Author Topic: Keep or throw away ?  (Read 226 times)

Offline Thunderstruck

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Keep or throw away ?
« on: January 24, 2019, 11:21:11 AM »
Hello,
These components have been hanging around my workshop for a while.
They look like something that could be used for a cool project but some of them are complete mistery.
Image 1 - I thought these are large IGBT's but they are definitely not.
Images 2 and 3 - Large capacitor bank of unknown rating
Image 4 - another large cap

Please let me know if any of these are worth keeping

Yes, I know that the mouse can be used as a pointing device, it is there fir scale  ;D

Offline Hydron

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Re: Keep or throw away ?
« Reply #1 on: January 24, 2019, 12:27:52 PM »
Agree that the semiconductors are only good for scrap - look to be BJTs rather than IGBTs.

As for the capacitors, the last one is worth keeping, the bank might be but is difficult without knowing the rating. If you can measure the physical size of the mystery caps and their capacitance then you may be able to get a ballpark voltage rating though (through comparison with other capacitors of the same size and capacitance), and potentially confirm it by charging them up to the estimated voltage through a current limited supply - if the leakage remains low then they are probably useable at that voltage.

Offline Mads Barnkob

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Re: Keep or throw away ?
« Reply #2 on: January 24, 2019, 12:49:29 PM »
I agree with Hydron on this one.

The power transistors are only good for a paper weight, tech display or selling the copper base for scrap money. I attached a datasheet for the series of Fuji switches.  Even if it was IGBTs they would have a horrible slow switching speeds, low peak current specifications etc etc.

You should search for "capacitor reforming" to get a guide on how to revive old electrolytic capacitors and get an idea of their performance. The last one looks newer than the other, so I would assume that is still in the good end, but could properly need reforming aswell.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Thunderstruck

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Re: Keep or throw away ?
« Reply #3 on: February 07, 2019, 11:27:44 AM »
Thanks for the info, next up, we have some legless components

3 x G40N60UFD Ultra Fast IGBT
2 x F30U60DN Ultra Fast Recovery Rectifiers

Are these any good for SSTC ? With this much speed I’ll be surprised if they aren’t !!
They test OK, and yes I know they should live in an anti static bag  ;D, which they do.

Offline Mads Barnkob

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Re: Keep or throw away ?
« Reply #4 on: February 07, 2019, 12:16:31 PM »
There are people that have successfully built SSTC with IGBTs, but IGBTs are really better suited for a DRSSTC.

So your little silicon stash here is perfect for a small half-bridge coil.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Thunderstruck

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Re: Keep or throw away ?
« Reply #5 on: February 07, 2019, 12:20:52 PM »
Excellent ! Thanks for the info.
DRSSTC is a bit too complex for me right now, i need to get my simple SSTC working first, then hopefully I can move onto something more challenging.

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Re: Keep or throw away ?
« Reply #5 on: February 07, 2019, 12:20:52 PM »

 


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