Maybe you know the very popular Joule Thief circuit, that usually is used to drive LEDs, but this instructable will show you how to regulate the output voltage up to 30 volts. You can regulate example to 5 volts that is enough to charge a phone or any USB device. It charges slowly but works. Or you ...By: Imetomi
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from Instructables: exploring - technology - robots http://ift.tt/1C4lBan
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