#garfield Logs

Nov 26 2021

12:12 AM ruenahcmohr: oh look at this cool SCR oscillator I found on the internet!!
12:21 AM ruenahcmohr: https://polprog.net/blog/thyrosc2/schem2.png
12:21 AM ruenahcmohr: :) ahaha
12:21 AM ruenahcmohr: now, did you know that if you tap the gate with a transistor you SHOULD be able to get little pulses out of it while it resets?
01:32 AM ruenahcmohr: oops, its not an SCR, its a
01:33 AM ruenahcmohr: PUT
01:50 AM ruenahcmohr: https://www.electroschematics.com/wp-content/uploads/2009/06/signal-generator.gif?fit=500%2C199
01:50 AM ruenahcmohr: polprog, ^^^^^ what!?
02:15 AM polprog: ruenahcmohr: where did you find the rectifiers book :)?
02:15 AM ruenahcmohr: I dont know :(
02:16 AM ruenahcmohr: there is so much going on right now that I cant remember where any of it comes from
02:16 AM polprog: Ahh fair
02:16 AM polprog: Same herr
02:16 AM polprog: Here*
02:16 AM ruenahcmohr: its cool tho eh?
02:17 AM polprog: Its pretty awesome yea!
02:17 AM ruenahcmohr: I have 6 books up right now, I'm not even sure what they all are
02:17 AM ruenahcmohr: those magazines are pretty cool
02:17 AM polprog: I just wish i didnt have all that much to do
02:17 AM ruenahcmohr: :)
02:18 AM ruenahcmohr: I accidently found like 6 more oscillator circuits to try
02:18 AM polprog: Aaaaa
02:18 AM ruenahcmohr: I suppose I'll be busy this weekend
02:18 AM ruenahcmohr: that charge pump freq divider is super super cool tho
02:19 AM ruenahcmohr: I searched like crazy for charge pump circuits and couldn't find anything that was real
02:19 AM polprog: what freq divider?
02:19 AM ruenahcmohr: heh
02:19 AM ruenahcmohr: your missing the good stuff
02:19 AM ruenahcmohr: <ruenahcmohr> http://ruemohr.org/~ircjunk/tempimage/p1210860.jpg
02:19 AM ruenahcmohr: <ruenahcmohr> http://ruemohr.org/~ircjunk/tempimage/p1210861.jpg
02:19 AM ruenahcmohr: <ruenahcmohr> http://ruemohr.org/~ircjunk/tempimage/chargePumpFreqDivider.png
02:19 AM ruenahcmohr: and see twitter
02:20 AM ruenahcmohr: you usually catch my posts in about 8 hours from now
02:20 AM ruenahcmohr: my morning polprog
02:20 AM polprog: Yeah
02:21 AM polprog: Very clever circuit tho
02:21 AM ruenahcmohr: the key is that 2nd transistor, its like in a fet driver, but its backwards
02:21 AM ruenahcmohr: which is crazy, but I understand it
02:22 AM polprog: Tr2?
02:22 AM ruenahcmohr: yup
02:23 AM ruenahcmohr: the diode lets thru the pump charge, but blocks the recharge
02:23 AM ruenahcmohr: the transistor allows for recharge current
02:23 AM ruenahcmohr: :) mind blown
02:23 AM polprog: ill have to think about it
02:24 AM ruenahcmohr: I want to stick one on an LM3914 too
02:24 AM ruenahcmohr: to break it out to 10 leds
02:24 AM ruenahcmohr: maybe a diode rom and a 7 segment for some fun
02:24 AM polprog: It would be pretty cool
02:26 AM ruenahcmohr: https://www.homemade-circuits.com/wp-content/uploads/2020/08/relaxation-oscillator.jpg
02:27 AM ruenahcmohr: hey thats mimms
02:27 AM ruenahcmohr: wtf, I'v never seen the book thats from
02:28 AM polprog: yeah thats mimms
02:28 AM polprog: Ok gotta go make breakfast
02:28 AM polprog: or go back to sleep
02:28 AM polprog: Idk
02:28 AM ruenahcmohr: ahhahaha
02:29 AM ruenahcmohr: make oscillators, and analog counters
02:29 AM ruenahcmohr: then decoders, and encoders
02:31 AM ruenahcmohr: I'm still in search of the illusive single bipolar low frequency oscillator
02:31 AM polprog: Analog counter hmm
02:31 AM polprog: Ok, i have to go back to bed
02:31 AM polprog: Just need and hour sleep more
02:32 AM ruenahcmohr: heh, good luck
02:32 AM ruenahcmohr: omg its midnight
02:32 AM ruenahcmohr: I had to be asleep an hour ago
02:32 AM ruenahcmohr: DAMN INTERNET
11:00 AM polprog: replacing the mains cable with a grounded one in that soviet TV
12:18 PM aandrew: so I got this long IR shoulder heating pad
12:18 PM aandrew: because I have developed this nasty sprained/pulled/stiff/wahtever muscle from sitting and working too long
12:19 PM aandrew: and I noticed a hot shower really seems to help
12:19 PM aandrew: this thing has a long cable on it which is nice, but means I'll be running over it constantly with the chair
12:19 PM aandrew: and best of all
12:19 PM aandrew: the connector on it is a barrel jack with the plastic twist-lock on it, so if I forget about it I stand a real good chance of pulling half the shit off my workbench
12:20 PM aandrew: funnily enough this is not the shoulder I fucked up when I was 17 and (literally) ran into a tree with
12:22 PM aandrew: I'm gonna see what's involved in replacing the power adapter with a lipo pack
12:31 PM aandrew: 24V 1.25A is what the adapter's good for, so 25W should be plenty. I have some bigger packs, 5200mAh 4S 10C rated, and judging from the wire/connector coming off it that 5.2Ah *is* the 10C rating
12:33 PM aandrew: so 5.2A * 15V is 78W, I only want to draw 1/3 that... hmm
12:34 PM aandrew: 25/15
12:34 PM aandrew: er
12:35 PM aandrew: very rough back of napkin guess, about 3h out of that battery, not bad, the pad has a fixed 4h max timer anyway
01:47 PM polprog: Lipo pack that sounds good :)
01:48 PM polprog: Ever since I build the 3S pack with a chinese BMS and it didnt blow up, i have an urge to put batteries in every device
01:48 PM polprog: especially that I have two more 3S li-ion packs
01:51 PM aandrew: :-)
03:51 PM polprog: https://twitter.com/polprogpl/status/1464324575014101014
04:51 PM Tom_itx is now known as Tom_L
05:32 PM ruenahcmohr: ah yes I saw!
06:08 PM ruenahcmohr: damn polprog 92 likes on that staircase generator!
06:15 PM ruenahcmohr: 1941 followers...
06:15 PM ruenahcmohr: I think it went down, but strange things are happening, so it might be unstable
06:20 PM polprog: :)
06:20 PM polprog: Good job!
06:23 PM ruenahcmohr: I'm gonna have to throw a thing when I hit 2048
06:23 PM ruenahcmohr: but numbers are meaningless, so
06:24 PM ruenahcmohr: I have about 5 more circuits
06:24 PM ruenahcmohr: I'm kinda dead right now, I need to sleep it off
06:25 PM ruenahcmohr: I want to play with the charge pumps!
06:27 PM ruenahcmohr is now known as rue_mohr
06:32 PM rue_mohr: I had my B complex, its not working this week
07:23 PM Tom_L: :/
10:35 PM rue_mohr: 8pm!?
10:35 PM rue_mohr: ok, I'm awake
10:51 PM Tom_L: is it day or night?
10:53 PM rue_mohr: night
10:53 PM rue_mohr: thought it said 8am
11:02 PM Tom_L: all that's left is to hang the shower doors
11:02 PM Tom_L: milled the frame ends so they're a nice snug fit
11:02 PM Tom_L: they didn't specify a cnc mill in the directions for tools needed
11:13 PM rue_mohr: wow 1946 already, this is a steep climb
11:14 PM rue_mohr: good work tom,
11:14 PM rue_mohr: was it a bathroom before? its new isn't it?
11:14 PM Tom_L: it was
11:15 PM rue_mohr: heh ok
11:15 PM rue_mohr: well its 8pm
11:15 PM rue_mohr: I better get up and do something
11:16 PM rue_mohr: supper is on the list...
11:16 PM Tom_L: time to kick back
11:16 PM Tom_L: been on that pretty much all day
11:17 PM Tom_L: had leftovers
11:19 PM rue_mohr: 9pm!
11:19 PM rue_mohr: that wasn't an hour!!!
11:20 PM Tom_L: careful, it will be next year before you know it
11:24 PM Tom_L: you know it's funny, we live by time and a schedule but our brain doesn't record time. it records events
11:27 PM rue_mohr: :)
11:28 PM rue_mohr: https://twitter.com/RueNahcMohr/status/1464101623186165761 <-- 104 likes on that, which is crazy
11:28 PM rue_mohr: not sure why its so popular
11:29 PM rue_mohr: https://twitter.com/plastic_gear/status/1464453709119692804
11:30 PM rue_mohr: ^^ check that out if it'll play, the team has been doing stuff for a few years, but I lose track of them every so often
11:31 PM rue_mohr: silly sure, but pretty grand