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super cheap good converter...with 85%effenciency..0-30v variable power supply....
DIY Bench Power Supply for Hobbyistsby Patel Darshil
Converting Computer Power Supply to a Lab Bench Using ATX Breakout Board (8$)by DIY Electronic
Power supplies tutorialby Orbitalgun
Variable lab power supply (1 - 24 V, 0 - 1 A)by abizar
THE EXTREMELY SIMPLE DIGITAL DC-DC POWER SUPPLY!by EngineeringShock
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