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Registered Member #3930
Joined: Sun Jun 05 2011, 07:27PM
Location: Sydney, Australia
Posts: 33
Light chaser circuit. 3 channels, different patterns, quite a few IC's, driving those 100-150 watt mains floodlights as disco lights.
During faultfinding a tired me forgot to unplug as I went to solder a setting jumper in place. Just about every semiconductor on the PCB exploded as mains electricity made a run for the earthed soldering tip (and here in australia its 240V mains).
Of course I copped a few shrapnel scratches, and my ears were ringing for a while, but thank god I was wearing saftey glasses!
Stunk my bedroom out too - fried IC's really tend to stink.
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
as i was reading arcstarters post, i just noticed something i must of done earlier: i guess i was soldering over my breadboard and dropped some solder on it. i'll never be able to use hole G-63 again.
Registered Member #242
Joined: Thu Feb 23 2006, 11:37PM
Location: Erie PA
Posts: 210
Was building an inverted pendulum for my advanced digital circuits final project. It was a bit of a scramble, had to build everything from scratch, and only ~2 weeks to do it. We just got the motor to start turning with a simple PI regulator, we were watching the pendulum move, then it suddenly stopped. Look over at the breadboard to see the little cat-5 jumper wires glowing red hot. Both fets shorted in a leg, shorting out the ~45Vdc.
the +/- strip is shorted, and all the melted sections made a good portion of the breadboard unusable. Using a fuse could have prevented this. Although I probably would have run out of good fuses and had to wrap it with AL foil.
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
just made over 50ft of litz wire to use for a transformer, but i don't have a core big enough to fit 90+ turns on. well except for a giant toroid, are toroidal transformers any good?
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Forty wrote ...
just made over 50ft of litz wire to use for a transformer, but i don't have a core big enough to fit 90+ turns on. well except for a giant toroid, are toroidal transformers any good?
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042
I was testing my underwater ROV's electronic controls on dry land before water tests, (seen in the project section) and I got a phone call. Instead of turning the power switch (which used a key hence any thought at all), I took the call and came back, after realizing it had been twenty minutes, to a ruined 1000 GPH Bilge Pump from running it dry for a long time. I also depleted my already very low SLA to the point where I never did get a good charge out of it again, so I had to get a new battery
Lesson learned, but the project is going to get a complete overhaul once I can fund it, maybe my university will or I could get a local defense contractor to sponsor it like they did the last ROV the school had.
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