#garfield Logs

Mar 04 2020

01:34 AM polprog: rue_bed: that oscillator is cool
01:40 AM polprog: high frequency thyristor. max current 100A, max repetitive peak voltage 600V
01:42 AM polprog: threshold voltage at t=110 deg C max 1.4V
01:43 AM polprog: im trying to work out a frquency limit of that thyristor
01:45 AM polprog: looks like on tme is 5 us, off time 1,5 us
02:16 AM polprog: yay, it works
02:16 AM polprog: https://twitter.com/polprogpl/status/1235110545608458240
07:19 AM rue_bed: hah
07:19 AM rue_bed: I dont know how easy it would be to recreate that circuit, its really touchy
07:20 AM rue_bed: the operable range on that gate adjust is about 0.6V
08:15 AM polprog: hmm, if i had an m20 nut i could try
08:46 AM * polprog reading about 1976 Teton Damn Failure
08:46 AM polprog: idaho
09:31 AM rue_mohr: hmm
03:25 PM Tom_L: i watch stuff like that on "Engineering Disasters"
03:36 PM polprog: thats quite an interesting story
03:37 PM polprog: there shouldnt be a dam there in the first place, geologists said so
03:37 PM polprog: but the congress won
03:40 PM Tom_L: https://www.youtube.com/watch?v=nQ0MyBg5h_A
03:46 PM polprog: i think i can connect to the thyristor with a metal hose clamp
04:28 PM polprog: hmm, no dice
11:47 PM rue_mohr: ok, well I made up a bender
11:47 PM rue_mohr: press brake?
11:47 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1150400.jpg
11:47 PM rue_mohr: spur of the moment thing
11:48 PM rue_mohr: polprog, I'm really intested if you can make that thing oscillate
11:58 PM polprog: me too, i suppose the thyristor is current controlled like bjts
11:59 PM polprog: so i might have to use a smaller value pot
11:59 PM polprog: also need some linear pots...
11:59 PM * polprog makes a shopping list