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HOW TO: Wire a DPDT rocker switch for reversing polarity
I built this using a toggle switch, so I could run a scavenged DC motor forwards and back, as a proof of concept. Me and my son are going to be building a toy car out of scavenged parts around the house. Oh, also, the power supply I used is a repurposed USB cable plugged into a 5v 1A device charger.