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Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
playing with a self oscillating resonant smps on a breadboard:
first i got the feedback winding phased wrong, and i decided to let it burn for a while. the white ash/plastic stuff goes all the way to the die.
after i was getting 24v dropped across my 10 ohm dummy load, i just put a led in its place to test current flow. red flash... bang! the missing side was facing me(ouch). knowing now that it worked, i swapped the open circuit resistor for a good one, and it was able to smoke 1W's in seconds
I have destroyed a few 555s before, but none of them had too spectacular an asplosion or destruction. I did, this once, find a tiny Pikachu toy that I have no idea what it did, because for a long time, it sat in my room, not working. (it was a plastic one, not one of those adorable fluffy ones that talk) I had no idea the polarity of the thing, so I guessed, and I guessed wrong. I then learned what pikachu would smell like if his thunderbolt went the wrong way. I kept the toy, but it smelled of magic smoke for a really long time. I have no idea where i kept the circuitry of it.
When I was making my boost converter, I suppose the 1M dropping resistor failed, sending 400V into the comparator, which failed short, and sent 400V straight into this 555...
Haha I had exactly the same thing happen to me when I was prototyping mine the dam thing jumped right off the breadboard and tryed to kill me LOL
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
Used to work in electric fencing - wish I had pics of some of the lightening damaged ones! Generally no copper left on the pcb, and lots of loose burnt things lying around in the case.
Registered Member #3792
Joined: Sun Mar 27 2011, 06:07PM
Location:
Posts: 136
Got a microwave oven from the electronics recycling. Externally was in good condition and no electronic component inside had any visible damage. Until i decided to get the magnetron tube out:
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pics of blown Electronics.
