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Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Hi guys, I’ve just made a very painful and expensive experience. I left my plastic box with my collection of power mosfets lying on the table (btw. as usually…). Recently I finished small SGTC powered by fly-back and played a lot with this small beast. Unfortunately, probably the RF and EMG pulses from this stupid little coil destroyed all the FETS in the box! They are all dead in a very funny way. By simple measurements using a multimetr all looks fine, but in reality they are all like half open. It means all the transistor conduct 1-3A between drain and source without connected gate.
The death list: IRFPC60 – 4pc 2SK3304 – 6pc In total 10pc of dead FETS without any effect…I hate the world
At least sending a picture of the killer in action…
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Did you try shorting the gate to emitter then apply some collector voltage? This happened to me with some transistors, these things can hold gate charge a for a long time.
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Plasmaddict wrote ...
Did you try shorting the gate to emitter then apply some collector voltage? This happened to me with some transistors, these things can hold gate charge a for a long time.
just to give you some hope...
Nice try but it didn't work. Now, I can use the transistors only as non-inductive power resistors If somebody has a use for such componenets I can produce them in large scale God, I'm so angry!!!!
Registered Member #1083
Joined: Mon Oct 29 2007, 06:16PM
Location: Upland, California
Posts: 256
Dang, that sucks massively! I have this electronic game in one of my plastic storage drawers (no idea why it's in there), and every now and then when I turn off my mini magnifier coil, the game will randomly start up. The drawer is about 8" from the cord running to my power strip, so there must be a pretty big RF field around the power cord. I even have a line filter, but it still does it sometimes. There must be a tiny EMP that occurs when I suddenly switch off the coil which is just big enough to create a voltage on the transistor that turns the thing on. Rarely, the garage door opener light will come on as well.
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All stored transistors are dead! The killer: SGTC
If somebody has a use for such componenets I can produce them in large scale 
God, I'm so angry!!!!
. Otherwise nice looking coil.
