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[00:00:05] <rue_shop5> I wonder how fast that comparitor will be switching the current off
[00:00:31] <katsmeow> it's funny that to use a power fet, you haveto jump thru hurdles to swing 10v across a big capacitance
[00:00:39] <rue_shop5> maybe I should do this upside down
[00:00:58] <rue_shop5> maybe the ...
[00:01:02] <rue_shop5> ok
[00:01:11] <rue_shop5> I have a center tapped coil in the motor
[00:01:16] <rue_shop5> mmmmmmmmm
[00:01:21] <rue_shop5> | | |
[00:01:30] <rue_shop5> hmm, missed, anyhow
[00:01:36] <rue_shop5> only one side is active at a time
[00:01:40] * katsmeow hangs a light bulb over rue's head
[00:01:50] <rue_shop5> the tap goes to +12V
[00:02:14] <katsmeow> ascii / ansi graphics require fixedsys font
[00:02:31] <rue_shop5> two transistors (the race of which will not be mentioned here) switch the two sides to the top of a 0.5 ohm current sense that in turn goes to ground
[00:02:41] <rue_shop5> mmmmmmmmmmmmmmmm
[00:02:48] <rue_shop5> | | |
[00:02:58] <rue_shop5> | +12V |
[00:03:06] <rue_shop5> | |
[00:03:18] <rue_shop5> Q1 Q2
[00:03:31] <rue_shop5> | |
[00:03:37] <rue_shop5> ---------------------
[00:03:40] <rue_shop5> R1
[00:03:43] <rue_shop5> GND
[00:03:59] <rue_shop5> the top of r1 is the current sense voltage
[00:04:14] <rue_shop5> its set for 0.7V, so I can use a diode as the vref of the comparitor
[00:04:38] <rue_shop5> Q1 and Q2 have two controls
[00:05:02] <rue_shop5> the phase input AND the comparitor have to be active to turn a coil on
[00:05:17] <rue_shop5> the comparitor is open collector output, the phase input is TTL
[00:06:03] <rue_shop5> how do I do this really simply
[00:06:33] <katsmeow> i dunno, you had a schematic of it 2 weeks ago
[00:06:54] <rue_shop5> accrding to the origional napkin-cad, the lm393 operates a npn (magically) that grounds out the fet gate, cause the fet has a pullup
[00:07:33] <rue_shop5> if I...
[00:07:58] <katsmeow> at 6ma, i think it can pull down under a volt
[00:08:36] <rue_shop5> against a 30mA gate pullup?
[00:08:51] <katsmeow> no
[00:09:33] <rue_shop5> I'v decided that pullup resistors may do, cause I dont want to put the 4 tl431 in
[00:09:33] <katsmeow> you seriously need to consider that scematic i made for you
[00:09:41] <rue_shop5> which one?
[00:10:20] <katsmeow> the one on the postit next to my tab key here
[00:10:50] <rue_shop5> ... did I ever see it?
[00:11:01] <katsmeow> pic i posted online, yeas
[00:11:26] <rue_shop5> was it a driver?
[00:11:37] <rue_shop5> this is just a unipolar driver for a stepper motor
[00:11:54] <katsmeow> drove the p-chan mosfet gate from a opamp/comparator
[00:13:16] <rue_shop5> "fill to overflowing" I cant, after I stop, it stops overflowing...
[00:13:33] <rue_shop5> ah, this is just N channel Z44's
[00:13:42] <rue_shop5> I have a bag of about 100 of them
[00:13:48] <rue_shop5> I dont know how that happened
[00:14:03] <katsmeow> good cheap fast n-chan fet
[00:14:24] <katsmeow> works for Q1 and Q2 , that's a grounded circuit anyhow
[00:16:18] <rue_shop5> oh I'm out of time
[00:16:20] <rue_shop5> :/
[00:16:33] <rue_shop5> didn't get a chance to put it togethor and see if it works
[00:17:40] <rue_shop5> there are 7 ouputs on a uln2003
[00:17:51] <katsmeow> yea, wierd
[00:17:56] <rue_shop5> if I have 6 transistors thats 18 pins
[00:18:05] <rue_shop5> if I use a uln2003 thats 14 pins?
[00:18:45] <rue_shop5> oh 16
[00:18:50] <rue_shop5> I'd save 2 pins
[00:19:14] <katsmeow> use tip42 and it would be indestructable
[00:19:37] <rue_shop5> for pulling fet gates down...
[00:19:56] <katsmeow> use tip147 and you could switcher a 1/4 hp motor at 48vdc
[00:20:10] <katsmeow> oh , right, the blasted fet gates
[00:20:29] <rue_shop5> well, I'm also trying to NOT order any parts to make this
[00:21:30] <rue_shop5> the design I'm playing with uses 4 pn2222 to pull down fet gates, and 2 pn2222 for controlling the current regulation limiting
[00:22:18] <rue_shop5> the breakthru was not using a logic gate block to combine the phase and current regulation signals
[00:22:56] <rue_shop5> I'm still high on chip count
[00:24:16] <rue_shop5> I got some atmega8 to do this with later, but, right now a tiny13 takes the clock/direction and generates the four phase signals, but sends them to a 74ls595 cause its kinda short a pin, and there is a LM393 pretending to be a switching current regulator
[00:24:38] <katsmeow> use a 2N7000 to pull the gate down? kinda cheap, 200ma
[00:24:57] <rue_shop5> other than that, its just the 4 power transistors and 6 signalling transisotrs
[00:25:01] <rue_shop5> .. and a 7805...
[00:25:17] <rue_shop5> I do have some 2n7000
[00:25:48] <rue_shop5> I'd like to use up the uln2003 cause I have the uln2803 which is MUCH more practical as its got 8 drivers
[00:26:24] <rue_shop5> and like I say, 6 transistors have 2 pins more than a uln2003
[00:26:30] <rue_shop5> means I'm saving space
[00:27:16] <katsmeow> k
[00:32:27] <rue_shop5> wtf is mct1413?
[00:32:47] <rue_shop5> darlington array
[00:32:49] <katsmeow> you know a ram module of 8 bytes was ~ 8x8x2 inches, and useto get so hot that once warmed up you could cook an egg on it? nowadays, 2 transistr legs doesn't seem like a huge penalty to a design
[00:33:11] <rue_shop5> how did they manage to ... tubes?
[00:33:25] <katsmeow> yeas
[00:33:47] <rue_shop5> too bad neon bulbs weren't made more realiable
[00:33:54] <rue_shop5> it could have been so much smaller
[00:34:07] <katsmeow> i once had to repair a decade counter, used 4 12AX7, indicators were NE2 , it was about 8x8x2 also
[00:34:28] <katsmeow> maybe 6x8x2
[00:34:45] <rue_shop5> two triodes used in flipflop?
[00:35:12] <rue_shop5> cascade divider?
[00:35:30] <katsmeow> one 12AX7 per flipflop
[00:35:37] <rue_shop5> yea
[00:35:44] <katsmeow> it's a dual triode
[00:35:46] <rue_shop5> 12AX7 is two tridoes, right
[00:36:10] <katsmeow> i thought i saw one of those int he woods a few yrs ago
[00:36:13] <rue_shop5> tridode: silicon hybrid tube :)
[00:37:00] <katsmeow> tehre is a triode-diode tube, and i think a dual tri plus diode
[00:37:12] <rue_shop5> so, mct1413 is just a uln2003 knockoff
[00:37:29] <katsmeow> there's a tridoe (or tetrode) sharing the cathode with two diode anodes
[00:43:30] <rue_shop5> hmm the board layout does not like this change
[00:43:41] <rue_shop5> serves me for changing the design after I started assembly
[00:44:16] <katsmeow> umm, yeas
[00:44:36] <katsmeow> pick one, build it, else none ever get finished
[00:45:01] <rue_shop5> I'm just trying to re-arrange everyone to suit
[00:45:31] <rue_shop5> the fets can be packed right up against each other face to back, the irfz44 is only switching 1.5A
[00:47:00] <katsmeow> http://DesignerThinking.com/images/DSCF6740mc.jpg
[00:47:26] <katsmeow> a month ago?
[00:49:53] <rue_shop5> ah yes
[00:50:43] <rue_shop5> this one shoudl be switching mode tho
[00:50:59] <rue_shop5> well, its bedtime for me
[00:51:18] <katsmeow> the opamp/comparator on the left does the wordk, the one ont he left allws for to set what voltage the left opamp switches around
[00:51:42] <katsmeow> circuit is good for far more than 12v
[00:52:01] <katsmeow> at 12v, you can switch the pnp direst witht eh opamps
[00:52:09] <rue_shop5> isn't one side votlage control and the other side current control?
[00:52:15] <katsmeow> praps with base resistors, not directly
[00:52:20] <katsmeow> no
[00:52:55] <katsmeow> "REF" is the ref to set the transistors at whatever you have the left opamp switching around
[00:53:31] <katsmeow> it's a fine 10ma current sourse too
[00:53:31] <katsmeow> and, you get 1 or 2 opamps in a dip-8 , so i chose 2
[18:59:45] <Tom_Lab> https://murdercube.com/files/
[18:59:49] <Tom_Lab> good stuff in there
[20:41:34] <rue_shop5> ok the current goes up about 1A in 100us
[21:06:15] <katsmeow> why can i https and irc and email, but not http?
[21:06:33] <katsmeow> it's as if the dns server is refusing http
[21:07:28] <rue_shop5> strange
[21:07:35] <rue_shop5> maybe you hit a quota?
[21:07:38] <rue_shop5> already
[21:07:52] <katsmeow> shouldn' be one
[21:08:01] <katsmeow> anyhow, this is the atart of a week and a month
[21:08:49] <rue_shop5> maybe they oopsed
[21:08:50] <katsmeow> i found 24 of these at the recycler :
https://www.vxb.com/6312-Bearing-Deep-Groove-6312-p/6312bearing.htm , if i return the shaft and housing, i get to keep the bearings for under $1 each
[21:09:06] <katsmeow> but there is not a quota limit
[21:09:18] <rue_shop5> nice
[21:09:57] <katsmeow> do modern elevators use belts to lift the car instaed of cables?
[21:10:04] <rue_shop5> no
[21:10:09] <rue_shop5> they use more cables than ever
[21:10:31] <rue_shop5> the large grey flat things are the wire cables
[21:10:38] <rue_shop5> they dont use round anymore
[21:10:50] <katsmeow> this is a tube, lathed to form 5 belt sheaves, and were from a guy who worked on Otis elevators
[21:11:19] <rue_shop5> maybe its to help string them
[21:11:41] <katsmeow> the tube is ~2 ft, the belts were maybe 4", there are 2 6312 in each end, and the assy weighs 97 lbs
[21:12:10] <rue_shop5> I'm really not sure
[21:33:29] <Tom_itx> https://murdercube.com/files/
[21:33:32] <Tom_itx> repeats for kat
[21:33:41] <Tom_itx> found some interesting files in there
[21:38:17] <katsmeow> IF i can get http working here again
[21:38:44] <katsmeow> it's working again ont he laptop, and i did nothing there, i am going to assume the problem was not at my end
[21:59:42] <any87375784> am i here?
[22:01:18] <any87375784> i seem to be n Canada : IP address 172.98.67.90 lookup, Canada location and IP 172.98.67.90 whois
[22:01:37] * any87375784 hides her whois ip
[22:27:16] <rue_shop5> ok
[22:27:26] <rue_shop5> I have finished the bare min assembly to test the board
[22:27:36] <rue_shop5> have to program a t13 and put it in
[22:27:51] <rue_shop5> see if the software even tries to work
[22:28:37] <katsmeow> 50amp 1kv bridge blocks for under $1 each, free s&h
[22:28:40] <rue_shop5> if it comes even close, then I install the freewheel diodes, and the current control circuit
[22:28:57] <katsmeow> trust me, they are going to melt down at 50 amps
[22:28:57] <rue_shop5> yes, but whats the Vf of them :)
[22:29:12] <katsmeow> 1.2v @ 50amp, supposedly
[22:29:13] <rue_shop5> at 1kv, they prolly dont care if its like 5V
[22:29:21] <rue_shop5> hah, I dont believe it
[22:29:35] <rue_shop5> er, is 1N4004 1kv?
[22:29:48] <katsmeow> ordinary heavy spade terminals, but with holes in them, they won't hold 40amps , 50MAYBE with forced air on the terminals
[22:30:00] <katsmeow> no 4004 is 400
[22:30:12] <katsmeow> 4009 is 900 (1kv)
[22:30:15] <rue_shop5> step 1) wet terminals with brazing paste
[22:30:18] <katsmeow> 4001 is 50v
[22:30:27] <rue_shop5> today I learned there is brazing paste, like solder paste
[22:30:59] <rue_shop5> they use it for brazing carbide to sawblades
[22:31:06] <rue_shop5> and other stuff I'm sure
[22:31:06] * katsmeow nods
[22:31:31] <rue_shop5> I was trying to find a selection of videos to demonstrate how hot you can get carbide while brazing it to steel
[22:31:37] <rue_shop5> it looks like the sky is the limit
[22:31:53] <rue_shop5> but of course the pros put as little heat on them as possable
[22:32:14] <rue_shop5> kat
[22:32:20] <katsmeow> rue
[22:32:22] <rue_shop5> I think I forgot how to program a tiny13
[22:32:30] <katsmeow> prolly
[22:33:49] <rue_shop5> OO... I have two boxes of lcds now
[22:34:33] <rue_shop5> aha! a t13 programming baord
[22:38:20] <rue_shop5> avrdude: no programmer has been specified on the command line or the config file
[22:38:20] <rue_shop5> Specify a programmer using the -c option and try again
[22:38:21] <rue_shop5> hmmm
[22:38:31] <rue_shop5> ah wrong command
[22:38:33] <rue_shop5> ok
[22:38:38] <rue_shop5> its programmed!
[22:38:44] <rue_shop5> :-S here goes...
[22:39:04] <rue_shop5> setup will take a while
[22:39:22] <rue_shop5> I'v never run it, but I know about 2 software bugs already
[22:49:59] <rue_shop5> nope, I got something wrong
[22:52:57] <rue_shop5> its pulsing all the lines, I think I got the output strobe wrong
[22:53:20] <katsmeow> i grabbed 3 used sata drives for ~$3 each, still in equipment "obsolete" ,,,,,,,,, how can sata be obsolete already?
[22:53:33] <rue_shop5> :)
[22:55:12] <__m00n__> who gives for # dollars each?
[22:55:15] <__m00n__> 3
[22:56:12] <katsmeow> there they were, still in equipment, i paid $3 per equipment, with the sata in them
[22:58:42] <katsmeow> those HF "super-dremels" are stil on sale
[23:02:10] <katsmeow> $20 , cheaper than a regular dremel, and have 1/8 and 1/4 collets
[23:29:32] <rue_shop5> :)
[23:29:53] <rue_shop5> PB0 INPUT DIRECTION
[23:29:53] <rue_shop5> PB1 INPUT STEP SIGNAL
[23:29:53] <rue_shop5> PB2 OUTPUT CLOCK
[23:29:53] <rue_shop5> PB3 OUTPUT DATA
[23:29:53] <rue_shop5> PB4 OUTPUT STROBE
[23:31:23] <rue_shop5> oh, heh
[23:31:25] <rue_shop5> get this one
[23:31:58] <rue_shop5> while doing a fire alarm system yearly test I cut my finger on the glass window of one of the equipent boxes
[23:32:02] <rue_shop5> in a hospital
[23:32:06] <rue_shop5> in the emergency room
[23:32:08] <rue_shop5> :/
[23:32:14] <__m00n__> HAR
[23:32:18] <rue_shop5> GOOD ONE RUE
[23:32:19] <__m00n__> if your ok though
[23:32:25] <rue_shop5> yea, minor
[23:32:43] <__m00n__> im not sure if thats really stupid or really genius
[23:32:59] <rue_shop5> sharp edge
[23:33:12] <__m00n__> squishy finger?
[23:33:49] <__m00n__> any chinese brides come in the mail for me yet?
[23:34:15] <katsmeow> lesbians can get married in Canadia too?
[23:34:29] <__m00n__> yes..
[23:34:35] <katsmeow> congrats
[23:34:47] <katsmeow> why import chiese?
[23:34:56] <__m00n__> cuz they so pretty
[23:34:57] <rue_shop5> your bridge drivers have been here for ever you nit
[23:35:12] <__m00n__> yeah my H brigez
[23:35:17] <__m00n__> :)
[23:37:29] <rue_shop5> hahahaha it works!
[23:37:32] <rue_shop5> sweet
[23:40:27] <rue_shop5> now, I did screw up the circuit
[23:41:00] <rue_shop5> the free wheeling circuit is supposed to include the current sense resistor so that it can monitor the current winding back down
[23:41:07] <rue_shop5> BUT I screwed that up
[23:41:38] <rue_shop5> this is why the current sense should be off the top rail
[23:44:50] <rue_shop5> but if I put the current sense resistor off the + feed to the center tap of the motor, it would be lifted above the + rail during flyback
[23:46:58] <katsmeow> if both transistors are off, where's the circuit the current flows thru?
[23:47:36] <rue_shop5> freewheeling diode
[23:48:10] <rue_shop5> I'm confused I know there is a trick to this
[23:48:41] <rue_shop5> http://homepage.cs.uiowa.edu/~jones/step/current.html
[23:50:05] <rue_shop5> oh its monostable based
[23:50:13] <rue_shop5> I thought that was just a bad idea of mine
[23:53:48] <rue_shop5> 4.1 dosn't make much sense to me, when it turns off, it loses the feedback voltage
[23:54:16] <rue_shop5> oh, I see
[23:54:56] <rue_shop5> they always keep the bottom ones on, its always pushing current thru the sense resistor
[23:57:11] <rue_shop5> but wait
[23:57:15] <rue_shop5> the votlage dosn't flip
[23:57:22] <rue_shop5> the ... what...
[23:57:29] <rue_shop5> the current decays
[23:57:40] <rue_shop5> the polarity should flip
