#garfield Logs
May 14 2021
#garfield Calendar
01:14 AM rue_shop1: I have a M6322 (oki) .... check it out...
08:30 AM aandrew: wow this is screwy
08:30 AM aandrew: I've never run across this before
08:30 AM aandrew: I'm talking to an ST25R3911B (NFC controller) chip via SPI
08:31 AM aandrew: I can talk to the chip, no problem. I can - through the chip - detect NFC cards and even read back the card's ID field (basically a MAC address), again no problem
08:31 AM aandrew: I can't select a "file" (NDEF record) on the card and read it out - I get screwy data
08:31 AM aandrew: tried another board, same issue
08:32 AM aandrew: I have 10 boards total, 7 modded (footprint error), 2 of the 7 boards intermittently read the file off the NFC card
08:33 AM aandrew: weird... thought maybe some power issue but used a good bench supply - no change
08:33 AM aandrew: I added a bit of delay after asserting CS# and before releasing CS# - no change
08:33 AM aandrew: I selected a VERY slow SPI clock - it's working... wtf?
08:34 AM aandrew: turns out I was just going too fast for the NFC chip; I as at 16MHz SPI clock and it is specc'd for <= 6MHz
08:34 AM aandrew: but
08:34 AM aandrew: BUT
08:35 AM aandrew: why does the *SPI* clock speed affect the NFC (radio) operation -- all this time at 16MHz I had *NO* issue talking to the chip itself, and all 7 boards had NO issue getting the detected card's ID, which is also a radio operation
08:35 AM aandrew: but going a little "deeper" into the NFC card interaction created issues on SPI
08:36 AM aandrew: in my experience if the SPI clock is too fast you have *SPI* issues (register contents are goofy, chip won't do what you tell it to, etc.)
08:51 AM aandrew: I guess though in hindsight that's exactly what this is; I'm trying to read the answer from the card out of the ST25's FIFO registers, so maybe not quite so screwy but still weird that I can read OTHER data such as the NFC ID reliably
10:03 AM rue_mohr: huh
10:04 AM rue_mohr: I was pondering how to convert the video data for this lcd to 1 channel, it'd have to run at 4MHz, but then how thats only 500kHz from the parallel bus
10:05 AM rue_mohr: the serial disadvantage
04:48 PM polprog: I still havent fiured out what all the pins on the OKIDATA display do
04:49 PM polprog: figured even
04:49 PM polprog: but it's a shift register too
04:51 PM rue_mohr: yea
04:51 PM rue_mohr: what chipset is it?
04:52 PM rue_mohr: wait, you had a pinout didn't you?
04:52 PM polprog: yes, i did, i found the clk and data inputs
04:52 PM polprog: honestly i could give it a try now
04:53 PM rue_mohr: did you have a datasheet for it?
04:53 PM rue_mohr: I could help you reverse it if you want
04:53 PM rue_mohr: I'm getting the hang of it
04:53 PM polprog: i have a datasheet, i even got it do display something when i coupled some noise in with my finger
04:53 PM polprog: gimme a sec
04:54 PM rue_mohr: the G648D?
04:58 PM polprog: https://polprog.net/rozne1/ircjunk/xerox_lcd/
04:59 PM polprog: also heh, youre famous: https://polprog.net/rozne1/ircjunk/xerox_lcd/
04:59 PM polprog: eh
04:59 PM polprog: wrong link
04:59 PM polprog: https://polprog.net/rozne1/ircjunk/xerox_lcd/
04:59 PM polprog: WTF
04:59 PM polprog: https://forbot.pl/forum/topic/8138-serwo-a-generowanie-zaklocen/?do=findComment&comment=84095
05:00 PM polprog: stuid site with a broken copy
05:00 PM polprog: stupid
05:00 PM rue_mohr: hah
05:00 PM rue_mohr: good, someone likes it!
05:00 PM polprog: what are the scope traces from?
05:02 PM rue_mohr: the software for the digital scope I was building
05:02 PM rue_mohr: :)
05:03 PM rue_mohr: I still have a box of parts for it
05:03 PM rue_mohr: including a tektronix dual channel front end
05:03 PM rue_mohr: (module)
05:03 PM polprog: what module?
05:04 PM * Tom_L thinks rue_mohr has one of everything
05:04 PM rue_mohr: a tektronix scope module
05:05 PM rue_mohr: ok, catching up with your display, 1 sec
05:05 PM rue_mohr: ok 5260 and 5278
05:06 PM rue_mohr: polprog, the lm324 (CA6324) is for doing the bias voltages
05:06 PM rue_mohr: there needs to be a negative voltage for the panel
05:06 PM rue_mohr: 1 min
05:06 PM rue_mohr: see the transistor?
05:06 PM rue_mohr: the connection to its base is the contrast signal
05:07 PM rue_mohr: ok, so
05:07 PM rue_mohr: one of the chips drives the row and the other drives the columns
05:08 PM rue_mohr: polprog, you still with me?
05:08 PM polprog: yes
05:08 PM rue_mohr: this is the row driver chip
05:08 PM rue_mohr: there should be 1 or 2 of them?
05:08 PM rue_mohr: (MSM5278)
05:09 PM rue_mohr: https://www.digchip.com/datasheets/parts/datasheet/340/MSM5260-pdf.php
05:10 PM rue_mohr: the DF signal on the two chips is common, you want to run it at about 40Hz (50%)
05:10 PM rue_mohr: but it needs to be synched
05:10 PM rue_mohr: so, see how this is an 80 bit shift register?
05:11 PM polprog: yes
05:11 PM polprog: hmm
05:11 PM polprog: i knew the shift reg part already
05:11 PM polprog: gimme 15 mins, i have to clean the desk up and get the displays
05:12 PM rue_mohr: I'm doing some concept diagrams
05:13 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1190560.jpg
05:14 PM rue_mohr: conceptually, this is how the screens work
05:14 PM rue_mohr: data for columns is loaded into registers that are parallel triggered for the columns
05:14 PM rue_mohr: while one-at-a-time rows are active
05:14 PM rue_mohr: say when your reads
05:14 PM rue_mohr: y
05:33 PM rue_mohr: oops I errored
05:33 PM rue_mohr: the clock to the 4017 should be on the load
05:33 PM rue_mohr: not pixel clock
05:41 PM polprog: hooking it up
05:42 PM rue_mohr: no wait,
05:42 PM rue_mohr: let me tell ya how it works...
05:42 PM rue_mohr: dont put a positive voltage on vee!
05:46 PM polprog: looks lit it works
05:46 PM rue_mohr: :) which what did you do?
05:47 PM polprog: same thing i was at when i did it last time
05:47 PM polprog: touch the clock/data
05:47 PM rue_mohr: ok, we need to trace some signals to run it
05:47 PM rue_mohr: I think you will have 8
05:48 PM polprog: yes, likely
05:48 PM rue_mohr: so
05:48 PM polprog: there are 12 identical chips
05:48 PM rue_mohr: did you see that diagaram?
05:48 PM polprog: which one?
05:48 PM rue_mohr: yea
05:48 PM rue_mohr: rue_mohr> http://ruemohr.org/~ircjunk/tempimage/p1190560.jpg
05:48 PM rue_mohr: look that
05:49 PM polprog: yes
05:49 PM rue_mohr: ok you get that eh?
05:49 PM polprog: its easy
05:49 PM rue_mohr: strobe the rows, load the columns
05:49 PM rue_mohr: so
05:49 PM polprog: 4017 = sequential?
05:50 PM rue_mohr: yea
05:50 PM rue_mohr: you dont know the 4017?
05:50 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1190561.jpg
05:50 PM rue_mohr: ^^ next slide
05:51 PM rue_mohr: so they dont use a johnston counter, they use a shift register
05:51 PM rue_mohr: at the start of each screen, a 1 is loaded into it
05:51 PM rue_mohr: by the way I have an error there, the clock line for the vert driver is off the load, not the clk of the bottom regs
05:52 PM polprog: mm
05:52 PM polprog: i know how this works, i just need to find the clock and data line[s]
05:53 PM rue_mohr: did you get that other datasheet?
05:55 PM polprog: no
05:55 PM rue_mohr: you need it
05:55 PM rue_mohr: <rue_mohr> https://www.digchip.com/datasheets/parts/datasheet/340/MSM5260-pdf.php
05:56 PM polprog: ahh
05:56 PM polprog: https://www.alldatasheet.com/datasheet-pdf/pdf/11196/OKI/MSM5260.html
05:56 PM polprog: ah
05:57 PM polprog: i remember it, i forgot to put it there
05:57 PM rue_mohr: so, find the 4 data lines from the 5260
05:58 PM rue_mohr: but I dont see 4 on it?
05:58 PM polprog: theres only one, D1 and clock CP
05:58 PM rue_mohr: all 12 chips cant be identicle
05:59 PM rue_mohr: there are two types of chips
05:59 PM polprog: right
05:59 PM rue_mohr: k
05:59 PM polprog: theres one MSM5278, six 5260 and six unlabeled ones
06:00 PM polprog: ah
06:00 PM polprog: sec. Ill show you a pic of the entire back
06:00 PM rue_mohr: their flipped
06:01 PM rue_mohr: see the pinout is mirrored
06:01 PM rue_mohr: I think there should be two 5278 and the rest 5260
06:02 PM polprog: yeah they are
06:03 PM rue_mohr: so
06:03 PM rue_mohr: hmm they did something unusual
06:03 PM rue_mohr: whatever
06:04 PM polprog: https://polprog.net/rozne1/ircjunk/xerox_lcd/xerox_lcd_back.jpg
06:04 PM rue_mohr: there are 4 control lines you need to fine
06:04 PM rue_mohr: there are 4 control lines you need to find
06:04 PM polprog: DI1, CP, LOAD and what?
06:04 PM rue_mohr: ooo they split the top and bottom
06:04 PM rue_mohr: interesting
06:05 PM rue_mohr: so the 5278 usually controls 64 rows
06:05 PM rue_mohr: they are it doing 128
06:06 PM rue_mohr: lets start with the 5278
06:06 PM polprog: ok
06:06 PM rue_mohr: there will be CP, IO64, DF
06:07 PM rue_mohr: it MIGHT be IO1, I think there is a diagram error
06:07 PM rue_mohr: yea, IO1 or IO64
06:07 PM rue_mohr: find those 3 on the header
06:11 PM polprog: i cant find IO1 on any header
06:11 PM polprog: refresh notes.txt
06:11 PM rue_mohr: ok, might be IO64
06:11 PM polprog: IO64 is shown as bidir in the datasheet
06:11 PM rue_mohr: they make the chips so you can go either way, they bias the datasheets to using IO64
06:11 PM polprog: IO1 is output only
06:11 PM polprog: ye
06:11 PM rue_mohr: no
06:11 PM polprog: let me solder some pin headers to the pin headers
06:11 PM rue_mohr: its that error I was talking about
06:12 PM rue_mohr: its a bidirectional pin, SHL dtermines if its input or output
06:12 PM polprog: ooh
06:12 PM rue_mohr: and SHL will be hardwired up or down
06:12 PM rue_mohr: yea, you can see the timing diagram below that proves the upper note is wrong
06:13 PM polprog: SHLto VCC
06:13 PM rue_mohr: yea, IO64 will be your input
06:14 PM polprog: lets connect then
06:14 PM rue_mohr: not ready yet
06:14 PM rue_mohr: did you find the others?
06:14 PM rue_mohr: there will be CP, IO64, DF
06:15 PM polprog: yes
06:15 PM polprog: check the notes.txt file
06:15 PM polprog: im editing it rn
06:15 PM polprog: :)
06:15 PM rue_mohr: ok, so lets find the signals we need from the other chip
06:17 PM rue_mohr: from the 5260: DI1 (from just two of the chips), CP (should overlap), LOAD (should overlap)
06:17 PM rue_mohr: so I think you have just two data lines, one for the top half and one for hte bottom
06:18 PM rue_mohr: load should be CP should be its own sorry, I'm going a bit fast
06:18 PM rue_mohr: load should be the same as CP from the other one
06:19 PM rue_mohr: the CP's are seperate
06:25 PM rue_mohr: so, you should have
06:26 PM polprog: theres only LOAD
06:26 PM polprog: on the pin headers
06:26 PM polprog: CP and D1 are not broken out
06:27 PM rue_mohr: Vcc, GND, Vee, contrast, D0, D1, CL2 (pixel clock), FLM (IOx), CL1 (CP), M
06:27 PM rue_mohr: D1 from two of the chips has to be
06:28 PM rue_mohr: one for upper, one for lower
06:28 PM rue_mohr: DI1
06:28 PM rue_mohr: pin 94
06:28 PM polprog: ok it is
06:29 PM polprog: but only to the first IC (IC14)
06:29 PM rue_mohr: times two
06:29 PM polprog: pin 6 large header
06:29 PM rue_mohr: two of them, try other side of the baord
06:29 PM rue_mohr: I'm 98% sure
06:29 PM rue_mohr: remember its mirrored
06:30 PM rue_mohr: cause they are mounted upside down
06:30 PM polprog: ok
06:30 PM rue_mohr: I wonder why they ahve the two headers...
06:31 PM polprog: its on the second header too
06:31 PM polprog: hmm
06:32 PM polprog: both D1s are on both headers
06:32 PM polprog: f5
06:32 PM rue_mohr: k
06:32 PM rue_mohr: thats your upper and lower half pixel data
06:32 PM polprog: maybe cp is there too
06:33 PM rue_mohr: super carefull, they say 8-18V for the bias voltage, but I'm pretty sure they mean -8 to -18
06:34 PM rue_mohr: VLCD: VDD – V5 = 0 to 18
06:34 PM rue_mohr: yea they mean -8 to -18!!!!
06:34 PM Tom_L: what u 2 up 2?
06:34 PM rue_mohr: my screen works properly when the negative supply is atleast -14V
06:34 PM rue_mohr: lcd screen reversing
06:35 PM rue_mohr: polprog, do you have a supply you can generate -12V or so with?
06:35 PM polprog: -12? no i only have 1 lab psu :<
06:35 PM rue_mohr: k
06:35 PM polprog: but this one displays the stuff okay
06:35 PM polprog: there might be a charge pump on it
06:35 PM rue_mohr: have a max 232?
06:36 PM rue_mohr: no, its fluke
06:36 PM rue_mohr: as soon as you start driving it for video it doen'st show anyting if the votlages aren't about right
06:36 PM polprog: ill try feeding it a signal
06:37 PM rue_mohr: ok
06:37 PM rue_mohr: you have the two data lines, right?
06:37 PM polprog: yes
06:37 PM rue_mohr: ok
06:37 PM rue_mohr: relaoding your text file :)
06:37 PM rue_mohr: two data ok.
06:37 PM rue_mohr: clock pulse for the data,
06:38 PM rue_mohr: Cp from the 5260 for pixel clock, do you have that...
06:39 PM rue_mohr: yes, ok
06:39 PM rue_mohr: its shared to all of them, that right
06:39 PM rue_mohr: pixel clock
06:39 PM rue_mohr: next is latch signal for the pixels,
06:39 PM rue_mohr: "load" from the 5260
06:39 PM rue_mohr: you have that
06:40 PM rue_mohr: next is for the vert system
06:40 PM rue_mohr: the clock of the vert shift reg IS the load for the 5260, they are wired togethor
06:40 PM rue_mohr: "first line mark" is the IOx
06:40 PM rue_mohr: you have that
06:41 PM rue_mohr: next is the M signal, the main invert for the panel
06:41 PM rue_mohr: you have that as DF
06:41 PM rue_mohr: next voltages
06:41 PM rue_mohr: you have the wire from the base of the transistor, yes?
06:41 PM rue_mohr: it goes thru a resistor?
06:42 PM rue_mohr: https://twitter.com/RueNahcMohr/status/1393336236937416705/photo/1
06:42 PM polprog: no
06:42 PM rue_mohr: must be somewhere
06:43 PM rue_mohr: maybe its just on the built-in pot?
06:43 PM rue_mohr: in whcih case the pot might straddle gnd and vee?
06:44 PM rue_mohr: brb, checking garden
06:44 PM polprog: could be
06:44 PM polprog: the transistor has just the emitter marked
06:44 PM polprog: the emitter goes to V0 which goes to a pot between vcc and gnd on my breadboard
06:46 PM Tom_L: rue_mohr, i had to swap out the kbd. it got sticky again
06:47 PM polprog: i got it coupling noise in
07:06 PM rue_mohr: is the transistor NPN or PNP
07:06 PM rue_mohr: Tom_L, yes, sugar is usually the end of any keybaord
07:07 PM rue_mohr: so X2, 4 is DF
07:08 PM rue_mohr: 7 is Data
07:08 PM rue_mohr: 8 is data
07:09 PM rue_mohr: hey you said pin 11 goes to the base of the transistor
07:09 PM rue_mohr: its pnp isn't it?
07:09 PM Tom_L: if it ends up being only 3-4 buttons, i'll desolder them and clean them out
07:09 PM rue_mohr: pin 12 would be VEE
07:10 PM rue_mohr: k
07:10 PM polprog: i got a repetitive image
07:10 PM rue_mohr: polprog, BE SURE NOT TO APPLE +20v TO THE SCREEN!!!
07:10 PM polprog: what 20v
07:10 PM rue_mohr: your notes say that cause of the horrid way they express the votlages
07:10 PM rue_mohr: its actually -20V
07:11 PM polprog: o
07:11 PM rue_mohr: that took me about half an hour to be sure of yesterday
07:11 PM polprog: ok, its all running at 5V
07:11 PM rue_mohr: have it on a controller yet?
07:12 PM polprog: no, just a 4024 and a signal gen
07:13 PM polprog: i have it displaying stripes in the vertical direction
07:13 PM polprog: https://twitter.com/polprogpl/status/1393354234914033666
07:14 PM rue_mohr: heh, kinda
07:14 PM Tom_L: i wonder if i can find a PS-2 plug adapter for the larger old kbd plug
07:14 PM polprog: 20Hz clock so they flow slowly
07:14 PM Tom_L: what was it called?
07:14 PM polprog: AT?
07:14 PM rue_mohr: like I say, when you spark up the grapics, you need the bias to be right
07:14 PM Tom_L: yeah
07:14 PM Tom_L: at or xt
07:14 PM polprog: hmm
07:14 PM polprog: XT keyboard, ive seen that name in the spectrum analyzer manual
07:14 PM rue_mohr: PC/XT to AT
07:15 PM polprog: at 2 hz clock it starts to fade down
07:15 PM rue_mohr: do you have a blue pill?
07:15 PM polprog: yes
07:15 PM rue_mohr: Ihave code...
07:15 PM rue_mohr: ?
07:15 PM Tom_L: https://www.ebay.com/itm/143516239687
07:15 PM polprog: looks like the right contrast voltge is close to 0v
07:15 PM Tom_L: that's kinda nuts
07:16 PM Tom_L: i wonder if the usb would work on that old xt
07:16 PM rue_mohr: polprog, when you get it running, you need about -14V
07:16 PM polprog: ok
07:17 PM Tom_L: https://www.amazon.com/DIN-Male-DIN-Female-Keyboard-Adapter-KB-ATM-PS2F-6I/dp/B001P73TE6/ref=sr_1_4?dchild=1&keywords=ps2+to+at+keyboard+adapter&qid=1621037012&sr=8-4
07:18 PM Tom_L: all the ones i have go the other way
07:18 PM rue_mohr: if your ok to wait 3 months I can send you one
07:18 PM Tom_L: ps2 female to xt male?
07:18 PM polprog: ok. so the transistor middle pin goes to ground
07:19 PM polprog: emitte goes to V5
07:19 PM Tom_L: i haven't given up on the sticky kbd just yet
07:19 PM polprog: the opposite pin goes to V0
07:20 PM rue_mohr: all they did was change the connector
07:20 PM Tom_L: even on usb?
07:20 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1190569.jpg
07:21 PM Tom_L: due to room constrains the pigtail is best
07:21 PM rue_mohr: its the wrong way
07:21 PM Tom_L: so is mine
07:21 PM rue_mohr: I dont think I'v seen one, you could make one
07:22 PM Tom_L: holy shit! i found one
07:22 PM Tom_L: in an old old old laptop i had on the shelf
07:22 PM rue_mohr: polprog, emitter to V5,
07:22 PM rue_mohr: base to ground
07:23 PM rue_mohr: whats V0
07:23 PM rue_mohr: something doesn't add up
07:23 PM rue_mohr: one of the signals isn't what you think it is
07:23 PM Tom_L: ok now at least i have another option
07:24 PM rue_mohr: polprog, ok
07:24 PM rue_mohr: try this
07:24 PM rue_mohr: what do you call the line that goes to pin 11 of the LM324
07:25 PM rue_mohr: need to find an IRF840
07:25 PM Tom_L: tip of the day: never take a sleeping pill and a laxative on the same night.
07:25 PM polprog: there is no 324
07:26 PM polprog: oh
07:26 PM polprog: LA6324
07:26 PM rue_mohr: yes there is, look for *324*
07:26 PM rue_mohr: yup
07:26 PM rue_mohr: its an LM324
07:27 PM polprog: its VEE
07:27 PM rue_shop1: ok
07:28 PM rue_shop1: that VEE is a variable voltage that changes with the contrast setting
07:28 PM polprog: yes
07:28 PM rue_shop1: there is a transistor between it, and the incomming negative supply
07:29 PM rue_shop1: pin xx (transistor) VEE
07:29 PM polprog: VEE goes to the middle pin of the transistor
07:30 PM rue_shop1: ok, thats either the emitter or collector
07:31 PM rue_shop1: did you have two bigs caps on there?
07:31 PM rue_shop1: one across 5V and one across something else?
07:31 PM polprog: yes
07:31 PM polprog: the other cap has the + on gnd
07:32 PM polprog: so vee is supposed to be negative
07:32 PM polprog: because the cap C3 is across GND +--||--- Vee
07:32 PM rue_shop1: yes
07:32 PM rue_shop1: its vee tho?
07:32 PM rue_shop1: odd
07:32 PM polprog: yes
07:32 PM rue_shop1: but whatever
07:33 PM rue_shop1: so, there is a 5? resistor divder chain down from 5V to something (vee?)
07:34 PM polprog: yes, but not to VEE
07:34 PM polprog: to the emitter of the Q!
07:35 PM rue_shop1: ok
07:35 PM rue_shop1: and its NPN or PNP?
07:35 PM rue_shop1: (diode test)
07:36 PM polprog: npn
07:36 PM rue_shop1: ok
07:36 PM polprog: F5 :)
07:37 PM rue_shop1: in the shop url me!
07:37 PM polprog: https://polprog.net/rozne1/ircjunk/xerox_lcd/notes.txt
07:38 PM rue_shop1: you saw the twitter deiagram for the 324 right?
07:40 PM polprog: yeah
07:40 PM polprog: looks similar
07:40 PM polprog: see mine
07:41 PM rue_shop1: yea that why I asked, its the same setup
07:41 PM rue_shop1: but the transistor on yours seems different
07:41 PM rue_shop1: so
07:42 PM rue_shop1: I'm getting lost with this
07:42 PM rue_shop1: but you have a pot on yours dont ya?
07:42 PM polprog: yes
07:42 PM rue_shop1: hows it connected
07:42 PM rue_shop1: a circuit sketch would help me here too
07:43 PM polprog: sure, gimme a sec
07:43 PM rue_shop1: you have an incomming voltage that needs to be about -14V, there is a circuit which does contrast control, in the process varrying VEE from -14 to 0
07:43 PM polprog: hard to make that in a txt file
07:44 PM rue_shop1: OMG this is a 900V FET
07:44 PM rue_shop1: wtf
07:44 PM rue_shop1: yes, but do you know which pin takes the -14V?
07:44 PM rue_shop1: and I'll get that code posted, give me a min
07:44 PM rue_shop1: is your blue pill breaboardable?
07:45 PM polprog: yeah it is
07:46 PM rue_shop1: I'm gonna zip and post the code just on my site for now
07:46 PM rue_shop1: too much hastle to git it
07:47 PM rue_shop1: http://ruemohr.org/%7Eircjunk/programming/lcd.tgz
07:50 PM rue_shop1: it just goes logically, clocks in pixls just like you would a 595
07:50 PM rue_shop1: then strobes a line
07:50 PM rue_shop1: the other code flips the M for every new screen
07:50 PM rue_shop1: and I have some stuff in there to hold 1 line of pixel data
07:50 PM rue_shop1: (not enough memory for the whole screen)
07:51 PM polprog: https://i.ibb.co/cCjyXLZ/IMG-20210515-023631.jpg
07:51 PM rue_shop1: no its pnp
07:51 PM rue_shop1: oh wait
07:52 PM rue_shop1: no its pnp
07:52 PM polprog: i measured i..
07:52 PM polprog: ill check agan
07:52 PM rue_shop1: has to be pnp
07:52 PM rue_shop1: v0 would be your negative in
07:53 PM rue_shop1: but soemthing still doesn't add up
07:53 PM rue_shop1: can you sketch the pot in there?
07:53 PM rue_shop1: oh it is
07:53 PM polprog: measuring emitter and middle pin on diode mode. E+ middle- -> 1.5V; E- middle+ -> 0.4
07:54 PM rue_shop1: ok, I think this is something new for me
07:54 PM rue_shop1: I think, its actually a reverse protection transistor
07:54 PM rue_shop1: which ones are on the header?
07:54 PM rue_shop1: v0 AND vee? just V0?
07:55 PM rue_shop1: pin 10 on x2 will be mixed up in this somehow
07:55 PM polprog: only V0 is on X2
07:55 PM rue_shop1: X2 , is pin 10 used?
07:56 PM rue_shop1: 5, 11, 12 might be lines to other 6250 data pins...
07:56 PM polprog: 10 is some other power supply voltage, it has two caps across it like the other rails do
07:57 PM polprog: but it doesnt go to the LM324
07:57 PM polprog: 10 is ground
07:57 PM polprog: 11 is n/c
07:58 PM polprog: ok
07:58 PM polprog: i got the code
07:58 PM polprog: gotta link the libopencm or something
07:59 PM polprog: Makefile:159: /usr/lib/arm/mk/genlink-rules.mk: No such file or directory
07:59 PM polprog: im hungry
07:59 PM rue_shop1: its your makefile
07:59 PM polprog: its 03:00
07:59 PM polprog: oh
07:59 PM rue_shop1: :)
07:59 PM rue_shop1: hah
07:59 PM polprog: so ill just leave it on the desk and go grab a sandwich, and go to sleep
07:59 PM polprog: ill continue tomorrow :)
07:59 PM rue_shop1: lrwxrwxrwx 1 1005 1005 23 Jan 23 23:20 Makefile -> ../Makefile-polprog-new
07:59 PM polprog: :P
07:59 PM rue_shop1: k, gnight
08:00 PM polprog: meanwhile you can check out the sound blaster video
08:02 PM polprog: night
08:06 PM rue_shop1: :)
08:50 PM Tom_L: wow, i blinked and got 2.5k views on one silly video
08:52 PM rue_mohr: haha! which one?
08:52 PM Tom_L: https://www.youtube.com/watch?v=rX4eP3QLwo0&t=5s
08:53 PM rue_mohr: where did you get with the tuning?
08:53 PM rue_mohr: like, is that before or after?
08:53 PM Tom_L: i was gonna work on it tonight but got distracted
08:54 PM Tom_L: the rpi one got 1.8k
08:55 PM Tom_L: last i looked only a handfull watch any of mine
08:55 PM rue_mohr: interesting
08:55 PM Tom_L: i tried turning comments on but i dunno if i did or not
08:56 PM Tom_L: i don't ever have time to keep looking to reply
08:57 PM Tom_L: i stalled the spindle on one of those new cutters on a heavy cut because of the spinup time
08:57 PM Tom_L: othewise i think it would have cut it fine
08:58 PM rue_mohr: eeek
08:58 PM rue_mohr: was it ok?
08:58 PM Tom_L: didn't hurt anything
08:59 PM rue_mohr: good way to lose cutters
08:59 PM Tom_L: cutter is still good too
08:59 PM rue_mohr: is there a spinup provision?
08:59 PM Tom_L: yes
08:59 PM Tom_L: that's where i was gonna start
08:59 PM Tom_L: i wonder if i should keep the spinup and spindown times the same
09:05 PM Tom_L: https://www.youtube.com/watch?v=A7PcbEKrtkI
09:05 PM Tom_L: see if comments are turned on on that one...
09:05 PM Tom_L: hard for me to check that since i'm logged in the channel
09:06 PM aandrew: howdy all
09:10 PM Tom_L: ok i think that fixed it
09:20 PM Tom_L: rue_mohr, P4 parameter P1-9 & 10 http://tom-itx.no-ip.biz:81/~webpage/cnc/PDF/BLDC/GlockCNC+1200+Watt+Brushless+Spindle+Motor+Driver.pdf
09:38 PM rue_shop1: eeek thing pdf
09:39 PM rue_shop1: tick
09:39 PM rue_shop1: thick
09:39 PM rue_shop1: no I cant type
09:39 PM rue_shop1: I need a 100V zener
09:39 PM rue_shop1: ah, some 60s
09:40 PM rue_shop1: erp, the caps are rated for 400, I better back off a bit
09:41 PM aandrew: rue_shop1: what are you doing that's got you near the design limit of 400V caps?
10:11 PM rue_mohr: 400V inverter to charge caps for the CD spot welder for tabbing batteries
10:40 PM aandrew: aha
10:56 PM rue_mohr: https://github.com/skiselev/easy_z80/blob/master/KiCad/Easy_Z80-Schematic-1.1.pdf
10:56 PM rue_mohr: nice
10:56 PM rue_mohr: I have to look closer at those z80 perphials
10:57 PM rue_mohr: what he did do was to use a 16V8 for the chip select
10:58 PM rue_mohr: which helps nudge me in the same direction
11:02 PM rue_mohr: so, I wonder how much current flows when you dump 380V into the primary of a 40:1 transformer with a shorted secondary
11:20 PM rue_shop1: I might have enough 450V caps here to comfortably do 400V
11:20 PM rue_shop1: I have 1500uF I can do it with
11:32 PM rue_mohr: k
11:32 PM rue_mohr: hmm
11:32 PM rue_mohr: so I need to make a board, with the caps, and the IGBT
11:33 PM rue_mohr: maybe I should just give it a peice of clad with a strip out the middle