I attempt to repair a damaged psu at 10pm with “optimistic” results. This is actually the second evening; the first being for dismantlement, case modification, and re-soldering.
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Computer System
I attempt to repair a damaged psu at 10pm with “optimistic” results. This is actually the second evening; the first being for dismantlement, case modification, and re-soldering.
part 2
Well, the caps weren't holding a charge so I foolishly removed the resistor AND 2 amp fuse, and plugged the cord in. One capacitor shorted internally @100V and the resulting electrical fire, blown diodes, and crispy wiring stunned me so much I felt no fear despite my face being, as in this video, so close.
@MrSoundshark A couple years ago I removed the mains capacitors from a PSU (for a coilgun) and charged them directly from a wall socket through a 220 ohm resistor. The 200V caps were connected in series to be charged with a 2-diode voltage doubler to 340V.
@DoctorStalker1 at least you get some nice parts to play with out of it 🙂
@MrSoundshark
The wire is actually coated with enamel insulation or something similar so I wasn't too worried. Had the repair been successful, I would have encapsulated the wire with shrink tubing.
A variac would have been a good thing to use at the time, but I haven't gotten around to ordering one yet, nor need one often. Plus, risk (and sparks shooting everywhere) is sometimes fun.
Nice vid.
Are you not concerned with the return live being unsheathed? also i tend to bring them up to voltage using a variac to avoid losing my eye brows 🙂 but every fail is a step closer to a repair.
@Alex1M6 Some time ago a ceiling light burned out and really popped. I was partially blinded my heart rate doubled. The transistor frying was 50% expected but I still put my face kind of close. 🙂
I had a desk lamp do that to me the other day, my face was directly over the bulb when I turned it on the element instantly went pop and the fuse (all our plugs have fuses where I live) went too. I know it was only a light bulb but I was not expecting it and it made me jump lol.