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Solar Panel How To

Stella Said:

How do i connect a solar panel to usb cable?

We Answered:

USB specification is 5 volts ± 0.25 volts, at up to 1 amp.

Pin 1 is +5v, pin 4 is ground.

You need a 5 volt regulator, such as a LM7805, to regulate the voltage, which means you need the solar panel to supply 7 volts at 1 amp. The regulator will need a heat sink.

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