More ideas from Ben
How to Convert a Computer ATX Power Supply to a Lab Power Supply

How to Add Variable Voltage to Your ATX Based Bench Power Supply. If you've built a bench power supply using an old ATX computer power supply, you may feel limited by the choice of voltages + + and +/- DC.

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Old phone charger into USB

Chances are, you have some old mobile phone chargers lying around the house with non-USB pins. Instead of junking it, Martin Melchior shows us how to attach USB ports and give those chargers a new life.