#garfield Logs

Aug 14 2017

12:48 AM rue_more: <rue_shop3> Tom_L, the led, use a 330R resistor, the drive current is 8.5mA, the output voltage drop is 1V
07:34 PM Tom_itx is now known as Guest24493
08:20 PM rue_more: ^^ those ones
08:23 PM Tom_itx: who?
08:23 PM Tom_itx: netsplit cleared my buffer
08:23 PM Tom_itx: cathode goes to gnd right?
08:24 PM Tom_itx: i'm gonna solder up a couple of these side by side
08:24 PM rue_more: <rue_shop3> Tom_L, the led, use a 330R resistor, the drive current is 8.5mA, the output voltage drop is 1V
08:25 PM rue_more: funny enough, my 200pcd of pc817 just arrived today
08:25 PM rue_more: pcs
08:25 PM Tom_itx: yeah i got 330 smt ready to go
08:25 PM Tom_itx: that and the part is really all i need now right?
08:25 PM Tom_itx: and some screw terminals to make it fancy
08:26 PM rue_more: dont forget the flyback relay
08:26 PM Tom_itx: oh the diode... 1m1001 enough?
08:26 PM rue_more: oh, images
08:26 PM Tom_itx: which way does that go?
08:26 PM Tom_itx: i haven't messed with anything for sssoooo long...
08:26 PM rue_more: http://ruemohr.org/~ircjunk/images/p1090270.jpg
08:26 PM Tom_itx: i could put it across the coil itself
08:26 PM rue_more: that good enough?
08:27 PM rue_more: I had to use a transistor to drive the opto cause me signal gen is 600R and cant do it
08:27 PM rue_more: rails are 24V
08:27 PM Tom_itx: i should be able to hook the led thru the 330 straight to 5v
08:27 PM Tom_itx: that's all i really need except the relay
08:27 PM rue_more: yup
08:27 PM rue_more: and the flyback diode
08:28 PM Tom_itx: yeah
08:28 PM Tom_itx: the band end has + going to it?
08:28 PM rue_more: yup
08:28 PM Tom_itx: i'll put that on the relay din mount
08:28 PM rue_more: the flyback is reverse polarity, so the diode shunts it into the power supply
08:28 PM Tom_itx: then it will go with the part it's protecting
08:28 PM Tom_itx: yeah
08:29 PM rue_more: your protecting the opto tho
08:29 PM rue_more: one hit is prolly enough to fuse the transistor
08:29 PM Tom_itx: 1001 enough diode?
08:30 PM Tom_itx: i dunno what all i have here
08:30 PM rue_more: 4001?
08:30 PM Tom_itx: i thought i got some just for this
08:30 PM Tom_itx: lemme check
08:31 PM Tom_itx: schottky better?
08:31 PM rue_more: no
08:31 PM rue_more: just regular silicone :)
08:32 PM Tom_itx: says i got 4004
08:32 PM rue_more: perfect
08:32 PM Tom_itx: 400v 1A
08:32 PM Tom_itx: should have 30 somewhere
08:32 PM Tom_itx: crap
08:32 PM Tom_itx: DO41 package
08:32 PM Tom_itx: wtf is that
08:33 PM Tom_itx: diode with no leads i bet
08:33 PM Tom_itx: smt
08:33 PM rue_more: got a burned out computer power supply?
08:33 PM Tom_itx: no
08:33 PM Tom_itx: they're all good
08:33 PM rue_more: got one you can scrap?
08:33 PM Tom_itx: not really, i use em all for something or other
08:34 PM rue_more: look out the window, is there one at the end of your neighbours driveway?
08:34 PM rue_more: look to your left, how about the other neighbour?
08:34 PM Tom_itx: haha i got my server that way :)
08:34 PM rue_more: well yea
08:34 PM Tom_itx: i have some around here lemme look around a bit
08:34 PM rue_more: someone within 300 feet of you right now has a junk computer they would be happy to give you
08:35 PM Tom_itx: all my junk got moved around now i can't find anything
08:35 PM Tom_itx: no, i know i have diodes
08:36 PM Tom_itx: just gotta remember where i put em
08:37 PM rue_more: I gotta 1/2hr nap
08:45 PM Tom_itx: don't turn that into 2hrs
08:47 PM Tom_itx: yay! found em. 1n4004
09:53 PM Tom_itx: http://tom-itx.no-ip.biz:81/~webpage/rue/OPTO_Top.jpg
09:53 PM Tom_itx: http://tom-itx.no-ip.biz:81/~webpage/rue/OPTO_Bottom.jpg
09:54 PM Tom_itx: one of those pads was shorted, i had to move the resistor on one of em
10:04 PM rue_more: huh
10:04 PM rue_more: but, yea, pretty nice a lean eh?
10:05 PM Tom_itx: he gave me that and a few other boards with orders
10:05 PM rue_more: :)
10:05 PM Tom_itx: i'll probably cut the corner off
10:06 PM Tom_itx: or mount it to a din mount and leave it as is
10:07 PM Tom_itx: huh, i don't have any recent pics of my box
10:07 PM Tom_itx: i'll go grab a couple
10:12 PM rue_shop3: so should I send you some din clips?
10:13 PM zhanx: rue printed the outlines, kids got crazy maybe tomorrow for the pieces to be done
10:13 PM rue_shop3: hahah
10:14 PM rue_shop3: yea, here I thought you would have them banged off the first time you had an hour to two
10:14 PM rue_shop3: Tom_itx, want a dxf of the dims for the din clips I did?
10:16 PM rue_shop3: geez, If I'd only grown up in a shop like I have now
10:16 PM rue_shop3: I'd be 15 years ahead easy
10:17 PM Tom_itx: http://tom-itx.no-ip.biz:81/~webpage/rue/Control1.jpg
10:18 PM Tom_itx: http://tom-itx.no-ip.biz:81/~webpage/rue/Control2.jpg
10:18 PM Tom_itx: http://tom-itx.no-ip.biz:81/~webpage/rue/Control3.jpg
10:18 PM Tom_itx: gettin kinda full
10:19 PM Tom_itx: the black Sharp part in 1 is what blew the board traces
10:19 PM Tom_itx: i unhooked it
10:19 PM Tom_itx: the blue relays are getting replaced
10:20 PM rue_shop3: ah your good for holders then
10:20 PM Tom_itx: yeah i think i still have a couple extra
10:21 PM rue_shop3: thats 1 hell of a 5V dirtibution bus :)
10:21 PM Tom_itx: i like that power strip in 3, that's all 5v stuff
10:21 PM Tom_itx: mesa sells em
10:21 PM rue_shop3: were the caps on that dc-dc like that when you got it?
10:21 PM Tom_itx: the top reg is 5v the bottom one is 10v for the spindle drive
10:21 PM Tom_itx: no i had those boards made
10:22 PM rue_shop3: too bad they dont put any pullup channels on it
10:22 PM Tom_itx: the caps were local surplus
10:22 PM Tom_itx: so were the transformers
10:22 PM rue_shop3: no, the chineese dc-dc converters in 3
10:22 PM Tom_itx: they're all 3 wired in parallel
10:22 PM rue_shop3: normally the state of the label on those caps would be an alarm for me
10:22 PM rue_shop3: but sometimes they come like that
10:23 PM Tom_itx: yeah
10:23 PM rue_shop3: what are the RCA to?
10:23 PM Tom_itx: the pullups on the 5v buss are for the differential pair i'm not using as differential pair
10:23 PM Tom_itx: rca?
10:23 PM rue_shop3: er, 1/4"
10:24 PM Tom_itx: what pic?
10:24 PM rue_shop3: 1/4" audio jacks
10:24 PM rue_shop3: 2
10:24 PM rue_shop3: right side of box
10:24 PM rue_shop3: oh tey aren't
10:24 PM rue_shop3: sory
10:24 PM Tom_itx: those are all din
10:24 PM Tom_itx: steppers
10:24 PM rue_shop3: oh
10:24 PM Tom_itx: etc
10:24 PM Tom_itx: one is to the spindle
10:25 PM Tom_itx: the box sits on top of the mill
10:25 PM rue_shop3: starts to spell out why they have 8' cabinets for industrial arms eh?
10:25 PM Tom_itx: the gecko drives are behind the heatsink on the door
10:25 PM Tom_itx: no kidding
10:26 PM Tom_itx: i need to add one more board but it makes it awfully crouded
10:26 PM Tom_itx: on that top row of din
10:26 PM Tom_itx: see the patched 50pin ribbon?
10:26 PM Tom_itx: i think i moved all my limit switches to that
10:27 PM Tom_itx: least likely to cause problems
10:27 PM Tom_itx: i added the plastic cover on the power switch
10:27 PM rue_shop3: nothing like gradual change to make a mess of a good layout
10:27 PM Tom_itx: after.... well you can guess
10:27 PM Tom_itx: yeah, i'm not gonna start over
10:28 PM rue_shop3: hopefully not numb for too long :)
10:28 PM Tom_itx: i could actually run the whole thing off one of those transformers
10:28 PM Tom_itx: the caps are mounted on boards in groups of 3
10:28 PM Tom_itx: that would free up alot of space
10:29 PM Tom_itx: but i wanted to plan ahead for plenty of power
10:29 PM Tom_itx: the cap in the middle along with a diode is the 24v supply
10:30 PM Tom_itx: the diode is actually in the heatshrink on one of the cap legs
10:32 PM rue_shop3: damnit, I have to start making application notes when I design 3d things
10:32 PM rue_shop3: I dont know how I intended this to be assembled
10:32 PM Tom_itx: it helps
10:32 PM Tom_itx: i have a whole book on that control box
10:32 PM rue_shop3: at a guess, you have 6x as much power as you use?
10:32 PM Tom_itx: oh probably
10:33 PM Tom_itx: the geckos are good for 7A
10:33 PM rue_shop3: heh, you didnt check after eh?
10:33 PM Tom_itx: i'm only using them at 2.5
10:33 PM rue_shop3: BUT
10:33 PM rue_shop3: TOM
10:33 PM rue_shop3: they are DC-DC
10:33 PM rue_shop3: so, 7A out, might only be 2A in
10:34 PM rue_shop3: I realized it when doing armyofevilrobots machine
10:34 PM rue_shop3: 3V motors, at like 4A
10:34 PM rue_shop3: which isn't 4A in
10:34 PM Tom_itx: those transformers are 48v umm 6A each?
10:34 PM rue_shop3: cause the input is 24V
10:34 PM Tom_itx: i forget
10:34 PM Tom_itx: centertapped on one
10:34 PM Tom_itx: i think the drivers are good to 80v
10:34 PM Tom_itx: maybe 70
10:35 PM Tom_itx: and i left room for a 4th axis
10:38 PM Tom_itx: so at 18A in, i could drive just about anything with that
10:39 PM rue_shop3: do it in watts
10:40 PM rue_shop3: take the motor V*I * coils
10:40 PM rue_shop3: *motors
10:40 PM rue_shop3: vs supply V*I tot
10:41 PM Tom_itx: i'm sure one would be plenty