#garfield Logs

Oct 25 2015

00:00 rue_shop3 maybe I should make it its own board and shield it all
00:00 ^kat^ i think the sense should be at the utput jacks, so you don't miss wire drop or sense base/gate drive currents
00:00 rue_shop3 yup
00:00 rue_shop3 digital I sense after the analog meter and the digital v sense right at the terminals
00:01 rue_shop3 the analog v meter can be a few mV wrong :)
00:01 ^kat^ i had to build a 30amp 5v psu with the sense *at* the jacks because of the V-drop in the pcb traces
00:02 rue_shop3 yea, it would add up fast
00:02 ^kat^ 2oz copper, with solder over that
00:03 ^kat^ two 20,000ufd fiter caps
00:03 ^kat^ 2 MJ3055 in to-126 packages, driven by another MJ3055
00:03 rue_shop3 I have to design a LC filter for 250Khz @ 5A
00:03 ^kat^ that was like 1979
00:03 rue_shop3 dont know what I want my ripple to be
00:04 rue_shop3 the drive current on the 3055 is brutal
00:04 rue_shop3 only a 3055 can take it :)
00:04 ^kat^ why not buy a 120Vac-whateverVdc , and just servo it's Vsense line?
00:05 rue_shop3 it cant go to zero
00:05 ^kat^ o
00:05 rue_shop3 or do 10mA curent sourcing
00:05 ^kat^ you'd haveto do all the current sense and control yourself, yeas
00:06 rue_shop3 the idea is current limiting across 5A with 16 bits
00:06 rue_shop3 yea
00:06 rue_shop3 0-30V, again, 16 bits
00:06 rue_shop3 whch is sutupid, but so far I'm pulling it off
00:08 rue_shop3 yea, I'll bring the feedback into the regulator baord
00:10 rue_shop3 the dac output from 1.25 to 3.75V @ 16 bits, I wonder if I should have them on the regulator board to reduce noise
00:11 rue_shop3 otherwise I suppose short and shielded
00:13 ^kat^ ouch
00:13 rue_shop3 I wonder if I can keep the serial data out of the outputs
00:13 rue_shop3 _-_-_------__-_-_____--__---___
00:14 rue_shop3 #10 ground to a 2mA chip
00:14 ^kat^ that's 2.5v, or 0.00003814697265625 v per bit for 16bits ,, that's going to be an issue for your analog section
00:14 ^kat^ i mean per increment step
00:14 rue_shop3 yea, I wish I had a HV DAC
00:14 ^kat^ 38uv
00:15 rue_shop3 one that output 0-30V would be nice
00:15 rue_shop3 then agian, I came up with a regulator amp board that runs on just 5V
00:16 rue_shop3 trimming is going to be a pita too
00:16 rue_shop3 1.25V needs to = 0 @ output
00:16 rue_shop3 I'm thinking there will need to be some digtal compensation
00:20 rue_shop3 I suppose if the feedback is good, I could have it self-calibrate
00:20 ^kat^ only if you have a relay disconnect it from the output pins
00:20 rue_shop3 or a user activated calib
00:20 ^kat^ else it might wake up at full output before it cal's itself
00:21 rue_shop3 the bottom could be out by a bit
00:21 rue_shop3 trim a few counts off the bottom of the dac
00:23 ^kat^ i think i might use aothe dac, or float the +/- of the dac down, or use a dc offset between the dac and the output buffers
00:23 rue_shop3 the dac centres its output at 1/2 vcc aka 2.5V
00:23 rue_shop3 I cant find another affordable dac
00:24 rue_shop3 @ 10+ bits
00:24 ^kat^ ok, a current source pulling down to V- , enough to drop the 2.5v precisely to 0v
00:24 rue_shop3 I was playing with using the avrs pwm output, thru a filter, and back to an adc pin as a closed loop analog ouput
00:24 ^kat^ or,, whatever you want the numbers to be
00:24 rue_shop3 limited success
00:25 rue_shop3 hmm
00:25 ^kat^ why limited?
00:25 rue_shop3 the feedback loop thru the uC
00:25 rue_shop3 not an amazing responce
00:26 ^kat^ if you use a buffer opamp, you can pull the feedback resistor from the (-) to something negative instead of gnd, and the opamp output will be offset
00:26 rue_shop3 not going rail-rail makes some things better
00:26 rue_shop3 I ahve an op-amp circuit to expand the output to 0-5V, but then I start to run into rail-rail problems firther down
00:27 ^kat^ 2.5v across a 1k R is 2.5ma
00:29 rue_shop3 use a current source and a resistor as an inline voltage source
00:29 rue_shop3 its a trick I like
00:29 at^
00:29 rue_shop3 the 723 uses that trick in the power supply i have now
00:30 rue_shop3 I'd use the 723, but there are problem with the way the feedback works, and there is a quirk in the low current cutoff
00:30 ^kat^ i servo'd my tape deck dc from heads to output by returning the (-) to the Vsense at the output jacks
00:31 rue_shop3 ? tone on the tape?
00:31 ^kat^ usng metal tape, it was incredible
00:31 rue_shop3 hmm
00:31 rue_shop3 poly chome?
00:32 rue_shop3 or actual iron
00:32 ^kat^ as good or better than CD, but never got rid of the tape hiss, soon as the tape moved, got hiss
00:32 rue_shop3 hmm
00:32 ^kat^ the pricey stuff
00:32 ^kat^ but it was atl least flat from 50khz to below 7hz
00:32 rue_shop3 I used to gather up the cro2 tapes from the thrift stores
00:33 rue_shop3 type II?
00:33 rue_shop3 hmm it has indeed been a long time
00:33 ^kat^ i forget
00:33 rue_shop3 it occurs to me that I will never need that information again, ever
00:33 rue_shop3 :/
00:33 ^kat^ it was the best premium metal tape i could find
00:34 ^kat^ i replaced the opamps w ith highperformance units, gutted the feric dolby circuits, removed all the coupling caps in the whole unit
00:34 ^kat^ removed all the resistors in the signal flow too
00:34 ^kat^ some remained in the feedback and Dolby C
00:35 ^kat^ the 7hz was as loud as the 20hz as loud as the 60hz, etc
00:35 ^kat^ i could record high end i could not hear, cold only see on the oscope
00:36 rue_shop3 dolby C?
00:36 ^kat^ but, the tape hiss :-(
00:36 rue_shop3 C?
00:36 rue_shop3 c...
00:36 rue_shop3 huh
00:36 rue_shop3 I suppose thats obsolete now too...
00:36 ^kat^ https://duckduckgo.com/?q=%22Dolby+C%22
00:36 rue_shop3 so, completely dc coupled?
00:36 ^kat^ yeas
00:37 rue_shop3 I think the stuff I had only had B
00:37 at^ nods,, she disabled t
00:38 rue_shop3 I presume C was better than B?
00:38 ^kat^ much
00:38 ^kat^ didn't really help the metal, but sure helped the ferric and cheaper metals
00:38 rue_shop3 the idea of trying to live 20k years sure makes everything seem like a flash in the pan
00:39 at^ ag
00:39 rue_shop3 I'v not been alive long at all, and so much has changed, granted some of its groundwork, but geez
00:39 rue_shop3 makes me wonder how much of what I'm carrying is just luggage
00:40 ^kat^ i remember the late 1950's chevy with fins, my grandfather had a beeeeeeeeeeeeeeeutiful black one,,, cars made now are so different,, but still have rubber tires
00:41 rue_shop3 and internal combustion engines
00:41 ^kat^ i remember the radio had a speaker with an electromagnet in it that doubled as the psu choke
00:41 rue_shop3 with efficiencies now dictated by petrolium producers
00:41 rue_shop3 oo
00:41 ^kat^ i remeber it had 6v6 outputs
00:42 rue_shop3 I dont like my regulator cirucit,its using the amps as comparitors
00:42 ^kat^ i remember my mom laughing at me when i sugegsted cell service for phones in cars
00:43 rue_shop3 thats how you know its a good idea
00:43 rue_shop3 people laugh
00:43 rue_shop3 thats one of the things I'v learned
00:43 ^kat^ i got the size of the cb down to putting it inside the microphone
00:43 rue_shop3 oh damn, I still need new speakers for the shop
00:43 ^kat^ that was 1975-ish
00:44 ^kat^ new?!
00:44 rue_shop3 'new'
00:44 rue_shop3 maybe I should just make my own boxes
00:44 rue_shop3 get some MDF
00:44 rue_shop3 make an adjust able tuning tube and glue it when its in the right place
00:44 ^kat^ 1/4 plate steel fully weld it
00:45 rue_shop3 heh
00:45 rue_shop3 yea...
00:45 rue_shop3 I found a docuemnt a few days aho
00:45 rue_shop3 ago
00:46 rue_shop3 turn to page 49 of your popular electronics, april 1973.
00:46 rue_shop3 speaker audio path designs
00:46 ^kat^ it's upstairs, my braine went off 23 mn ago
00:47 rue_shop3 your one of the few people in the world I could expect to have it
00:47 ^kat^ i might
00:47 ^kat^ i have a few copies of it froom back then, and qst
00:48 ^kat^ my mom got rid of so much of my stuff, right after tellingme i cold store it at her place (just not inside)
00:48 ^kat^ i goto bed, gnites
00:49 rue_shop3 night
19:09 Tom_itx rue_house, cap n rotor make it work better?
20:09 ^kat^ "once you've read a dictionary, other books are just a remix"
20:44 rue_shop3 heh
20:44 rue_shop3 ht48c50
20:46 ^kat^ want elp before i delete it?
20:48 Tom_itx how many times in a lifetime does the meaning of a word change?
20:48 ^kat^ 3
20:49 ^kat^ the pronunciation changes at least once, the spelling maybe 1/3 of a time
20:50 at^ deltes the ELP off the server since no one answ
20:50 ^kat^ done
20:51 Tom_itx what elp?
20:51 Tom_itx i got the album if that's elp
20:51 ^kat^ a selection of their songs
20:51 Tom_itx i like them
20:51 Tom_itx brain salad surgery is what i got
20:51 Tom_itx want it?
20:52 ^kat^ one album? i got 23
20:52 Tom_itx just one
20:52 Tom_itx 23 all elp??
20:52 Tom_itx i didn't even know they had that many
20:53 ^kat^ rue, you might wanna rethink that being a robotplan, Marta Altesa is all biological, and a wonderful bass guitar player
20:53 Tom_itx i generally sit in silence anyway
20:53 ^kat^ Tom, then you need ear
20:53 ^kat^ buds/phones
20:53 Tom_itx got em
20:53 ^kat^ wth is why my sentenses being
20:53 ^kat^ split?
20:56 ^kat^ ???
20:56 ^kat^ http://imgur.com/gallery/DBpN8eM
20:59 Tom_itx heh
21:07 ^kat^ rue, another usa lawnmower : http://imgur.com/gallery/UruUpV9
22:01 ^kat^ Fatalities Reported After Tour Vessel Boat Carrying 27 Capsizes Off British Columbia
22:01 ^kat^ October 26th, 2015
22:04 ^kat^ About 100 people were injured on Sunday when a ferry returning from Macau to Hong Kong collided with an unknown object,
22:04 ^kat^ well, they didn't say how far off British Columbia
22:08 ^kat^ "Thre huge grete teeth in his throte...the voys of a serpente in suche wyse that by his swete songe he draweth to hym the peple and deuoureth them."
22:09 nuclearnadal helo
22:09 nuclearnadal anyone here
22:09 rue_house took 7 printer apart so far
22:09 ^kat^ no
22:09 nuclearnadal hey rue_house
22:09 nuclearnadal how are you?
22:09 rue_house hey whats up
22:10 rue_house I dont know, the odds are almost infantesimal
22:10 rue_house but for some reason I am
22:10 nuclearnadal nothing much, just trying to figure out that why the solder is not flowing, its giving me very hard time
22:10 nuclearnadal and costing me lot of
22:10 nuclearnadal $$
22:11 nuclearnadal rue_house: can you help me out in finding the cause of my problem?
22:12 rue_house I think the real question is how much longer WILL I be
22:12 rue_house your having a soldering problem?
22:12 rue_house what are you soldering?
22:12 rue_house (to what, with what)
22:12 nuclearnadal http://i.imgur.com/ZhGgnEE.jpg http://i.imgur.com/BGiRRCs.jpg http://i.imgur.com/1HrqRUv.jpg , why the solder look dried and wont melt easily? is the solder wire and flux knock off?
22:12 rue_house I'll be back, or so I suspect
22:13 ^kat^ 1) use tin-lead 2) use rosin
22:13 ^kat^ flux
22:13 ^kat^ there it goes
22:13 ^kat^ again
22:13 rue_house not enough heat I suspect
22:13 nuclearnadal i am using that only
22:13 nuclearnadal I tried different heat
22:13 rue_house use the 60/40
22:13 nuclearnadal still same
22:13 rue_house no, not enough heat as in not enough wattage
22:13 nuclearnadal I tried putting soldering wire just on the tip of soldering iron and it wont flow
22:14 rue_house looks like the iron was sticking to the connector
22:14 rue_house you need to use a 100/120W for just a second
22:14 rue_house lots of heat for a shorter amount of time
22:14 rue_house how many connector melted?
22:14 nuclearnadal i am trying to solder that micro usb port not to remove it
22:14 ^kat^ will a match melt the solder? maybe you have actual wire
22:15 nuclearnadal but the loose wire from the screenshot does melt and stick to soldering iron tip
22:15 nuclearnadal but those Kaisi and BAku doesnt
22:15 rue_house it actually dosn't look THAT bad... its not stuck?
22:16 rue_house realize they dip the things in solder, the finish is different
22:16 rue_house but a stronger iron
22:16 rue_house that iron is meant for small wires
22:17 nuclearnadal yeah, thats a factory job but my issue is that when I try to solder those small pins on the board then the solder wont flow and the pins wont get soldered :-S
22:17 rue_house none of those connectors melted when you were trying to work on them?
22:17 rue_house the small pins should solder fine
22:17 rue_house can you take a pic of the tip of your iron?
22:18 nuclearnadal i cant take now but I am 100% confident that the tip is nice and shiny and well tinned, I use Hakku tip cleaner
22:19 nuclearnadal I made sure that tip is good when the solder was not flowing
22:19 nuclearnadal I had this baku wire earlier but it was not flowing so I thought its the wire fault and then I ordered Kaisi wire but that one still does same
22:20 rue_house hakko
22:20 rue_house ye more heat as in wattage
22:20 rue_house a gun is better for the peices with metal plate on them
22:22 ^kat^ baku wire is stainless steel? you cannot solder to it
22:24 rue_house what is baku?
22:24 ^kat^ are these "solder wire" actual solder or actual wire?
22:24 ^kat^ and do they have flux in them?
22:24 rue_house just use the 60/40
22:24 ^kat^ rue, i think he is trying to melt stainless steel with the soldering iron
22:25 ^kat^ https://duckduckgo.com/?q=baku+wire
22:25 rue_house throw the bakku spool across the room and use the 60/40
22:25 rue_house just use the 60/40
22:25 rue_house just use the 60/40
22:25 rue_house just use the 60/40
22:25 rue_house just use the 60/40
22:25 rue_house just use the 60/40
22:25 rue_house just use the 60/40
22:25 rue_house nuclearnadal,
22:25 ^kat^ which is why i asked if a match wold melt it
22:25 e_house heates ea
22:26 rue_house hate it even
22:26 ^kat^ if it's stainless, it will just glow red hot
22:27 rue_house http://toolboom.com/en/Solder-BAKU-BK-10004.php
22:27 ^kat^ lay it across a high current battery, does it glow red hot?
22:27 rue_house seems to be the lead free crap
22:27 ^kat^ oh, then you need an 800F iron
22:28 ^kat^ 97% Sn , holycrap
22:29 rue_house welcome to the leading cause of failed solder joints in the world today
22:31 at^ imagines a pcb covered with all the legs of soic packages that have been burned away,, but the legs remain, and will never be unsold
22:46 ^kat^ The server timed out while waiting for the browser's request. <<== then how did the server know it was timed out if the browser didn't send the request?
23:11 rue_house hmmm
23:12 rue_house hmm pfm agc
23:13 ^kat^ o
23:23 ^kat^ see, if yo make a cylinder shape the dia of AA cells, with quad-grid-plate sections 1/2 inch tall, you can squeeze a vac tube 74374 into 2" tall space, you can squeeze many such gates into cylinders and slip into the wine bottle
23:23 ^kat^ and 1/2 tall is just the size of filaments from car tail lites
23:27 at^ ponders a 6502 buil
23:27 ^kat^ such a way
23:30 ^kat^ .....
23:33 rue_shop3 l
23:33 rue_shop3 can a person do a fet current mirror?
23:34 rue_shop3 your wire count out of that tube is going up
23:34 ^kat^ http://webpages.charter.net/dawill/tmoranwms/Elec_RSFlipFlop.gif
23:34 ^kat^ keep all the interconections inside, somehow
23:35 rue_shop3 I recall the micro tubes, tri...ode in a package smaller than a pen cap
23:36 ^kat^ i was thiking if one hot cathode (the bare filament) could be common for 4 trides, you'd have a flipflip
23:37 rue_shop3 http://tubes-store.com/images/sg202b_01.jpg
23:37 rue_shop3 those guys
23:37 ^kat^ else you'd be making the equivalent of 12ax7's, and need two of them, and that wold be silly
23:37 rue_shop3 yea but, my point is, SMALL!
23:37 ^kat^ i was trying to not buy them and not be sealing up so many tiny tubes
23:39 rue_shop3 http://diyaudioprojects.com/Tubes/6418-Tube-Phono-Preamp-Kit/sub-miniature-6418-pentode-tube-matching-circuit.png
23:39 ^kat^ Let�s call it a �classic� since it usually presented in many old electronic books without mentioning who the inventor is. The circuit is very simple, it consist of two transistors, two incandescent bulbs, two resistors, and two capacitors.
23:39 rue_shop3 yea I understand, I'm just fixed on how cute they are
23:39 ^kat^ http://www.deeptronic.com/wp-content/uploads/2014/01/classic-flip-flop-lamp-circuit.gif
23:39 rue_shop3 there is neon technology too
23:40 ^kat^ then look up nuvistors
23:43 rue_shop3 cool
23:43 rue_shop3 ooh, I dont want to go to sleep
23:43 rue_shop3 now
23:43 ^kat^ http://wikis.olin.edu/ca/lib/exe/fetch.php?w=640&tok=5fe2cc&media=2014:eniacsrlatch.png
23:44 ^kat^ http://wikis.olin.edu/ca/lib/exe/fetch.php?w=840&tok=da9d11&media=2014:srlatch.png
23:44 rue_shop3 http://www.bowdenshobbycircuits.info/neon.gif
23:46 ^kat^ http://wikis.olin.edu/ca/lib/exe/fetch.php?w=840&tok=fb9c8c&media=2014:img_4257b.jpg
23:46 rue_shop3 http://www.next.gr/uploads/88/dance.jpg
23:47 rue_shop3 but in the links I did the neon is the active component
23:47 ^kat^ yeas
23:47 e_shop3 looks around the room, place looks like there was a URL wa
23:47 rue_shop3 :)
23:48 rue_shop3 ok I have the next schematic to test for the power supply
23:49 at^ orders an url cle
23:49 e_shop3 sets loose a robot to gather the
23:49 rue_shop3 ARG, it gathered copies it made...
23:50 ^kat^ i wonder if a spring cou
23:50 ^kat^ ld be a grid in a triode
23:50 ^kat^ damnit
23:50 ^kat^ something wrong in my mirc tonite
23:50 rue_shop3 only the cathode material is important isn't it?
23:50 rue_shop3 the grid and the plate can be anything?
23:50 ^kat^ only that it emit electrons
23:51 ^kat^ it hasto be HOT
23:51 rue_shop3 I hear zinc is good for that
23:51 ^kat^ if it's a indirectly heated cathode (it's not the filament), then extra electon emitters are often used
23:52 ^kat^ the bare cathode is good enough for digital circuits, specially if they are all connected together anyhow
23:52 ^kat^ prolly thelowest filament voltage possible
23:52 ^kat^ and dc
23:53 rue_shop3 how does a camera tube work, anode current = light level?
23:54 ^kat^ arg, i don't remember how a regular camera works!
23:54 ^kat^ i know how a scillinication detector works
23:55 ^kat^ https://en.wikipedia.org/wiki/Video_camera_tube i have a couple of them
23:55 rue_shop3 I do to, but all the sony caps leaked
23:57 ^kat^ see how many different camera tubes they made, no wonder i happily forgot thema ll
23:57 rue_shop3 8 little lcds in a row
23:58 rue_shop3 what they are for, who could know
23:58 ^kat^ i do remember the crt in the 7104 can be used as a video camera to see what it just wrote
23:58 rue_shop3 from where they came
23:58 rue_shop3 was pretty lame
23:58 rue_shop3 a printer
23:59 rue_shop3 with a reputation for flame
23:59 rue_shop3 8 little lcds, sitting in a row
23:59 ^kat^ the mechanical systems used a common photodiode or capacitor
23:59 rue_shop3 which ones will get used,
23:59 rue_shop3 which ones will go.