#garfield Logs

Jun 01 2021

01:13 AM polprog: rue_mohr: what level meter?
01:20 AM rue_mohr: https://archive.org/details/funway_into_electronics/funway_into_electronics_vol_2_5th_printing/page/n97/mode/2up
01:20 AM rue_mohr: I think those transistors could all be swapped out with a ULN2803
01:39 AM rue_mohr: could make a 3 or 4 bit with 1/2 chips
01:50 AM polprog: ah that
01:50 AM polprog: yeah, i even made one with a hct14
01:51 AM polprog: https://twitter.com/polprogpl/status/1325544406930350083
02:55 AM rue_bed2: thats why I mentioned it
02:55 AM rue_bed2: but the lack of schmitt increases the resolution
02:55 AM polprog: yes, the idea with a diode chain is pretty neat
03:31 AM polprog: ok. feels weird to have noting to do
03:31 AM polprog: i think i am forgetting something
03:31 AM polprog: Kiwa got a soekris, damn. These are cool
03:31 AM polprog: I should play with PXE
04:23 AM polprog: stupid surepos
04:24 AM polprog: the power supply needs to be fixed up. Im sure the caps are dead
04:24 AM polprog: it cuts out on boot at random
04:24 AM polprog: seems to go away when you open the chassis
04:24 AM polprog: it's a mess
04:24 AM polprog: not going to touch it for now. i should focus on the exams
08:43 AM rue_mohr: https://twitter.com/wdko/status/1399645105322029056/photo/1 ?
09:42 AM rue_mohr: hmm, the uln2803 idea might not work out that well, its got a higher threshold (higher than 0.7V)
09:44 AM polprog: hmm, i wonder whats that feedback loop on the opamp
09:44 AM polprog: the HC series have quite good bandwidth, 80MHz
09:44 AM polprog: thats the GBP
09:44 AM rue_mohr: thats quite similar to the thresholding thing I was playing with
09:45 AM rue_mohr: but, I'd like to see how theirs does, cause its got a twitst I cant quite work out
09:45 AM polprog: that could be the output circuit compensation...
09:46 AM polprog: sample and hold makes a nice audio effect
09:47 AM rue_mohr: https://archive.org/details/funway_into_electronics/funway_into_electronics_vol_2_5th_printing/page/n119/mode/2up
09:47 AM rue_mohr: interesting...
09:47 AM rue_mohr: are they using the carbon to bind paint to?
09:48 AM rue_mohr: no time to read it now
10:05 AM rue_mohr: wtf, my thingiverse thing went missing
10:08 AM rue_mohr: or not what the heck
03:56 PM polprog: losing things in the virtual space now?
03:56 PM polprog: i can feel that
03:56 PM polprog: been there
04:44 PM rue_mohr: https://www.thingiverse.com/thing:4874924 <-- see that...
04:44 PM rue_mohr: https://www.thingiverse.com/rue_mohr/designs <-- its not in there, is it?
04:47 PM polprog: dont see it there
04:47 PM polprog: strange
05:01 PM rue_mohr: yea
05:01 PM rue_mohr: wtf
05:16 PM polprog: i should get a metallurgical microscope
05:16 PM polprog: but first i should get a flat and a steady stream of income
05:22 PM polprog: you should collect these 4066 shoot through scpope traces and corellate them with https://twitter.com/polprogpl/status/1330962474284232705
05:23 PM polprog: that would make a nice page
05:27 PM rue_mohr: each of those images has the chip P/N in the name
05:28 PM rue_mohr: I can forward them to you if you would like
05:28 PM rue_mohr: only the SSS4016 had no shoot thru
05:41 PM polprog: i dont have many 4066 (still didnt buy any, maybe ill remember)
05:41 PM polprog: i coul put something together
05:41 PM polprog: i took some photos of the laspi generator today
05:41 PM polprog: the test card one
05:41 PM polprog: so i could make a page on that and on the shoot thru
05:41 PM polprog: :)
05:41 PM polprog: sss4016?
05:43 PM rue_mohr: yea
05:43 PM rue_mohr: not sure who that is
05:58 PM polprog: laspi is the company who made that russian test card generator i was fixing up recently
05:58 PM polprog: if thats what you mean
07:44 PM Tom_L: yay, mill holders arrived
07:59 PM aandrew: rue_shop5: that's an interesting idea
07:59 PM aandrew: 2x5 inside a DB9
10:28 PM rue_shop5: you can jam dupont connectors into the device on the bench