Weird and interesting fault
Added 2023-06-16 21:38:30 +0000 UTCI fear the bean counters may have struck again and made a poor component choice on a fairly high profile looking controller.
But the best bit of this diagnosis was a weird and inexplicable overheating fault which had a very unexpected cause.
https://www.youtube.com/watch?v=QLkE-XxMtKw
Comments
That's why the modern ones have such a hard time with the high frequency power supplies. They have to use a special low resistance (Lo ESR) electrolyte to reduce heat dissipation and allow them to store the bursts of current.
Big Clive
2023-06-22 04:18:03 +0000 UTCThere's always more to learn! I didn't have any idea about electrolytic capacitors being heated by the ripple current flowing in and out of them. It makes perfect sense now that I think about it, but I never thought about it before. And that toothpick hack is genius!
Circuitmike
2023-06-21 17:56:38 +0000 UTCNow this is a classic Big Clive video. It's great - explaining what the problem is and then guiding newbies through the simple repair. Excellent.
Jon Knight
2023-06-17 16:32:37 +0000 UTCBigClive - explicating the inexplicable since... forever!
Curtis Hoffmann
2023-06-17 09:09:48 +0000 UTC100 deg C is warm, but that's in air and the junction won't be much hotter. Actually I've just checked and TO-126 have poor junction to case thermal resistance. It could be marginal. But we are talking about a fault condition.
Mike Page
2023-06-17 08:10:04 +0000 UTCThe toothpick trick for clearing through holes sounds like a great hack. I'm always struggling with clearing holes plugged with solder, so I'll definitely add some toothpicks to my bag of tricks. Thanks!
Mark Warburton
2023-06-17 05:32:58 +0000 UTCInexplicable until I reverse engineered it to find out why.
Big Clive
2023-06-17 05:06:39 +0000 UTC"What was the fault?" "I dunno, it's inexplicable."
Curtis Hoffmann
2023-06-17 04:11:54 +0000 UTC
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