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  • Build your own Variable Lab Bench Power Supply

    Bought different parts from NewEgg and finally had time to test the system properly. First, the pots have a polarity, and I tested mine. Looks like they were reverse order. I connected a 94W peltier cooler with heat syncs and fans, and using a 230w power supply, I quickly found out I couldn't force the module to output beyond 2A for any voltage under 10. In fact, the 200Ohm Pot is pretty much useless unless you want to slow charge something. Next, mine has (had) double sided taped on heat syncs on the regulators. These are super inefficient at heat reduction. If these regulators hit a high temp (still testing) the device will fault until you reduce to a safe voltage (10v). The max I can seem to pull is 19v 3.3a before the device faults and the power supply flickers low output. I've trie...see more »Bought different parts from NewEgg and finally had time to test the system properly. First, the pots have a polarity, and I tested mine. Looks like they were reverse order. I connected a 94W peltier cooler with heat syncs and fans, and using a 230w power supply, I quickly found out I couldn't force the module to output beyond 2A for any voltage under 10. In fact, the 200Ohm Pot is pretty much useless unless you want to slow charge something. Next, mine has (had) double sided taped on heat syncs on the regulators. These are super inefficient at heat reduction. If these regulators hit a high temp (still testing) the device will fault until you reduce to a safe voltage (10v). The max I can seem to pull is 19v 3.3a before the device faults and the power supply flickers low output. I've tried 3 total power supplies, so this is definitely the modules problem. Currently looking into schematics of the 3780 to see if my model is short-cutting or cheating.

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