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Charge Pump with Arduino
Right: charged, left: normal 5V drive
A charge pump is a circuit that boosts DC voltage. I tried to make a charge pump using Arduino to enhance power supply for a blue LED. A blue LED typically has higher forward voltage. Some ones go to 4V, so 5V-supply processors are slightly powerless to drive it. Thus a charge pump helps to enhance blue LED brightness.
As you can see in the photo above, charged one is brighter. The supply voltage was increased to 8V in this case.
