Thursday, August 21, 2014
5v Powered Charge Pump Battery Charger
The schema below will trickle charge a four cell pack of AA or AAA NiMH batteries. The schema draws current from the +5v available a USB connection and pumps about 70ma of current into the battery. This should be enough current to fully charge a pack of 2500ma-hour cells in about 36 hours. The schema uses a single 74HC14 hex Schmitt trigger inverter in conjunction with a voltage doubler charge pump schema.
5v Powered Charge Pump Battery Charger Circuit Diagram
Source: DiscoverCircuits
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