Author Topic: My Scratch Pad  (Read 96426 times)

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Offline MadScientist267

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Re: My Scratch Pad
« Reply #420 on: November 05, 2016, 06:56:33 pm »
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Wanted: Schrödinger's cat, dead and alive.

Offline MadScientist267

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Re: My Scratch Pad
« Reply #421 on: November 06, 2016, 08:47:20 am »
From memory, by reverse engineering and tracing, one seriously well built and readily hackable supply.

I won't be responsible for damage/misuse/injury/death/speeding tickets/invalid election results/hair loss... oh you know what I'm getting at.

Informational purposes only, use at your own risk, do not pass go, do not wash your dog with used motor oil, do bite your fingernails while following along, etc yada blah so on forth whatever and pffft. Do enjoy successful results.

Ahem, now then... ;D

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Offline MadScientist267

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Re: My Scratch Pad
« Reply #422 on: November 14, 2016, 11:42:48 am »
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Who said TO220 tabs are only good for getting *rid* of heat? ;D
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Offline bj

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Re: My Scratch Pad
« Reply #423 on: November 15, 2016, 05:18:03 pm »
  Just curiosity Steve, but what did you use for Epoxy?
"Even a blind squirrel will find an acorn once in a while"
bj

Offline MadScientist267

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Re: My Scratch Pad
« Reply #424 on: November 15, 2016, 05:23:54 pm »
JB Weld, but fear not, I was able to keep the leads out of it at least enough that it doesn't interfere (2 of the 3 are bound for grounded sinks). The other was most important, sits on a rectified mains negative side bonded sink... I gave that one extra attention to keep it out of trouble hehe (in the pic, the one on the far right)

All that said, using "authentic" tabs might have been more trouble than its worth for most... I needed something small, flat, and with a suitable hole already in it, then it hit me lol Dead MOSFETs! Haha

The casing pops off with relative ease and cleans up rather easily... the die on the tab that actually makes the transistor up, not so much lol Lots of fiddling only to end up with a somewhat rough and deformed surface on the mount side.

If I were to do it again, I might do it differently, but figured why not, it should work and they add a little spunk to an already spunky project lol
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Offline MadScientist267

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Re: My Scratch Pad
« Reply #425 on: November 15, 2016, 08:19:35 pm »
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Apparently time to upgrade my copy of the local version I have, wouldn't run online... Going to need this as part of the voltage steering on the new charger (and hopefully it's halfway accurate LOL hit and miss on these things)
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Offline MadScientist267

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Re: My Scratch Pad
« Reply #426 on: November 16, 2016, 11:04:00 pm »
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Offline rossw

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Re: My Scratch Pad
« Reply #427 on: November 16, 2016, 11:10:33 pm »
Well, I can see your problem there instantly :)

Offline MadScientist267

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Re: My Scratch Pad
« Reply #428 on: November 17, 2016, 01:23:01 am »
Yeah, cool huh? Just been one of those days... I'd still be chasing my tail had it not been for some help <wink wink>

With that little issue sorted out, the tests have been interesting and an LM317 will indeed tolerate 60V "input", provide 30V out, at 60mA (so far) without any real issues,  *almost* as pictured above... LOL One minor tweak...

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...much better :o

Part B of the test is to see where exactly it can't hack it anymore and lets all the magic fire and smoke out. I accidentally got a preview during part A, thanks to a touchy pot on the source supply... Saw the meter brush 80V briefly before I yanked it down... the regulator survived... lol

I've got some video of part A (with the cricket intermissions clipped out of course), and plan for the same when I go poking sticks to make it leak.

Stay tuned...
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Offline MadScientist267

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Re: My Scratch Pad
« Reply #429 on: November 17, 2016, 02:57:51 pm »
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Offline MadScientist267

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Re: My Scratch Pad
« Reply #430 on: November 17, 2016, 03:58:46 pm »
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Sometimes some really strange creatures grow when you put 2 different boards next to each other...
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Offline MadScientist267

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Re: My Scratch Pad
« Reply #431 on: November 26, 2016, 04:19:44 pm »
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Offline MadScientist267

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Re: My Scratch Pad
« Reply #432 on: November 26, 2016, 10:26:37 pm »
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Offline MadScientist267

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Re: My Scratch Pad
« Reply #433 on: November 30, 2016, 02:34:13 pm »
Theme must be schematics for now... Little bit of kit for Watt ;)

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Re: My Scratch Pad
« Reply #434 on: December 08, 2016, 04:07:17 am »
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If there's ever been a "too good to be true..." lol
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