#garfield Logs

Dec 31 2013

00:03 rue_house http://eds.dyndns.org/~ircjunk/images/chart2.png
00:03 rue_house that'll test the hysteresis in the control scripts
00:04 rue_house I wonder if the pullup resistors are ok
00:04 katsmeow-afk yipes, bad sensor?
00:05 katsmeow-afk wait, it's all bad, how can "boiler in" be below 0c ?
00:05 katsmeow-afk the water won't flow below zero
00:09 rue_shop3 boiler in is also bad, yes
00:09 rue_shop3 I just did a bus reset
00:09 rue_shop3 boiler in has been reading 0 for a month, what its showing there is what it would if it flipped into 'double resolution' mode
00:10 rue_shop3 NC5 is the temp outside, so were doing ok here
00:11 tsmeow-afk
00:25 rue_shop3 bus reset worked...
00:25 rue_shop3 I bet if I scoped those lines they would be a mess
00:39 katsmeow-afk did you? are they?
00:45 rue_shop3 no
00:46 rue_shop3 I'm not into dragging the scope out there
00:46 rue_shop3 not right now
00:46 katsmeow-afk the lil portable one?
00:47 rue_shop3 na
00:51 katsmeow-afk "The Bank�s night drop receptacles may not be used to deliver or deposit checks, money, payments and other items."
00:51 rue_shop3 must be for safebox records
00:52 rue_shop3 I know a lot of companies have documents they use dropboxes to store
00:52 katsmeow-afk and other items."
00:53 katsmeow-afk *everything* falls under "otehr tiems", unless you are yelling ito one like it's a phone, which i'm sure it will ignore anyhow
00:57 katsmeow-afk The LM1084 is a series of low dropout voltage positive
00:57 katsmeow-afk regulators with a maximum dropout of 1.5V at 5A of load
00:57 katsmeow-afk current. It has the same pin-out as National Semiconductor�s
00:57 katsmeow-afk industry standard LM317.
00:57 katsmeow-afk The LM1084 is available in an adjustable version,
01:04 katsmeow-afk 78L05 dropout is 1.7v , 78xx is 2.5v
01:35 katsmeow-afk 10P LM1084 LM1084IT-ADJ Adjustable 5A Voltage Regulator
01:35 katsmeow-afk Item: 360380082433
01:35 katsmeow-afk From China
01:35 katsmeow-afk $3.80
01:35 katsmeow-afk Was: $4.00
01:35 katsmeow-afk Free shipping
01:35 katsmeow-afk 20pcs = $7.60
01:36 katsmeow-afk 50 pcs = $23.50
01:36 katsmeow-afk cheaper to buy 20 @ $7.60 = 38 cents each
01:37 rue_shop3 what about LM1117
01:37 katsmeow-afk 100 = $37.60
01:37 katsmeow-afk the specs or the price?
01:38 katsmeow-afk LM1117 = 800ma ?
01:39 katsmeow-afk The LM1117 is a series of low dropout voltage regulators
01:39 katsmeow-afk with a dropout of 1.2V at 800mA of load current.
01:39 rue_shop3 ...oh
01:40 katsmeow-afk 10 pcs AMS1117-3.3v fixed 99 cents free s&h, no bids : 99 cents
01:40 katsmeow-afk 10 pcs AMS1117-3.3v fixed 99 cents free s&h, buy now: $1.21
01:41 katsmeow-afk 20 pcs AMS1117-1.2v fixed free s&h, buy now: $3.74
01:42 katsmeow-afk 50 pcs AMS1117-1.2v fixed free s&h, buy now: $4.29
01:42 katsmeow-afk 50 pcs AMS1117 ,3.3v or 5.0 fixed : free s&h, buy now: $3.99
01:44 katsmeow-afk 20 LM7805 = $3.05
01:45 katsmeow-afk 50 pcs TL431 to-92 $1.69 free s&h
02:04 rue_shop3 431 is the programmable current soruce?
02:04 tsmeow-afk points out that if you pull up the base of a 2n3055 with a 7815, you can pull 10amps at 14v from the 3055 emitter before the 7815 will go into current limit at ~1amp,, it's a cheap way to make the 2N3055 a short-proofed psu pass transi
02:04 katsmeow-afk yeas
02:05 katsmeow-afk you can program it to deliver 10ma thru a 1k resistor and that makes 10v
02:06 katsmeow-afk or make it 10ma and switch reistsors with a 4051 or 4066
02:06 katsmeow-afk the ref pin uses microamps, it makes a pretty strong audio transistsor
02:08 katsmeow-afk gotcha, the gain of the 3055 (or tip35) will set the max current, so will the temperature
02:09 katsmeow-afk but the 2n3055 will take 5amps on it's base, so a 78xx won't blow the base, and the gain is so bad that chances are you cannot suck more than 10amps out of it with only 1 amp of base drive
02:11 tsmeow-afk wonders if tonite she can get to sleep before
02:11 katsmeow-afk gonna go try
02:24 rue_shop3 do you remember the name of the ham radio channel
02:58 rue_shop3 katsmeow-afk, whats the best you can find for a IRFL or otherwise logic level fet?
04:18 katsmeow-afk IRFL4105TR= [!what][!electronics][!device][!mosfet] MOSFET N-CH 55V 3.7A SOT223 ; HEXFET International Rectifier ; MOSFET N-Channel, Metal Oxide ; Logic Level Gate ; 45 mOhm @ 3.7A, 10V ; 55V ; 3.7A ; 4V @ 250uA ; 35nC @ 10V ; 660pF @ 25V ; 1W ; Surface Mount
04:19 katsmeow-afk IRFP3077PBF= [!what][!electronics][!device][!mosfet] MOSFET N-CH 75V 120A TO-247AC ; HEXFET International Rectifier ; MOSFET N-Channel, Metal Oxide ; Logic Level Gate ; 3.3 mOhm @ 75A, 10V ; 75V ; 120A ; 4V @ 250uA ; 220nC @ 10V ; 9400pF @ 50V ; 340W ; Through Hole
04:22 katsmeow-afk IRFP3077 : good for an amp at 3Vgs , 10amps @ 3.9Vgs
04:24 katsmeow-afk there's *1* on ebay : $8.82 + $4.94
04:25 katsmeow-afk IRFP4110PBF= [!what][!electronics][!device][!mosfet] MOSFET N-CH 100V 120A TO-247AC ; HEXFET International Rectifier ; MOSFET N-Channel, Metal Oxide ; Logic Level Gate ; 4.5 mOhm @ 75A, 10V ; 100V ; 120A ; 4V @ 250uA ; 210nC @ 10V ; 9620pF @ 50V ; 370W ; Through Hole
04:27 katsmeow-afk IRFP4110 is a lot like the IRFP3077 , but $9 on ebay from china
04:27 katsmeow-afk IRFP4368PBF= [!what][!electronics][!device][!mosfet] MOSFET N-CH 75V 195A TO-247AC ; HEXFET International Rectifier ; MOSFET N-Channel, Metal Oxide ; Logic Level Gate ; 1.85 mOhm @ 195A, 10V ; 75V ; 195A ; 4V @ 250uA ; 570nC @ 10V ; 19230pF @ 50V ; 520W ; Through Hole
04:30 katsmeow-afk IRFP4368 is $3.45 + $4 from china on ebay , needs 4.3Vgs to pass 10amps
04:31 katsmeow-afk IRFP4410ZPBF= [!what][!electronics][!device][!mosfet] MOSFET N-CH 100V 97A TO-247AC ; HEXFET International Rectifier ; MOSFET N-Channel, Metal Oxide ; Logic Level Gate ; 9 mOhm @ 58A, 10V ; 100V ; 97A ; 4V @ 150uA ; 120nC @ 10V ; 4820pF @ 50V ; 230W ; Through Hole
04:31 katsmeow-afk $11 from china
04:33 katsmeow-afk IRFR3607PBF= [!what][!electronics][!device][!mosfet] MOSFET N-CH 75V 80A DPAK ; HEXFET International Rectifier ; MOSFET N-Channel, Metal Oxide ; Logic Level Gate ; 9 mOhm @ 46A, 10V ; 75V ; 80A ; 4V @ 100uA ; 84nC @ 10V ; 3070pF @ 50V ; 140W ; Surface Mount
04:34 katsmeow-afk they all look like they will be pricey, because of the large die to get low Vgs and low Ron
04:35 katsmeow-afk Tiggr has many more listed, but i expect they will cost more than you want to pay
04:36 katsmeow-afk i suggest you make a psu that's 10v more than your Vcc, hang some pnp bipolars up there so when you pull their base down their collectors will pull the cheaper IRFZ44 mosfets gates up
04:37 katsmeow-afk you can discharge the gates (pull them down) with any ole npn with grounded emitter
04:39 katsmeow-afk 10 pcs IRFZ44 are $3.39 free s&h on ebay, IRFZ44= [!what][!electronics][!device] Material:N-chan ; Use:med pwr ; Device:MOSFET ; Vceo:55V ; Current:49A ; Ron:17mohms ; PwrDis:94W ; Case:TO-220
04:40 katsmeow-afk 50Pcs IRFZ44N IRFZ44 N-Channel 49A 55V Transistor MOSFET
04:40 katsmeow-afk Item: 130806048727 ; From China ; $14.18 Buy It Now Free shipping
04:41 katsmeow-afk 20 pcs TIP127 pnp to pull them up with : $6 free s&h
04:42 katsmeow-afk 50 pcs TIP127 pnp to pull them up with : $10 free s&h
04:42 katsmeow-afk and the 127 is a darlington, you won't need much to turn them on, those 74F07's will do it if the volts aren't too high
04:44 katsmeow-afk 100 pcs TIP127 $16 free s&h hong kong
04:45 katsmeow-afk TIP127= [!what][!electronics][!device] Material:PNP Si ; Use:med pwr ; Device:darl. ; Vceo:100V ; Current:5A ; PwrDis:65W ; Gain:1,000- ; Case:TO-220
04:48 tsmeow-afk hopes she didn't waste her time researcing this for rue, and that he read
04:51 rue_bed its the logic level fets I'm after, cant find them for a good price on ebay
04:51 katsmeow-afk me either, prolly for the great reason i said
04:51 rue_bed hmm
04:51 katsmeow-afk why can't you use a voltage gain buffer tweent he logic and the fet?
04:51 rue_bed 50pcs for $10 tho...
04:51 rue_bed didn't want ot have to extra stuff in there
04:52 katsmeow-afk yeas, the combo of the cheap fet and the cheap bippolar beats the snot outa buying logic levels at $8 a pop
04:52 katsmeow-afk are you just using them as grounded emitetr and pull-downs?
04:55 katsmeow-afk if you are, i'd still use the irfz44's, drive them with a pnp-npn pair, tie the bipolar bases together, and drive those bases with a 74F07 and a pullup R to +12
04:56 katsmeow-afk if all you need is 20ma of gate drive, use almost any ole quad opamp/comparator tween 12v and gnd, drive the gate directly
05:05 katsmeow-afk woah,, 20,000 1n4004 $30
05:07 katsmeow-afk was that 13.5Mhz xtals you needed?
05:11 rue_bed no I got resonaotrs, 32.768Khz and 32.000Khz
06:33 katsmeow-afk http://www.byterunner.com/byterunner/category=USB+to+Parallel+Adapters
06:47 katsmeow-afk http://www.byterunner.com/byterunner/category=USB+to+Single+Serial+Adapters/exact_match=exact
06:49 katsmeow-afk http://dx.com/p/itasee-it25-usb-2-0-male-to-parallel-db25-male-converter-adapter-cable-white-blue-125cm-258653
06:50 katsmeow-afk Port207V Cortex-M3 STM32F207VCT6 Development Board - Blue
06:50 katsmeow-afk - Model: Port207V - Quantity: 1 - Color: Blue - Material: Semi glass fiber board FR4 - Chipset: STM32F207VCT6 - Core: Cortex-M3 32-bit RISC - Working frequency: 120MHz
06:50 katsmeow-afk $28
07:04 katsmeow-afk Tomorrow will be 0m 32s longer.
16:01 rue_shop3 32s!?
17:15 rue_house I hoep you know $8 is waaay too much for a usb to serial adapter
17:16 rue_house and that you cant bit-control a parallel interface on the end of a usb adapter
17:16 rue_house (so it seems)
17:19 katsmeow-afk i know nothing of the sort, no one has told me
17:20 rue_house http://www.ebay.ca/itm/USB-to-TTL-Serial-Cable-Adapter-PC-PL2303HX-Chipset-USB-Cable-Computer-FT232-T7-/131053679818?pt=LH_DefaultDomain_0&hash=item1e836874ca
17:20 rue_house ^^ from the microcontroller you dont need to boost it up to rs232 to get it to usb
17:37 katsmeow-afk that's a bare cable
17:38 katsmeow-afk there is nothing to tell the puter how to talk to it
17:39 katsmeow-afk i have bare mouse and keybd cables
18:40 rue_house do we get a new years notice every hour for 24 hours?
18:42 Tom_itx something like that
19:39 Tom_itx bad joke
19:39 Tom_itx what does a baby computer call it's father?
19:40 Tom_itx data (dada)
19:54 Lola8088 Happy New Year Iceland!
19:54 Lola8088 if I could move anywhere... it'd be Iceland.
19:56 Tom_itx too damn cold
19:56 Tom_itx oh wait...
19:56 Lola8088 no way... it's a volcano.
19:56 Tom_itx you're from canadiaaa anyway
19:56 Lola8088 A VOLCANO!
19:57 Lola8088 Secret lair paradise.
20:09 rue_shop3 hey
20:10 rue_shop3 !! I just found a mosfet with a RDSon of __3 OHMS___
20:10 rue_shop3 WTF!?!?!
20:16 rue_shop3 hmm 2.5A, I'd bet I could use a P channel and still get away with it
20:39 rue_shop3 right, ok, so with 5V on the gate of one of the best fets i have, 60N06, VDS = 0.7V
20:39 rue_shop3 pretty sure I have a darlington that can beat that
20:42 katsmeow-afk no
20:43 rue_shop3 no?
20:43 rue_shop3 for 3A?
20:43 katsmeow-afk can't saturate a darlington's pass transistor
20:44 katsmeow-afk but you can get a transistor below .7Vce
20:44 rue_shop3 think I can find a expidital maybe?
20:44 katsmeow-afk who?
20:44 rue_shop3 I should be able to get to about .3V idealy
20:44 katsmeow-afk i gave you some numbers the other day
20:45 rue_shop3 yea, but I'm working with what I have
20:46 rue_shop3 mje13004
20:46 rue_shop3 'k758' which I think is 2sk?
20:46 katsmeow-afk you are doing it more than once, right? just make a pullup to 10v
20:46 rue_shop3 no just once
20:48 rue_shop3 mje13004 is 1V VCEsat
20:52 katsmeow-afk high voltage ones are usually high Vce
20:52 katsmeow-afk Debbie Harry is 68 and is on tv atm singing
20:52 rue_shop3 2sk758 is a fet...
20:55 katsmeow-afk 2SK758= [!what][!electronics][!device] Material:N-chan ; Use:HV med pwr ; Device:MOSFET ; Vceo:250V ; Current:5A ; PwrDis:40W ; Case:TO-220F F220
21:13 rue_house it has a verry bipolar-ish part number
21:13 tsmeow-afk
21:13 rue_house it was in the bipolar bin
21:14 rue_house I shoudl re-catalog all my transistors
21:15 katsmeow-afk use your robot arm and haveit ask Tiggr what bin it should go into
21:31 Tom_itx how does that projection keyboard they're advertising work?
21:33 rue_shop3 OH YEA 2sc4242 wins big time!
21:33 rue_shop3 I think
21:33 rue_shop3 at 4A, VCEsat is 0.8V
21:33 katsmeow-afk 2SC4242= [!what][!electronics][!device] Material:NPN Si ; Use:HV med pwr ; Device:trans. ; Vceo:400V ; Current:7A ; PwrDis:40W ; Gain:10- ; Case:TO-220
21:34 rue_shop3 well I suppose thats not better than the fet yes
21:34 rue_shop3 t
21:34 rue_shop3 one more to check out, 2sd1273
21:35 rue_shop3 no, 3A, with Vsat of 1
21:38 rue_shop3 er, nope, not the one I have anyhow, requires a crazy amount of base drive
21:39 rue_shop3 ok so I have to make a gate driver, sigh
22:05 katsmeow-afk sit the source down at -5 , so the gate is already up at 5v when it's at gnd?
22:11 rue_shop3 2 transistors and 5 resistors is about as much as can be fit in 1/4 square inch...
22:11 rue_shop3 but I did it
22:11 katsmeow-afk 2" tall by .25x.25 ?
22:12 rue_shop3 nope, the board is .5"x.5" (.5*.5 is .25) it'll be a PN2222's thickness wide
22:12 rue_shop3 made it as a sip4
22:12 rue_shop3 in, gate, +12, gnd
22:13 katsmeow-afk yeas, electronics is riddled with compromises, but it's a wonderful feeling to see a plan fall into place with a heavy crash and thud
22:17 rue_shop3 :( its 0.6x0.6
22:17 rue_shop3 oh well
22:17 rue_shop3 still have lots of scrap that will work
22:30 Tom_itx what fuel did/do you use for your aluminum forge?
22:31 Tom_itx or melting pot
22:31 rue_shop3 diesel
22:31 Tom_itx how do you introduce it to the flame?
22:31 rue_shop3 put a rag in there, soak and light it
22:31 Tom_itx like the old smudge pots?
22:31 Tom_itx or lanterns
22:31 rue_shop3 takes a few mins to get burning enough to keep er goin
22:31 rue_shop3 dunno
22:31 Tom_itx like a wick?
23:08 rue_shop3 just a rag on fire
23:08 rue_shop3 the main goal is that it stay on fire long enough for me to turn on the blower
23:12 rue_shop3 arg, the plotter is futzing up