@ftg@mastodon.radio
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ftg

@ftg@mastodon.radio

Radio/Electronics/Telecom Geek.
He/him.
youtube.com/oh2ftg
prkele.prk.tky.fi/~ftg/
twitter.com/2ftg1

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niconiconi, to Electronics

Parasitic and ESD diodes that don't officially exist are everywhere in semiconductors, so almost all chips have on-die temperature sensors if you abuse them carefully enough. How does the 1970s US military measure junction temperature in mighty MIL-STD-883 - remove power, and immediately (within microseconds) capture the substrate/body/ESD diode bias voltage in a sample-and-hold circuit before it cools down. Great accuracy. Analog Devices retested the idea recently and found it still works great today. https://www.analog.com/en/analog-dialogue/articles/esd-diode-doubles-as-temperature-sensor.html

ftg,
@ftg@mastodon.radio avatar

@niconiconi
I recall reading about some oven heater (as in crystal oven, not the baking kind) heaters circuit that used a BJT power transistor for both heating and measuring the temperature.
Only repeatability truly mattered, not the ppm's. So it worked for it.

astrid, to random
@astrid@fedi.astrid.tech avatar

Oh no I found a FB marketplace listing for a $100 42u rack and I am way too tempted to buy it

ftg,
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@astrid
Racks suck.
Never again.

I had a full size rack in my student flat that I got for free.
It sucked hauling up the stairs.
And it sucked more hauling it back down the stairs when I moved.
And it took ages to give away as I did not want it in the living room of my new flat.

ftg, to random
@ftg@mastodon.radio avatar

Who would be some interesting technical folks to add to my follows?
Interested in ham radio homebrew, microwaves, RF, high speed digital, electronics in general and stuff like folks building their own linux SBC's.

gsuberland, to random
@gsuberland@chaos.social avatar

my dad came to visit today and we were chatting about electronics, and I said "oh what's that really expensive connector manufacturer?" and before I even got the last syllable out he said LEMO (who are exactly who I was thinking of)

ftg,
@ftg@mastodon.radio avatar

@gsuberland
Hah. Reminds me of designing an adapter board for a scientific thing that had a hermetic connector.
Not LEMO tho, only ~150eur/pcs for the plugs.
But the catalogs and datasheets ware so trash that it was impossible to tell with 100% certainty if the plugs we could find on Farnell would mate with the chamber.
So they salvaged the connector from some older instrument instead.
Not to save money, but to get certainty (and to avoid buying a handful of 150 - 180eur connectors to test).

gsuberland, to random
@gsuberland@chaos.social avatar

hear me out: ribbon cable, but every wire is coax

ftg,
@ftg@mastodon.radio avatar

@f4grx @AMS @gsuberland @notpike
Other than SATA cables not having a twisted pair, they just run side by side.
Just some shielded twin lead.

ftg, to random
@ftg@mastodon.radio avatar

Got this chonker on the chipping block.

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