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Features:
Charging via mini-USB connector which is very common.
Charging status display by LED
Simple circuit by using opamp, resistor, and not by any complex dedicated IC or micro-controller.
Charges completely drained (0V) battery packs.
Max charging current 500mA(limited by USB supply), depending on battery.
[Source] http://circuitsdiy.com
Wirespondence, Serial Bluetooth with a Micro, Analog Front End, AM/FM Receiver Restoration
Selected questions from past Q&A columns.
Need to brush up on your electronics principles? These multi-part series may be just what you need!