01:21 GargantuaSauce_ seriously you'll have a much better handle on this if you know the basic lumped element laws and component types
01:21 GargantuaSauce_ a little understanding goes a long way
01:21 defaultro will do
01:21 GuShh_ I'd start by not browsing instructables.com
01:21 GargantuaSauce_ wrong tense! right now!
01:21 defaultro for now, I'm reading this, http://html.alldatasheet.com/html-pdf/22645/STMICROELECTRONICS/L7805CP/6499/4/L7805CP.html
01:21 defaultro it's a datasheet. what does Co and Ci mean?
01:22 GuShh_ capacitor input
01:22 GargantuaSauce_ because you'll be stuck in a state of blunder as long as you're following directions like that instructables
01:22 GuShh_ capacitor output
01:22 defaultro cap input and cap output?
01:22 defaultro i was right :)
01:22 GuShh_ most instructables are made by arduinians anyway
01:22 defaultro looking at the datasheet, on cap output, it says 0.1uF which is 100nF. Correct?
01:22 GargantuaSauce_ yup
01:22 GuShh_ yes
01:23 defaultro I was showing my 100nF earlier. Is that the one? http://cpc.farnell.com/productimages/farnell/standard/42245813.jpg
01:23 GuShh_ you don't have to follow the test circuits explicitly, but they do give you good guidelines.
01:23 defaultro ok. It's because on cap output, I put 100uF earlier
01:23 GuShh_ do you have old crap you can take apart to learn from?
01:23 defaultro oops
01:23 GuShh_ it's not a problem
01:23 defaultro it's because earlier when I had the issue, I put 100uF on cap output
01:23 GuShh_ it will change the rise time of the output, but this is irrelevant to your application :)
01:24 GuShh_ it does have a different esr, but this regulator doesn't particularly care
01:24 defaultro ok
01:24 defaultro how come my 470uF has a +- while my 100nF doesn't have any polarity?
01:24 GuShh_ because not all capacitors are polarized
01:24 defaultro got it
01:25 GargantuaSauce_ capacitors consist of two metal plates and a dielectric
01:25 defaultro cool, i will add those now
01:25 GargantuaSauce_ the former is an electrolytic capacitor, ie the dielectric is an electrolyte
01:25 defaultro k
01:25 defaultro 1 sec
01:26 Shh_ raises his other eye
01:26 GargantuaSauce_ if a reverse voltage is applied to them a nonreversible redox reaction takes place and it blows up
01:26 Shh_ raises it some
01:27 GuShh_ well not if your source is current limited and you just wanted to tease the electrolyte.
01:27 GargantuaSauce_ lol
01:27 GargantuaSauce_ anyway non-polarized caps use a polymer or ceramic dielectric and those don't give a shit which way voltage is applied
01:28 GuShh_ Do they still use paper caps in Russia?
01:28 GargantuaSauce_ i don't know any russian EEs to ask!
01:29 defaultro it's running right now with that caps on
01:30 defaultro earlier when VFD was being powered by 5v+ on UNO, the regulator near the barrel jack was heating up badly after 2 mins
01:30 defaultro now it's being powered externally, we'll find out
01:33 GuShh_ defaultro: you were drawing too much current, it's not meant for that
01:33 GuShh_ use it's power for logic only
01:34 defaultro right now, the only difference is that I am getting power externally for the vfd
01:34 GuShh_ which is the right way to do it
01:34 defaultro i will check the regulator now on the UNO. I hope it's not hot
01:34 GuShh_ it shouldn't be unless you made another mistake :p
01:34 defaultro it's not :)
01:36 Shh_ detects a crapload of take rifle scopes on
01:36 GuShh_ fake*
01:36 defaultro I'm assuming that L7809 outputs 9v
01:36 GuShh_ you assume right
01:37 GuShh_ but assumptions will get your ass electrocuted and shot
01:37 defaultro looking at the datasheet now
01:37 GuShh_ in no particular order
01:37 defaultro that's true :)
01:37 Shh_ looks at bushnell's site and cannot find these models, even though they are "
01:38 defaultro can't find a data sheet for 7809
01:39 GuShh_ it's the same oen
01:39 defaultro http://www.datasheetarchive.com/dlmain/Datasheets-X2/DSA827000895.pdf
01:40 defaultro so yup, it says 9v but doesn't say output
01:41 defaultro i'm going to touch the regulator again. It's been running for more that 15 mins now
01:41 defaultro awesome! it's not hot :D
01:42 GuShh_ oh yeah I was right, they do make fake bushnell scopes... god damn china
01:42 GuShh_ they aren't expensive scopes, but they copy them anyway what the hell
01:42 defaultro ok
01:43 Shh_ is u
01:43 defaultro ?
01:43 GuShh_ almost bought one.
01:43 defaultro which one?
01:44 GuShh_ bushnell banner 3-9 X 40
01:44 defaultro looking. not sure what it is
01:44 GuShh_ err 4-12 X 50
01:44 GuShh_ a rifle scope.
01:44 GuShh_ an expensive fake in this case
01:45 defaultro oh nice
01:45 defaultro wildlife shooting?
01:45 GuShh_ no, plinking.
01:45 defaultro cool
01:45 Shh_ sh
01:47 GuShh_ seller avoided sending me a link of bushnell's site showing the actual model, that just confirms it for me
01:47 defaultro k
01:48 defaultro btw, what happens to output of L7805 when ps is 6v battery?
01:49 GuShh_ it won't reach 5v because it has a minimum dropout of about 2v
01:49 defaultro ok
01:49 GuShh_ so the minimum input voltage is about 7v
01:50 defaultro that means, I shouldn't buy 6v anymore
01:50 GuShh_ there are LDO regulators you can try if this is a requirement, and better solutions as well
01:50 defaultro ok
01:50 Shh_ keeps investigating the fake sc
01:50 GargantuaSauce_ http://dx.com/p/dc-3-2-40v-to-dc-1-2-35v-3a-auto-step-down-converter-voltage-regulator-black-177543
01:50 defaultro did I ever mention here what I was trying to make?
01:50 GargantuaSauce_ these are your new best friend
01:51 GuShh_ something about a camera dolly, or that was someone else
01:51 GuShh_ GargantuaSauce_: no better alternative directly from ebay?
01:51 defaultro yup
01:51 GargantuaSauce_ oh theres plenty, it's china after all
01:51 GargantuaSauce_ just providing a link i have on hand
01:51 defaultro what does that do GargantuaSauce_
01:51 GuShh_ I'm hating China today
01:51 defaultro that's too high though
01:51 GuShh_ it's a love-hate relationship after all
01:51 GargantuaSauce_ it's an adjustible SMPS module
01:52 GargantuaSauce_ a buck converter to be more specific
01:52 defaultro so it can do like that I just did? 12v to 5v?
01:52 defaultro that/what
01:52 GargantuaSauce_ yes, more efficiently too
01:52 defaultro i looked at the 3 pictures but can't find a knob for changing settings
01:52 GargantuaSauce_ the little brass screw, it's a multiturn variable resistor
01:53 GargantuaSauce_ when a linear regulator like the 7805 cuts 12v down to 5, it does so by dissipating the extra energy carried by the current travelling through it
01:53 defaultro oh ok
01:53 defaultro i'm tempted to buy it now
01:53 defaultro so how does it know that we want 12v? There is no number
01:54 GargantuaSauce_ you just adjust the output, and the input can be anything bigger
01:54 defaultro oh cool
01:54 GuShh_ no gun loving weirdos around?
01:54 GargantuaSauce_ an smps on the other hand just turns on and off quickly (hundreds of KHz usually) with a controlled duty cycle to regulate the output voltage
01:54 defaultro sothat means, I will turn it while it's connected to a multimeter
01:54 GargantuaSauce_ yeah
01:54 defaultro i don't need capacitors anymore. correct?
01:55 GuShh_ I got a bunch of step down boards from china not long ago, use them for all sorts of things
01:55 GargantuaSauce_ they are generally a good idea to sprinkle around
01:55 GuShh_ they're all in the board though
01:55 defaultro cool
01:55 defaultro I'll get two now
01:55 defaultro is that a good price? $3.50
01:55 GuShh_ let me see
01:55 defaultro http://dx.com/p/dc-3-2-40v-to-dc-1-2-35v-3a-auto-step-down-converter-voltage-regulator-black-177543
01:55 GargantuaSauce_ it's pretty good, you might be able to find cheaper there on dx or on fleabay though
01:55 GuShh_ I can get you a better deal
01:56 GargantuaSauce_ http://dx.com/p/15a-dc-4-32v-to-dc-1-2-32v-converter-buck-adjustable-electronic-power-regulator-219807 i am messing with this one now
01:56 GargantuaSauce_ it's friggin beefy
01:56 GuShh_ let me find the link ... I've bought plenty from ebay
01:56 defaultro that's expensive though
01:56 GuShh_ it's 15A
01:56 GuShh_ hence beefy
01:56 defaultro would that mean it would be able to take 1-15A?
01:57 GargantuaSauce_ it can supply 15A yes
01:57 defaultro the other one is only 3.2A
01:57 GargantuaSauce_ well or potentially more i am not sure
01:57 GuShh_ it's rated 15A max, whether it can handle it for a long period of time without forced cooling that's up to the alignment of the stars and other shit.
01:57 GargantuaSauce_ the INPUT is fused at 15A
01:57 defaultro can we set output to only like 2A?
01:57 GargantuaSauce_ the amount of current drawn is determined by the load
01:57 GargantuaSauce_ V=IR
01:58 GargantuaSauce_ theory dude!
01:58 GuShh_ you only take as much as you need, that doesnt seem to be a constant current source, but you could turn it into one most likely
01:58 defaultro k
01:58 rgantuaSauce_ cracks the
01:58 GuShh_ that whip, it better be wet.
01:58 GargantuaSauce_ wet with the blood of arduinians
01:58 Shh_ nurses a
01:59 defaultro i touched the regulator again on the UNO, it's not hot :D
01:59 defaultro thank you folks!!!
01:59 GuShh_ o.O
02:01 defaultro I'll buy this one for now, http://dx.com/p/dc-3-2-40v-to-dc-1-2-35v-3a-auto-step-down-converter-voltage-regulator-black-177543
02:01 GuShh_ wait
02:01 defaultro oh ok
02:01 GuShh_ http://www.ebay.com/itm/New-LM2596HV-LM2596S-DC-DC-Step-Down-CC-CV-Adjustable-Power-Supply-Module-/180947008880?pt=LH_DefaultDomain_0&hash=item2a21483d70
02:01 GuShh_ I've bought these, they're fine and you can get two for the price of one
02:02 defaultro looking
02:02 GuShh_ dx.com is a ripoff of huge proportions.
02:02 GargantuaSauce_ yeah always shop around
02:02 GuShh_ they're part of an "ups" I made for the modem / router heh
02:02 defaultro that's a little expensive by few cents
02:02 GuShh_ huh?
02:02 defaultro and will take 15-20 days
02:02 GuShh_ ...as will dx
02:03 GuShh_ it costs half the price what the hell do you want
02:03 defaultro k
02:03 defaultro i'll order it now
02:03 GuShh_ for me it's more than 1 month
02:03 GuShh_ usually.
02:03 GuShh_ specially now that xmas is coming
02:04 defaultro yup
02:04 defaultro i think i need to solder my project to a matrix
02:05 defaultro it's been on this breadboard for more than a month now
02:05 GargantuaSauce_ relevant keyword is "perfboard" or protoboard
02:05 Shh_ hands defaultro a red
02:05 defaultro cool
02:05 defaultro :)
02:05 GargantuaSauce_ http://xn--d-bga.su/GSIE.pdf this is your new bible
02:06 defaultro awesome
02:06 defaultro I will print it at work
02:06 defaultro or if there is a book, I will buy it
02:06 GuShh_ lol
02:06 GargantuaSauce_ i think it might be out of print, not sure
02:06 Fiesta what's the go with this website?
02:06 Fiesta desu
02:07 GargantuaSauce_ it's just where i stick random crap
02:07 defaultro or maybe, I will print 20 pages per day next week, LOL
02:07 GargantuaSauce_ costs me 600 rubles a year
02:07 Fiesta fair nuff
02:07 Fiesta spent too long in web2.0, almost forgotten the whole concept of personal websites.
02:08 defaultro thanks for the link GargantuaSauce_ ;)
02:08 defaultro this electronic hobby has been stealing my gym time for more than a week now, lol :)
02:08 GargantuaSauce_ i am uploading The Art Of Electronics too, will be awhile
02:08 defaultro cool
02:11 Fiesta is there some sort of common way of shorting out an entire header row (ie: http://i.ebayimg.com/00/$%28KGrHqIOKiwE4qGshn4%28BOOOu-w-dQ~~0_35.JPG ) into a common rail?
02:11 Fiesta i'm thinking of putting a huge chain of pin to pin jumper shunts across it. Others have suggested a single solder wire melted to each point
02:11 Triffid_Hunter Fiesta: I just put a bit of copper wire and bulk up with solder as necessary
02:12 GargantuaSauce_ yeah, that
02:12 Fiesta sounds messy, mind you so does my method
02:12 GargantuaSauce_ oh it is
02:12 GargantuaSauce_ http://workman-industries.net/images/hexapod/servoboard_back.jpg
02:13 Fiesta hah. yeah that's horrid-awesome
02:13 GargantuaSauce_ :)
02:13 GargantuaSauce_ that's without a wire, just solder blobs dragged along
02:13 GargantuaSauce_ wire would make it neater
02:14 Fiesta using jumper shunts sounds nicer. (ie: http://i.ebayimg.com/00/s/NTAwWDUwMA==/z/DbIAAMXQLs5RsFYL/$T2eC16ZHJFsFFR-%28EEh9BRsFYLEkC!~~60_12.JPG )
02:14 Shh_ wonders if Fiesta is Mex
02:14 GargantuaSauce_ how would that short the whole row?
02:14 Fiesta if the pins come out teh top of teh jumpers, you can put multiple jumpers on each pin. so a daisy-chain
02:15 Fiesta connect 1-2, 2-3, 3-4, etc
02:15 defaultro is this a good idea? Let's say I have a 12v lithium battery. I will regulate down to 6v and power the stepper motor at 6v. I was using 6v battery previously without any issues
02:15 GargantuaSauce_ powering a motor with a linear regulator is a bad idea for a handful of reasons
02:15 GuShh_ how are you managing the lithium?
02:15 defaultro oh ok
02:15 evil_dan2wik Welcome! I am back.
02:16 GuShh_ evil_dan2wik: go back to #arduino we don't want your kind!
02:16 GargantuaSauce_ Fiesta if the pins are actually long enough that'd work
02:16 defaultro GuShh_: what do you mean by "how am I managing the lithium"?
02:16 evil_dan2wik GuShh_, R00d
02:16 GargantuaSauce_ all the jumpers i have are as long as the standard length pins though
02:16 GuShh_ evil_dan2wik: wat
02:16 GuShh_ defaultro: charge management
02:16 GuShh_ and discharge as well, since it's lithium
02:16 evil_dan2wik GuShh_, Why do you not want me here
02:17 GuShh_ evil_dan2wik: I'm just kidding
02:17 defaultro i'll have a charger that I can use when it's low and not in use
02:17 GuShh_ ok
02:17 GuShh_ but you still need to have a protection circuit
02:17 GargantuaSauce_ defaultro if you're using one of those monolithic stepper drivers, it'll have adjustable duty cycle so you can have a considerably higher input voltage than the stepper would otherwise handle
02:17 evil_dan2wik So, Is your display still blowing up?
02:17 defaultro oh
02:17 Fiesta yeah there are smaller jumpers (ones in pic are 3.5mm high, vs 5.9mm high for normal ones)
02:17 GuShh_ or monitor the voltage so you don't go under the minimum
02:17 defaultro got it
02:18 GargantuaSauce_ sounds fine as long as you don't need much current then
02:18 defaultro you mean, when power stored runs out
02:18 GuShh_ those can handle several amps though
02:18 defaultro yes, I was thinking of buying the 6800mAh
02:19 defaultro i remember the total amp on the reading was 1.75
02:19 defaultro a 6800mAh lithium will last 3.8 hours
02:19 defaultro normally when I use this device outside, it takes 2.5 hurs
02:19 defaultro hours
02:20 evil_dan2wik Those figures are usually exagerated
02:20 defaultro ok
02:20 Fiesta GargantuaSauce: hangon, these 3.5mm high jumpers may have a different pin spacing... i may not have solved my prob oh well.
02:20 evil_dan2wik Probably 2:30 hours without damaging the battery
02:21 defaultro why did you mention damaging?
02:21 GuShh_ defaultro: per cell on lithium ion for instance you don't want to go under 3.4v or so
02:22 defaultro hey folks, is it normal my 12v power supply is warm
02:22 GuShh_ sure you are near it's rated output and it's probably under-rated chinese shit
02:22 defaultro GuShh_: when it's being drained?
02:22 GuShh_ but power dissipation exists everywhere and in everything
02:23 defaultro GuShh_: sure you are near it's rated output and it's probably under-rated chinese shit. You meant this for my 12v power supply right?
02:23 evil_dan2wik What is it rated for? What are you drawing?
02:23 GuShh_ he said 1A once
02:23 GuShh_ and he had a 1.2A load I recall
02:23 GuShh_ DONT TEST MY MEMORY
02:23 defaultro this 12v ps is 1A
02:23 evil_dan2wik ok.
02:23 defaultro load is 1.75
02:23 defaultro that's from my last test
02:23 GuShh_ oh so it went up?
02:23 defaultro yup
02:23 GuShh_ you are going to cook your psu
02:24 evil_dan2wik That is the reason it is warming up.
02:24 defaultro ah, that's why
02:24 GuShh_ you'd want a 2A at least, 3A to be safe
02:24 evil_dan2wik What type of power supply?
02:24 evil_dan2wik Just a wall wart?
02:24 defaultro i found out 1.75 when I put my multimeter in between ps and + on circuit
02:24 defaultro i set it to 10A
02:25 defaultro a regular wall wart i found in basement
02:25 GuShh_ don't forget to replace your probe jacks after measuring current
02:25 defaultro output is 12v, 1A
02:25 GuShh_ or you will blow something up eventually
02:25 defaultro thank you
02:25 GuShh_ I mean it, I once blew up a medium range dmm because I forgot.
02:25 defaultro now, is there a 12v battery that is rated 3A?
02:25 Fiesta look for a higher amp wall-wort to cut up. we've all got heaps lying around, old phone shargers etc.
02:25 GuShh_ went ahead to measure 220VAC from a genset and it went pop, didn't even blow a fuse since it blew a couple traces first
02:26 Fiesta *cahrgers
02:26 GuShh_ fixed it, no big deal.
02:26 defaultro will do
02:26 evil_dan2wik defaultro, Batteries are the easy thing to get.
02:26 defaultro most of the time, this device will be used outside so I need to look for a battery
02:26 GuShh_ batteries are rated by capacity
02:26 GuShh_ amp hour
02:26 defaultro ah
02:26 GuShh_ the maximum current draw depends on it's ESR
02:26 GuShh_ and chemistry in general
02:26 defaultro so I am safe with either 6800 mAh or the 8000 mAh
02:26 Fiesta have you considered a solar panel
02:26 GuShh_ Fiesta: make me a taco
02:26 defaultro i remember dividing 6800/1750
02:27 defaultro Fiesta: is that for me?
02:27 Fiesta a solar panel instead of a battery
02:27 Fiesta yes
02:27 Fiesta if outdoors, it can be very convinient
02:27 defaultro problem is that sometimes this device is used at night for night photography
02:27 Fiesta ah, nm
02:27 defaultro k
02:27 Shh_ s
02:27 evil_dan2wik Most batteries will supply 2A continuous, You just need to find the correct capacity to match.
02:27 defaultro yup, I iwll buy 8000mAh then
02:28 GuShh_ that's the sort of thing that comes out of someone's arse
02:28 Fiesta GuShh_ i am not of the mexican persuasion
02:28 GuShh_ that and amy winehouse.
02:28 evil_dan2wik will it really be used for 4 hours continuous?
02:28 defaultro so if 2A, 8000/2000 = roughly close to 3.5hrs to 4 hrs
02:28 defaultro yes evil_dan2wik
02:28 GuShh_ was it amy? what was her name
02:28 GuShh_ I forgot, I can only remember the list of drugs she was onto
02:28 GuShh_ or into, or snorting into, well you get the idea.
02:29 defaultro I made this and camera took like 3.5 hours doing this timelapse, http://www.youtube.com/watch?v=og9YdcFpib8
02:29 defaultro that's without my camera slider project. If you notice, the camera is still
02:30 defaultro and my latest one using the camera slider and a 6v battery but I was using LCD during this time and not the vfd, http://www.youtube.com/watch?v=c7Y93hxZdes
02:31 Fiesta that's beautiful. Also your name is Camara, it is a sign, you are the one.
02:31 defaultro hahaha :D
02:32 evil_dan2wik defaultro, I seem to have forgotten what you were doing. What are you doing?
02:32 defaultro i made a camera slider using UNO
02:32 zap0 defaultro, awesome! i've wanted to build one too.
02:32 defaultro this one, http://www.youtube.com/watch?v=A95uCHp5Q7Q
02:33 defaultro honestly, I feel like reverting back to lcd because it uses less power
02:33 defaultro the vfd looks cool though
02:35 zap0 isn't the point of it to have the camera mounted on the slider?
02:35 evil_dan2wik defaultro, Is that yours in the video?
02:35 defaultro yes, it's mine
02:35 evil_dan2wik ok.
02:35 defaultro zap0, i didn't get your question
02:35 evil_dan2wik The motor seems a little jolty.
02:35 evil_dan2wik defaultro, Isn't the point to have the camera on the silder?
02:36 defaultro yeah, I noticed but when I used the built-in stepper library on arduino, it's so quiet and strong but it makes the motor so hot
02:36 defaultro it is on the slider
02:36 defaultro the one on the video was my initial testing
02:36 zap0 oh
02:37 evil_dan2wik defaultro, Add some capacitors on the drivers?
02:37 defaultro i have caps on drivers
02:37 defaultro 100uF on each of TIp122
02:37 evil_dan2wik Ahh ok
02:37 evil_dan2wik Are the drivers still on the bread board?
02:37 defaultro on video, it still doesn't have it
02:37 defaultro yes
02:38 defaultro but latest one, i have caps
02:38 evil_dan2wik Should keep them off the bread board.
02:38 defaultro why?
02:38 defaultro i'm goign to mount them on perfboard soon
02:38 evil_dan2wik Currents of more than 500ma should stay off the bread board to avoid it welding itself in there.
02:38 defaultro oh ok
02:38 defaultro thanks for letting me know :)
02:39 evil_dan2wik The motor only draws the 2A when running right?
02:39 defaultro I really want to use the built in stepper library of arduino because using their library, I am able to incline the rails at 85 degrees. The stepper motor can lift the camera slider
02:39 defaultro yes, that's what I saw earlier
02:39 defaultro it started at 2A and after few minutes, it went down to 1.75A
02:39 defaultro not sure why
02:40 defaultro then it stayed at 1.75A
02:40 evil_dan2wik Your motor probably just settled down a little.
02:40 defaultro ok
02:40 evil_dan2wik defaultro, So its not drawing 2A continuous from the batteries, Which means you will probably be able to get more than twice the ammount of time from the battery.
02:41 evil_dan2wik What is the camera being powered by?
02:41 defaultro yeah, I noticed 1,75 will go down to like 0.98 then goes back to 1.75
02:41 defaultro it's own battery
02:41 evil_dan2wik Will it last the 4 hours?
02:41 defaultro no, that's my problem right now
02:41 defaultro I can buy a battery pack though
02:41 defaultro it can have 3 batteries
02:41 defaultro one battery can last 2.5-3.5 hrs
02:42 defaultro to times 3 that
02:42 evil_dan2wik heh ok.
02:42 defaultro :D
02:42 defaultro i haven't bought one yet
02:42 defaultro the camera is triggered with 4n35
02:42 defaultro camera's shutter
02:43 evil_dan2wik To cut down on power, Try to turn the screen off on the camera.
02:43 defaultro yup, i do that :)
02:43 defaultro during winter, it only last like 2 hrs
02:43 GuShh_ it doesn't turn itself off?
02:43 evil_dan2wik hmm?
02:44 defaultro the camera slider was still moving even the camera died, lol
02:44 GuShh_ you can sometimes tape the sensor used to detect if your face is near the camera (which is used to turn the screen off on reflex)
02:44 evil_dan2wik You can easily power the camera from an external source. Like the battery that the motor will run off.
02:44 defaultro cool
02:45 defaultro it's always teh camera's battery that dies earlier
02:45 GuShh_ defaultro: disregard what evil_dan2wik is saying about your camera, simply because you could end up frying it at this stage, you need to understand a few more basics first
02:45 GuShh_ unless you don't mind
02:45 defaultro sure
02:45 GuShh_ if you can charge it from usb though you can rather easily cook something up
02:45 evil_dan2wik My camera can be powered by a usb port. If you use a regulator to get 5v, you can run the camera.
02:46 defaultro mine doesnt have a usb
02:46 GuShh_ evil_dan2wik: he's just starting out, I'd hate to see him fry the camera due to lack of information
02:46 GuShh_ aux power input somewhere?
02:46 defaultro i don';t think so
02:46 defaultro it's a Canon 50D DSLR
02:46 GuShh_ model
02:46 defaultro i think it's a 2009 model
02:47 evil_dan2wik How do you charge the battery?
02:47 GuShh_ meh they were good cameras
02:47 evil_dan2wik External charger?
02:47 defaultro i have an external battery charger
02:47 GuShh_ you can add a grip battery if you need
02:47 defaultro exactly, that's what I mentioned earlier
02:47 defaultro i just forgot the term :)
02:47 GuShh_ evil_dan2wik: unlike consumer cameras, DSLRs are different beasts in general.
02:47 defaultro it's called grip
02:48 GuShh_ yeah battery grip, sadly it makes the bulk bulkier.
02:48 evil_dan2wik GuShh_, Mine was a DSLR
02:48 defaultro I love this camera
02:48 GuShh_ was being the keyword
02:48 GuShh_ >_<
02:48 defaultro mine is a DSLR pro-amateur
02:48 defaultro i would love to upgrade to 5D in the future
02:48 zap0 defaultro, do you have the Magic Lantern hack?
02:48 GuShh_ there's always going to be something better than what you have, don't stress over it
02:48 defaultro I do but I am not using it
02:49 defaultro it's got it's builtin intervalometer. I built my own
02:49 evil_dan2wik My camera fried itself when someone jammed a shorted SD card in it.
02:49 defaultro wow, ouch :(
02:49 zap0 the 50D has a CF card right?
02:49 evil_dan2wik No idea how the managed to get metal shavings in the case, But they did.
02:49 defaultro I've learned so many things on my 50D
02:50 defaultro i am a heavy on photoshop
02:50 GuShh_ then you didn't learn much :p
02:50 defaultro i want to make things unusual :D
02:50 GuShh_ I'd like a full body but meh
02:50 defaultro that's all my budget can buy
02:50 evil_dan2wik Full body nude.
02:51 Shh_ s
02:51 GuShh_ defaultro: yeah they are not cheap
02:51 defaultro lol
02:51 zap0 full frame?
02:51 defaultro $3k-$5k
02:51 GuShh_ higher
02:51 defaultro especially the hassleblad
02:51 zap0 is 50D just APS-C ?
02:51 defaultro $40k
02:51 defaultro yes
02:51 defaultro aps-c only
02:52 GuShh_ zap0: full frame reffers to the frame / sensor size (35mm)
02:52 defaultro i think shutter count is close to 60k, lol
02:52 GuShh_ wow
02:52 GuShh_ never serviced it?
02:52 defaultro no
02:52 defaultro it's because i've been doing a lot of timelapse
02:52 GuShh_ the used ones around here have at most 25k I thin
02:52 GuShh_ think
02:52 GuShh_ and have already been serviced
02:52 defaultro i think i should
02:53 GuShh_ I don't know what's the expected life on that shutter
02:53 defaultro I noticed some color issue
02:53 defaultro i was told in dpreview it's 200k
02:53 defaultro but i'm already noticing some hue issues
02:53 GuShh_ that's more than I thought
02:53 defaultro just minor
02:53 defaultro that's why i've been shooting RAW
02:54 defaultro i was also told that sensor aren't that expensive
02:54 defaultro it's got 3 dead pixels :D
02:54 GuShh_ meh
02:55 evil_dan2wik Just merge those pixels with the surrounding pixels.
02:55 zap0 are they next to each other?
02:55 GuShh_ the firmware should already be doing that, or have an option for it
02:55 GuShh_ zap0: I'd like a D800E or similar...
02:55 defaultro i tried but it didn't fix it
02:56 zap0 d800... oohh.. $3k+
02:56 defaultro zap0: I can post process it to remove the dead pixel. It's always at the same location
02:56 GuShh_ yeah just the body except in argentina it's 6k
02:56 GuShh_ everything is at least twice.
02:56 defaultro i saw my officemate's nikon, it's got an intervalmoter
02:56 zap0 ouch!
02:56 zap0 import from ebay
02:57 defaultro we can't go wrong with either Nikon or Canon
02:57 GuShh_ 50% tax plus other nonsense
02:57 GuShh_ there's no good reason one of these bodies can't last you over a decade, except for the batteries
02:58 GuShh_ or your own personal whims
02:58 defaultro yup
02:59 defaultro i'm actually tempted to buy the Canon 40Ds in Craigslist. These cameras are really good
02:59 GuShh_ we are currently devaluated about 10 to 1 vs usd currency
02:59 GuShh_ oficially about 6 to 1
02:59 defaultro k
02:59 defaultro oh no, it's close to 3am, lol
02:59 GuShh_ with prices increasing 10% monthly on everything
02:59 GuShh_ either people are stupid or blind about it
02:59 defaultro :)
03:00 defaultro alright folks, I'm hitting the bed soon
03:00 defaultro thanks for helping me troubleshoot
03:00 defaultro :)
03:00 zap0 a 40D must be cheap now days
03:01 defaultro it;s $200+
10:45 rue_bed zap0, the usd is gonna collapse, the ripple will be interesting
10:46 zap0 good. about time.
10:46 theBear you mean collapse again
10:46 robotustra hope
10:46 robotustra they will print new
10:47 robotustra senseless talks about $$$
10:51 rue_house do you understand that the usa has borrowed more money than it can pay interest for?
10:51 rue_house LOTS more
10:51 rue_house curious to where the interest rate comes from tho
10:52 theBear just gotta stop buying bullets and invading countries
10:52 theBear and occupying, that'll have to stop too
10:53 rue_house it seems they cant pay their military forever
10:53 rue_house I'm guessing if they cant pay soldiers, they will, for the most part, disband
10:53 theBear the whole problem is cos of those 3 things
10:53 theBear cost
10:53 theBear no cos
10:53 theBear either word
11:01 uehuehue theBear, Which country should the US liberate next?
11:02 rue_house its gonna have to liberate itself from china
11:02 rue_house who is gonna claim it as the usa defaults
11:03 theBear i never said liberate
11:03 theBear that's THEIR word
11:03 rue_house sold the country to cheap labour
11:03 uehuehue That was a joke ;)
11:03 zap0 make most of what wall street does criminal.
11:03 zap0 problems will quickly get fixed.
11:05 zap0 make advertising lies illegal.
11:06 theBear they are illegal here, but there's illegal and there's illegal
11:09 robotustra http://habrahabr.ru/post/184444/
11:09 robotustra Venus
11:09 robotustra 1975 year
11:09 robotustra USSR
11:10 robotustra http://mentallandscape.com/V_Venus.htm
15:53 defaultro hey guys, what could be few reasons why my regulator 7805 is heating up so much?
15:57 ace4016 yes
15:57 ace4016 you're drawing enough current to require a heat sink typically
15:57 ace4016 or you got your pin setup incorrectely
15:57 ace4016 (that includes accidentally shorting to ground)
16:03 defaultro ok
16:03 defaultro the wiring are correct
16:03 defaultro wirings
16:03 defaultro i'll check the ground
16:17 defaultro ace4016: I don't see any wrong wiring. It's also able to power the display properly at 5v. Let me draw the connection of the regulator
16:18 ace4016 do you know what your current draw is? i believe after 200ma you need a heat sink
16:22 evil_dan2wik defaultro, What are you drawing?
16:23 defaultro the one we troubleshooted last night, the regulator
16:23 defaultro i was wondering why it's heating up so much
16:23 evil_dan2wik If its still the 1.75 A, You need a heat sink.
16:23 defaultro oh ok
16:24 defaultro that could be it then
16:24 evil_dan2wik That is it.
16:24 ace4016 ...
16:24 ace4016 you mean like i said :P
16:24 defaultro so maybe last night, I was only paying attention to the regulator on the UNO board
16:24 defaultro I didn't pay attention to the L7805 I installed
16:25 ace4016 7805, in the data sheet says if you draw more than 200ma, put a heat sink on it, then it can handle approximately 2A
16:25 evil_dan2wik The one on the UNO is more precious since it is apart of your UNO.
16:25 defaultro got it
16:25 ace4016 after that, get a bigger linear regulator
16:25 defaultro to replace the 7805?
16:26 ace4016 lol, no no
16:26 ace4016 if you go over 2A, you can't really use a 7805
16:26 defaultro which one? ;)
16:26 defaultro what should be used then?
16:27 ace4016 i don't know linear regularots by heart apart from the 7800 series
16:27 evil_dan2wik A bigger regulator, Search around.
16:27 ace4016 but yea, bigger regulator
16:27 defaultro i think if I put a heatsink, it will help but I'm still maxing it out since i am drawing 1.75-2A
16:27 ace4016 at 1.75-2A you should be good with a sufficient heat sink
16:27 evil_dan2wik defaultro, You still have those caps right?
16:27 defaultro yes, i still have caps
16:28 defaultro i thought it was the culprit so I put 100uF 50v
16:28 evil_dan2wik Are they installed agaiN?
16:28 defaultro yes, they are
16:28 evil_dan2wik ok.
16:28 defaultro should I remove it?
16:28 evil_dan2wik No.
16:28 GargantuaSauce_ what are you drawing 2A with?
16:28 evil_dan2wik Stepper motor
16:28 GargantuaSauce_ that shouldn't be supplied through a linear regulator
16:28 defaultro honestly, it's not stepper motor that is connected to the 7805, just the vfd
16:28 evil_dan2wik He is doing quite a nice project.
16:28 GargantuaSauce_ so you are not drawing 2A through the linear regulator
16:29 defaultro no, only vfd
16:29 GargantuaSauce_ what is the rated current draw of the vfd?
16:29 defaultro let me research
16:29 defaultro it's a vfd 7003
16:29 evil_dan2wik He has no current limiting on the vfd.
16:29 defaultro one page datasheet, http://media.digikey.com/pdf/Data%20Sheets/Noritake%20PDFs/GU140x32F-7000.pdf
16:30 defaultro what table should I look at?
16:30 GargantuaSauce_ the one that ays current
16:30 ace4016 400mA
16:30 ace4016 you need a heat sink
16:30 defaultro 400mADC typ
16:31 defaultro that's 4A right
16:31 GargantuaSauce_ 0.4A
16:31 defaultro oh ok
16:31 GargantuaSauce_ still definitely enough to require a heatsink
16:31 defaultro yup
16:31 defaultro i bought another regulator yesterday which can support upto 50v
16:31 defaultro i think amp support is upto 7A
16:32 defaultro let me doublecheck
16:32 GargantuaSauce_ the 7805 is fine, you just need a heatsink on it
16:32 defaultro I bought this already, http://www.ebay.com/itm/180947008880?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
16:33 GargantuaSauce_ because it is cranking out (12-5=7V)*0.4A = 2.8W of heat constantly
16:33 defaultro oh only 2A
16:33 defaultro got it
16:33 defaultro I can remove some heatsink on some device that are collecting dust in the basement :)
16:33 evil_dan2wik defaultro, Where is this magical 2amps comming from then?
16:34 ItsAllMyFault 7800 is good for ONE amp, datasheet says "up to 1.5amps", even in a TO-3 can
16:34 defaultro evil_dan2wik: from the one i bought last night, http://www.ebay.com/itm/180947008880?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
16:34 ItsAllMyFault Pdiss = 1.5w no heatsink, 15w infinite hetsink
16:34 evil_dan2wik No, I mean the 1.75 current draw
16:34 defaultro 1.75 is when I used my multimeter setting at 10A
16:35 ItsAllMyFault datssheet says 30w with infinite heatsink, but in reality, you don't have those, and the part overheats
16:35 evil_dan2wik So, If it is rated for 0.4A, where is that rest of it coming from.
16:35 defaultro the 1.75 includes motor stepper running and vfd on and few leds
16:35 ace4016 another circuit
16:35 evil_dan2wik Oh ok,
16:35 defaultro also the UNO
16:35 evil_dan2wik UNO draws around 0.01A
16:36 defaultro k
16:36 ItsAllMyFault try LM123 , or LM138
16:36 defaultro if it's idle, only if vfd and led is on, the value I saw if I remember correctly was 0.77
16:37 defaultro i'll put a heatsink ItsAllMyFault
16:38 defaultro I'll remove the vfd and check if the 7805 will heat up. If it does, there might be some wrong wiring
16:40 ace4016 o.0
16:46 defaultro yup, connection are correct. The 7805 didn't heat up anymore. I'll put a heatsink
16:46 defaultro connections
16:55 defaultro I found two. Those should be good right? Was wondering why it was soldered the pcb. http://i.imgur.com/aYM8BHu.jpg
16:56 defaultro actually, it's not soldered :) there is just a metal pin that mount itself to it
16:57 GargantuaSauce_ that'll probably do, might be a little small but will be a vast improvement over the little integrated heatsink
16:57 defaultro k
16:57 GargantuaSauce_ rubbing alcohol will probably move the white thermal gunk
16:57 defaultro ok
16:58 defaultro what would be that 929 stuff
16:58 defaultro is it a regulator or transistor
17:02 GargantuaSauce_ the googles, they do more than nothing
17:03 defaultro I found different stuff :) its ok
17:03 defaultro heading to taydaelectronics to look for heatsinks
17:04 defaultro this is crap, they only sell this, http://www.taydaelectronics.com/hardware/heatsink/heatsink-to-220-4-fins-aluminium.html
17:04 defaultro will that work though?
17:04 GargantuaSauce_ should
17:06 defaultro it's the same height as to what I'm removing right now but looks that has more metal
17:51 defaultro the heatsink is getting warm. That means the connection I made with the regulator is good
20:21 defaultro hi folks, how do I heatsink this? http://i.ebayimg.com/t/New-LM2596HV-LM2596S-DC-DC-Step-Down-CC-CV-Adjustable-Power-Supply-Module-/00/s/NjAwWDYwMA==/z/MBUAAMXQ5jdRyAtk/$(KGrHqR,!ngFBg15gO,hBRy!tkKqU!~~60_3.JPG
20:22 defaultro it said at 3A, there should be a heatsink
20:26 Triffid_Hunter defaultro: I have heaps of those, they won't do much more than 2A without a sink and even then they're pretty toasty
20:26 defaultro did you mean they aren't good?
20:26 Triffid_Hunter if you want to heatsink it instead of getting a bigger switcher, you need to scrape the solder mask off from behind the chip and solder a copper sink to the board.. gonna be a pretty tricky operation, may need a gas torch or at least hot air
20:27 Triffid_Hunter defaultro: actually they're fantastic, but don't expect more than 2A
20:27 defaultro right now, my stepper motor draws about 1.75A
20:28 defaultro what I did 10 mins ago is that I put an L7805 regulator so that my stepper motor is now being driven at 5v
20:28 defaultro my L7805 had a heatsink but it still became very hot
20:28 ItsAllMyFault Triffid_Hunter, for what?
20:29 Triffid_Hunter defaultro: yep that's to be expected, power = (Vin - Vout) * current with linear regs
20:29 defaultro I'm hoping that the buck converter I bought will be better than L7805
20:29 Triffid_Hunter defaultro: definitely it will
20:29 defaultro ok
20:29 defaultro I'm looking for something bigger since I will definitely upgrade my stepper motor
20:29 Triffid_Hunter I literally have a whole drawer full of those LM2596 modules
20:30 defaultro :)
20:30 sAllMyFault uses laptop psu because they exist, and can be cheaper than a Radio Shack power transfo
20:31 defaultro this is what I exactly bought last night as suggested by Gush
20:31 defaultro http://www.ebay.com/itm/180947008880?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
20:33 Triffid_Hunter defaultro: your stepper will take a lot less current at 5v than it does at 12
20:33 defaultro will the buck converter still work if input is now from a 12v battery?
20:33 Triffid_Hunter defaultro: get LM2596 datasheet, see for yourself
20:33 defaultro I noticed it was weaker
20:33 ItsAllMyFault he still has no current limiting?
20:33 defaultro ItsAllMyFault: can you help me build one?
20:34 defaultro I have the picture but I am still very confused to which wire it goes
20:35 defaultro can't find the pic :(
20:37 defaultro you're not familiar with cc?
20:39 evil_dan2wik defaultro, Google current limiting
20:40 defaultro evil_dan2wik: i found the pic - http://i.imgur.com/JyUuw05.png
20:40 defaultro i'm really confused about the 4 open wires
20:40 defaultro INPUT, VPLUS, LOAD PLUS and LOAD MINS
20:40 defaultro I can easily connect the transistors and resistors
20:41 defaultro but I am not sure how to connect it to my setup
20:41 evil_dan2wik Where did you find it?
20:46 defaultro sorry, my son was asking help
20:46 defaultro someone gave it to me 2 days ago
20:46 defaultro I was actually given a simpler one but can't find the image
20:47 defaultro this is one of it, http://designerthinking.com/images/IMG_2089.jpg
20:50 defaultro so ItsAllMyFault , how will cc driver work for my setup?
20:58 evil_dan2wik Sorry, I'm upgrading to windows 8.1
20:58 evil_dan2wik My computer froze for a while
20:59 defaultro oh it's ok :)
21:03 defaultro is this correct evil_dan2wik ? http://i.imgur.com/xwKEoic.jpg
21:03 defaultro I actually asked it the other day but never got a response, she gave up on me, lol
21:04 evil_dan2wik defaultro, What is it supposed to be>
21:04 evil_dan2wik ?
21:05 defaultro I forgot why she suggested this to me
21:05 defaultro maybe it's because my motor was heating up so much
21:05 defaultro i was asking how to prevent it from heating
21:05 evil_dan2wik Yes.
21:05 defaultro it will?
21:05 evil_dan2wik hmm?
21:06 defaultro and is my drawing right? I superimposed my lines on top of the image
21:06 evil_dan2wik I'm trying to read this, My resolution reverted to retarded
21:07 evil_dan2wik I'm not an expert on that but It should work.
21:07 defaultro so my connections are right?
21:08 evil_dan2wik I think so
21:08 defaultro k
21:08 defaultro so i watched a youtube about current limiter. The way the guy explained it is that it will try to prevent high current
21:09 Triffid_Hunter yeah that looks about right
21:09 defaultro glad I did
21:09 defaultro but i still feel it won't fix the warming of the motor
21:10 defaultro what I think will fix is lower the voltage that I drive the motor
21:10 Triffid_Hunter defaultro: the motor gets hot because of the current. if you control the current, you control the heat
21:10 defaultro I'm thinking this because when I use a 6v battery, the motor doesn't get hot. When I use my 12v ps, that's when motor gets hot. Most likely, this motor I have is max at 12v.
21:11 Triffid_Hunter defaultro: the voltage simply causes a specific current to flow in the windings. better to control the current directly
21:11 defaultro so are you saying that using cc driver, the voltage will be the same but the current will be lower?
21:12 evil_dan2wik defaultro, it should not heat up as much.
21:12 Triffid_Hunter defaultro: yeah that's the entire point. not only that, you get to choose the current that you're happy with and as long as there's enough volts available, any extra will just make your transistor hotter
21:12 defaultro oh ok
21:12 Triffid_Hunter defaultro: all good stepper drivers are constant current
21:12 defaultro k
21:13 defaultro so the one that was given to me, what will it produce?
21:13 Triffid_Hunter defaultro: depends on your sense resistor, I=V/R and V will be about 0.7v
21:14 defaultro k
21:14 defaultro I'm looking at the image again
21:14 evil_dan2wik NO
21:14 evil_dan2wik FUCK
21:14 defaultro ?
21:14 defaultro that was weird, hehehe
21:15 defaultro i actually got confused with the 0.7 ohms. Is that something I need to add?
21:15 Triffid_Hunter that's the sense resistor.. it converts current to voltage. the transistor then compares that voltage to the base and then decides to turn on more or less
21:16 defaultro I've never seen a resistor that has a value of 0.7
21:16 defaultro the lowest one I have is like 1ohms
21:16 defaultro ohm
21:16 Triffid_Hunter 0.68 is available
21:17 Triffid_Hunter do you have 6x 1 ohm resistors?
21:17 Triffid_Hunter can make an 0.66 with 2s3p arrangement
21:17 defaultro oh ok
21:17 defaultro i remember it should be parallel
21:19 defaultro another question Triffid_Hunter
21:20 defaultro I bought a buck converter. I am thinking of setting it at 8v and test whether it will prevent motor from heating up. Which route is better, using cc driver or this buck converter?
21:21 GargantuaSauce_ use one of those monolithic stepper drivers
21:21 GargantuaSauce_ it is hands down the best solution
21:24 Triffid_Hunter defaultro: if the motor is moving slowly, doesn't make much difference. when the motor speeds up, it makes an opposing voltage and you need constant current or it will get very weak very fast until it slows down again
21:31 defaultro sorry, i had to help my son. I'm back now
21:32 defaultro never heard of monolithic stepper drivers. Looking for it in google now
21:32 GargantuaSauce_ the ones you were looking at the other day, consisting of an IC on a board
21:33 defaultro GargantuaSauce_: I don't recall anymore, i've looked at so many pages :D
21:34 defaultro Triffid_Hunter: the way the stepper motor library was written is that even if the motor isn't moving, all coils are energized
21:35 Triffid_Hunter defaultro: yes of course, that's how all steppers work
21:35 Triffid_Hunter defaultro: if you turn the coils off, the shaft goes limp
21:35 GargantuaSauce_ http://www.pololu.com/product/2133 something like this
21:35 defaultro I actually like it because when it's energized, it's like it's braking
21:35 Triffid_Hunter defaultro: yep that's the whole point
21:35 defaultro oh the driver
21:36 defaultro Triffid_Hunter: and using Arduino's stepper library, I am able to lift the dolly at an angle 85 degrees
21:36 defaultro using my own code which doesn't do stop, it can't lift it
21:36 Triffid_Hunter "doesn't do stop" ?
21:36 defaultro after moving the motor, I don't energize the coil
21:37 Triffid_Hunter defaultro: well then it's gonna fall down of course
21:37 defaultro i can easily rotate the shaft
21:37 defaultro yes
21:37 defaultro with that, the motor doesn't heat up even for 18 hours
21:37 defaultro i've tried it
21:37 Triffid_Hunter well duh, it's turned off
21:37 Triffid_Hunter how can it get hot if you're not putting any power in?
21:38 defaultro unfortunately, I need the former which is to use Arduino's stepper library but heats up the motor badly. That's why I will try cc driver and/or the buck converter i bought
21:38 GargantuaSauce_ anyway a driver like the one i linked will do current limiting with pwm instead of a glorified heating element
21:38 defaultro ok
21:38 Triffid_Hunter GargantuaSauce_: that's for bipolar motors. he has unipolar
21:39 defaultro GargantuaSauce_: so what about the buck converter I bought, that will work I guess because my motor doesn't heat up at 6v
21:39 GargantuaSauce_ you can drive unipolar ones the same way as bipolar ones
21:39 GargantuaSauce_ as long as the two centre taps are separate which i believe is the case for this motor
21:39 Triffid_Hunter GargantuaSauce_: need twice the supply voltage because the coils are in series, or you lose half your torque by only using half the copper in the motor
21:40 GargantuaSauce_ good thing we have 12v available
21:40 GargantuaSauce_ (also you have it backwards)
21:40 GargantuaSauce_ nevermind, misparse
21:40 GargantuaSauce_ anyway it'd suit the application i believe
21:41 GargantuaSauce_ the buck converter would do as well i guess
21:41 defaultro GargantuaSauce_: which one is better approach though?
21:41 GargantuaSauce_ i would say the stepper driver
21:41 defaultro ok
21:42 defaultro i think what I showed the other day is Big Easy Driver which supports upto 30v 3A but kats told me it's weak. She suggested a chip
21:43 defaultro I think the chip is 4982 something, couldn't recall anymore
21:43 GargantuaSauce_ it's about the same and costs 60% more
21:43 defaultro which one cost more? The Big Easy Driver?
21:44 GargantuaSauce_ yes
21:44 defaultro and cost more than which one?
21:44 defaultro the pololu link you posted earlier?
21:44 GargantuaSauce_ yes
21:45 Triffid_Hunter those A4982s are great, but also designed for bipolar motors. they're very similar to DRV8825
21:45 defaultro ok. Do I need 4 of those since mine has 4 coils?
21:45 GargantuaSauce_ no
21:45 GargantuaSauce_ your motor has 6 leads right?
21:45 defaultro yes
21:45 GargantuaSauce_ k good
21:46 defaultro I just need one?
21:46 GargantuaSauce_ yup
21:46 defaultro thanks for the info Triffid_Hunter too
21:46 defaultro are there other things I need to buy to make this driver work?
21:47 GargantuaSauce_ i don't think so
21:47 GargantuaSauce_ read the documentation on that page and probably the datasheet though
21:47 defaultro btw, it says this "microstepping bipolar stepper motor driver."
21:47 defaultro mine is unipolar
21:47 GargantuaSauce_ >Four, six, and eight-wire stepper motors can be driven by the DRV8825 if they are properly connected;
21:48 defaultro k
21:48 evil_dan2wik Sorry, Back.
21:48 evil_dan2wik My computer blue screened
21:52 defaultro ok
21:56 evil_dan2wik Washing machine's main board caught fire.
21:57 evil_dan2wik Seems to still be working though.
21:57 GargantuaSauce_ you powered it on again after it caught fire?
21:57 evil_dan2wik GargantuaSauce_, I took it apart first.
21:57 evil_dan2wik A relay exploded
22:13 MrCurious happy Diwali