LM317 Adjustable Voltage Supply
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Very simple schematic using an LM317 adjustable voltage chip commonly referred to as a Buck Converter. The thing that make it adjustable is the 10K potentiometer. Just add a meter to the output and you can dial up any voltage you need that's less than 12 volts. Power LED lights, battery fans, AM/FM Radio or any other small project you might have in mind.
what is D2 good for ?!?