#garfield Logs

Jan 08 2021

01:34 AM rue_mohr: hmm, at some point I might have to redo all my tech
01:40 AM rue_mohr: I'm starting to get burried in maintenance backlog
02:30 AM polprog: rue_mohr: oh that would explain it
02:30 AM polprog: that inductor was just a mains choke
02:31 AM polprog: ill ry with a different one
04:07 AM darkrose: rue_mohr: no, don't have a passport
04:07 AM darkrose: I should fix that
07:48 AM aandrew: rue_mohr: hundreds
07:48 AM aandrew: hundreds of taps
08:36 AM rue_mohr: oof
08:46 AM polprog: projector fun
08:46 AM polprog: i wonder if i beamed it onto the adjacent building i could get in trouble
08:47 AM polprog: depends what i beam, but id probably just boot DOS for shits and giggles :)
09:01 AM rue_mohr: I need to work out my scope problem
09:02 AM rue_mohr: I'm pretty worried, this stuff can get ugly fast
09:07 AM aandrew: your awesome scope stopped working? yikes
09:24 AM rue_mohr: it had a random crash when printing the screen that seems to no longer be random
09:24 AM rue_mohr: I found a log that says a few things aren't happy
09:25 AM rue_mohr: there may be a 68k subprocessor in there that cant find its memory
09:26 AM rue_mohr: the teeth are that there is a factory config memory in there that tends to get lost when things are done to the scope, and it cant be regenerated
09:38 AM rue_mohr: polprog, I wonder if someone was going to use the project for a printer
09:39 AM polprog: what project
09:39 AM polprog: projector?
09:40 AM polprog: I guess if you could focus it closer than 2' it could be used for photolitography
09:40 AM polprog: if you removed the UV filter as well
09:40 AM rue_mohr: yea
09:40 AM rue_mohr: ooh I'm late
09:40 AM rue_mohr: ARG
09:43 AM polprog: the lens has a thread inside so youd just need to find a right lens adapter
09:46 AM rue_mohr: do you think maybe the filter disk just flew off?
09:48 AM aandrew: rue_mohr: yeah I really dislike that design aspect of many pieces of test equipment, the almost-impossible-to-back-up, impossible to get another calibration/id blocks
09:56 AM polprog: No, this was probably a parts unit
09:59 AM polprog: or at least came from a company which dealt with these things
07:29 PM polprog: so i was playing with the Analog Discovery since the labs start on wednesday
07:29 PM polprog: it's pretty nice, the scope is 100MSa/s but the frontend is poor at these frequencies
07:30 PM polprog: the sig gen goes up to 5MHz and the square wave has visible ripple there
07:31 PM polprog: the LA has got 16k samples memory max which is pretty indefensible against the saelae clones (which have practically infinite because they send the samples in real time)
07:31 PM polprog: but it's good enough for education purposed and showing the ropes
07:32 PM polprog: It supposedly also has a pattern gen, network analyzer, spectrum analyzer, DSP etc
07:33 PM polprog: pretty weird to operate a scope with a mouse cursor, makes you think about the "traditional" oscilloscope HMI
07:35 PM polprog: Bascially an FPGA with USB on one side and an A/D + D/A on the other, I dont think if they even have any RAM in there because the buffer sizes are just ridiculous
07:55 PM polprog: hahaha, my stm8 driver for the hd44780 ended up in the gihub code vault project :D
07:55 PM polprog: My (then) bad C, preserved for the future generations
07:57 PM polprog: how come people buy electronic *parts* on amazon, that's like id go to the grocery to buy screws
07:58 PM Tom_L: you don't?
07:59 PM polprog: that andy kong guy looks sensible, but he;s clearly a CS student not an EE one
07:59 PM polprog: :^)
07:59 PM polprog: Tom_L: no, i cant imagine using amazon search to find any sensible electronic parts :P
08:00 PM polprog: 10uF MLCC 1206 cap: people who bought this also bought: 22k 1/4w resistor, Yihua soldering station, SuperDong premium fast vga cable (12ft)
08:01 PM polprog: i mean that in the nice way, his eye tracking program is pretty mind blowing but then he's running two leds off a laptop power brick without resistors and wonders why they are getting hot
08:02 PM polprog: "'ll probably mount it on a larger heatsink, because this thing gets HOT. "
08:02 PM polprog: that's the right way of thinking though :)
08:11 PM rue_mohr: hmm
08:16 PM polprog: might have another projector optics module coming
08:16 PM polprog: no idea what kind though but at that point any kind is cool
08:34 PM aandrew: polprog: congrats on the vault
08:37 PM polprog: thanks :)
09:28 PM aandrew: huh I bought these cheapish mpow H19 AEC BT headphones. these aren't actually bad, they're supposed to have decent mics too
09:28 PM aandrew: https://www.amazon.ca/gp/product/B07X85ZQLM CAD$75
09:28 PM aandrew: https://www.amazon.ca/gp/product/B07X85ZQLM CAD$75
09:53 PM rue_mohr: board A11
09:53 PM rue_mohr: 68020
09:53 PM rue_mohr: the error said 68k
10:35 PM aandrew: which scope is this rue_mohr
10:48 PM aandrew: over ear, CVC 8.0 so mics should be good
10:48 PM aandrew: bah
10:48 PM aandrew: wrong window