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Registered Member #3108
Joined: Thu Aug 12 2010, 05:37PM
Location: Worthing, England
Posts: 72
I have killed loads of semiconductors already, but rarely have them to fail dramatically
Heres two mosfet that exploded, and the one with an resistor on it made a heck (and I mean alot!) of smoke!
Sometimes my semiconductors gets mixed up with others - I picked out "assuming it was a mosfet and didn't bother reading the part no." from the bag of mosfets. I then connected to the drive circuitry and BAM! It turns out to be a voltage regulator...
A while ago, I was hoping to blow up a flash tube with my large cap bank for fun, but something a little more interesting happened...
Registered Member #2909
Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145
well I was going about testing my new volt meter on my bank power supply which according to the volt meter puts out 1.2kv ac it work great even over the max volts of 750v until I turn it off in it flicker back on an cause a voltage spike that killed the meter, oddly it dint burn out the fuse and arc to a little copper rail and killed thee little things on the board and fried the contacts, so no more volt meter
not to self dont go over max volts on a meter and leave it plug in to a trasformer
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Meters have fuses and the fuses have voltage ratings and the best meters have fuses with interrupting capacity in kiloamps on the fuse. But the reason for these fuses and the ratings on the meters is to guarantee they wont explode if used within the rated maximum voltage . High voltage, especially high frequency high voltage is rated with a frequency/voltage derating curve.
But all this aside, spark voltages dont care about fuses.
If you arc-over a meter whether or not it will explode into bits, in you face depends on how much energy the circuit can furnish.
I have toasted my share of expensive instruments, happily most were not mine own property. I am also aware of a Scopemeter that died whilst measuring the trend on a big SCR drive, however I was not close enough to be blamed.
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Does a blown trace count?
I used an etched board for my 30 flash capacitor bank. This was near the positive connection, to my ring launcher. I charged it to 200V, after the 5th time, i heard a poof. Then I charged to 200V again, the SCR wouldnt fire. Discharged with a power resistor, and came to find my trace exploded! This is the reason I'm going to thick aluminum busbars!
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pics of blown Electronics.
and arc to a little copper rail and killed thee little things on the board and fried the contacts, so no more volt meter 
