How I can connect a solar panel for the USB cable?
How do I connect a solar panel with a USB cable (for charging the phone)? Do I just cut the big end and solder the child in the back. Since I have solar panels. V is the voltage I need to use or osmething?
specification USB is 5 volts ± 0.25 volts, up to an amplifier. Pin 1 is +5 V, pin 4 is constant. You need a 5 volt regulator, as an LM7805 to regulate the voltage, which means you have solar panels to power 7 volts at 1 amp. The regulator needs a heat sink. .
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