#garfield Logs
Mar 16 2020
#garfield Calendar
12:46 AM rue_bed: it would be nice to play with some of the more common circuits for rx/tx too
04:12 AM polprog: i should go back to my rc barge project
04:12 AM polprog: i have everything but the remote control part
04:14 AM polprog: there is a fort with a moat near me
04:14 AM polprog: and theres some water in the moat, judging by the width of it it's about waist deep at most
04:15 AM polprog: so it would make a great test area for that boat thing
04:15 AM polprog: i plan to put various measurement thingies on it, temperature, sounder, whatever
04:15 AM polprog: i was thinking about a mangetometer as well
04:18 AM polprog: i need to rearrange the bench
04:19 AM polprog: the scope can't sit on the industrial PC, since its effectively behind me when i sit close to the edge
05:40 AM polprog: aw, scre it
05:40 AM polprog: ill just try to put it there and see if its comfortable
05:53 AM polprog: i am starting to think that my bench is too small
06:44 AM polprog: ok, i managed to fit all the stuff on it
06:44 AM polprog: and i actually have more space than before
06:45 AM Tom_L: mmm.... add more stuff = more space...
10:20 AM polprog: i rearranged the stuff, siemens analog scope and the tek waveform monitor went to the windowsill
10:20 AM polprog: just need to find out where to put the video monitor
10:40 AM Tom_L: mount it to the wall
10:51 AM polprog: too bad its a 15" crt
10:52 AM polprog: i guess it will go into the wardrobe
01:11 PM polprog: so im bulding a larger version of my osc
01:11 PM polprog: turns out the gate current here is 9A peak
01:11 PM polprog: 9V on 1R resistor
01:11 PM polprog: thru a zener diode
01:11 PM polprog: not good
01:16 PM polprog: 793mV/15R = 52mA
01:16 PM polprog: thats better
01:17 PM Tom_L: phew
01:17 PM polprog: i had a feeling to put a resistor there
01:52 PM polprog: so its possible
01:52 PM polprog: but the resistors i have are too small powerwise
01:52 PM polprog: id have to heatsink them, or get some heasinkable
01:53 PM polprog: the value of the anode resistor seems to be in range around 47R
01:53 PM polprog: 100R is too big, 15R is too small i think
01:53 PM polprog: and it runs from 10V
02:45 PM polprog: weird
02:45 PM polprog: the anode resistor should never be too big
02:45 PM polprog: i think
02:46 PM polprog: it should be the capacitor current that triggers the gate
04:14 PM polprog: weird
04:14 PM polprog: this thing has holding current given as 100/200mA
04:14 PM polprog: wtf
04:14 PM polprog: gate current min 150mA
04:14 PM polprog: useless
04:14 PM polprog: however it oscilaltes sometimes
04:17 PM polprog: this math leads to nonsesne
04:17 PM polprog: 27 < R < 4.8
04:17 PM polprog: yet it oscillates with 47ohm at the anode
04:21 PM polprog: hmm
04:22 PM polprog: maybe i took the wrong figure
04:23 PM polprog: arrr
04:23 PM polprog: i think i did take the wrong figure
04:24 PM polprog: now this makes sense
04:24 PM polprog: 36 < R < 48
04:24 PM polprog: oscllates at 47
04:25 PM polprog: doesnt oscillate at 62
04:30 PM polprog: ive worked out the maths and i forgot how it works
04:56 PM polprog: well
04:56 PM polprog: the datasheet is BS. the actual gate trigger current is 50mA
04:56 PM polprog: and now it works out. R must be in range (27oh, 48 ohm)
05:15 PM polprog: https://polprog.net/rozne1/ircjunk/thyrosc2/power_thyrosc.png
05:19 PM polprog: https://polprog.net/rozne1/ircjunk/thyrosc2/power_thyrosc_build.png
05:19 PM polprog: goodnight
05:20 PM polprog: stuck on at delta Va-g = 137mV
06:58 PM rue_mohr: heh
06:58 PM rue_mohr: how to know your stuck at home today ;)
06:58 PM rue_mohr: our electrical office closed toe door today" go away, phone us"
06:58 PM rue_mohr: then the book keeper put the phones on night mode
07:05 PM Tom_L: you gettin days off then?
07:15 PM rue_mohr: no were still working
07:15 PM rue_mohr: just no walk in puiblic
07:15 PM rue_mohr: the electrical supplier said to NOT enter their warehouse
07:15 PM rue_mohr: usually, they are so slow at helping, I get eveything and put in on the coutner
07:16 PM Tom_L: so what if you need something now?
07:16 PM Tom_L: i was off today
07:16 PM Tom_L: and probably tomorrow
07:17 PM Tom_L: i may take a few on
07:17 PM rue_mohr: ask for it at the counter
07:17 PM rue_mohr: we watied 10 minutes for someone to be available
07:17 PM Tom_L: well the whole world is on hold now
07:23 PM rue_mohr: just about
07:33 PM rue_mohr: yea, its starting to have an effect around here tho for sure
07:33 PM rue_mohr: and in the meantime I'm fighting off that stupid thing that messes with me ever year
07:35 PM Tom_L: short on TP and water?
07:35 PM Tom_L: practically non exhistent here
07:35 PM rue_mohr: pff
07:36 PM rue_mohr: tap water is fine here
07:36 PM rue_mohr: and a week ago I did my normal tp restock
07:36 PM Tom_L: yeah
07:36 PM rue_mohr: I'm kinda worried about my normal groceries tho
07:36 PM rue_mohr: I'm gonna restock a bit early as I dont know how long it'll take me to get things
07:37 PM Tom_L: that's what makes it hard for the normal ppl
07:39 PM rue_mohr: yep
07:39 PM rue_mohr: I hope I dont have to start killing eating deer
07:39 PM rue_mohr: dont like meat
07:39 PM rue_mohr: I have the ONLY video on making tp
07:40 PM rue_mohr: on youtube
07:40 PM rue_mohr: only 3 views
07:40 PM rue_mohr: so, its not an issue yet
07:41 PM Tom_L: :)
07:43 PM rue_mohr: you saw the castings eh?
07:43 PM Tom_L: yeah i forgot what you said they were though
09:32 PM rue_mohr: ok, I finished sleeping
09:38 PM Tom_L: so what now?
09:38 PM rue_mohr: yea
09:38 PM rue_mohr: not sure, makin some food
09:38 PM rue_mohr: so, are things getting quiet over there?
09:39 PM Tom_L: yeah alot fewer out and about
11:18 PM rue_shop1: ah, there's a problem
11:18 PM rue_shop1: (working on my filter profiler again)
11:50 PM rue_mohr: zhanx_laptop, you alive? are you infected!!!!
11:50 PM rue_mohr: :)
11:50 PM rue_mohr: how many arms do you have!
11:50 PM rue_mohr: thats the sure way to know!
11:56 PM rue_mohr: urrent is: 400.000uA
11:56 PM rue_mohr: Voltage is: 2.000mV
11:56 PM rue_mohr: Resistance is: 5.000Ohms
11:56 PM rue_mohr: I actually didn't expect 2mv