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Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
i was showing off my OBIT to a friend, i went to ajust the Jacobs ladder because it wasnt working and the switch came back on after i had turned it off, the spring in it was messing up, thank god i heard it..
Always unplug HV electronics before you go to touch it :x
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
Indeed, thats a wise thing to do. I've done this before with a mains transformer, took it apart while still plugged in aged about 14. Guess what, no shocks but noticed that the transformer was still buzzing and realised before touching anything live.
Also had a NiMH battery short out on my desk, that scared the hell out of me. Must have been metal swarf between the casing and +V, because it damn near glowed white hot before it went out of the window.
Fried my first power fet today. I've always been super careful with them when it comes to ESD and Thermal overload.. but this was the first time I've used one for a Tesla Coil... once I saw the output my excitement made me lose track of time and I cooked it! I had it on a small TO-220 heatsink which should have kept it cool for about 10 seconds I figured. Well, I didn't realise what I had done until the magic smoke came out. IRFP460 in the grave because I was staring at my SSTC with slack-jawed enthusiasm.
Thankfully I had the forethought to order more than I needed and I have 2 spares. New one is being thermal epoxied on to a much larger heatsink as I type this.
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Stupidest Mistake
