Simple Adjustable Voltage Power Supply
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I'm always digging through my junk box for the right power supply so I picked up a mini buck converter unit to build a variable voltage power supply. I connected this device to a 31.5 VDC laptop power supply and now I can tweak the output voltage to whatever I need. Specs: Input Voltage: DC 3~42V Output Voltage: .75V~39V (continuously adjustable, the input voltage must be .75V higher than the output voltage) Output Current: 2A(normal and stable), 4A Max. Under $10, DROK Brand Voltage Switching Regulator at Amazon: http://bitly.com/1NoRCQx (Make sure to choose the option that has the LED display & heatsink!)
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