Showing posts with label battery. Show all posts
Showing posts with label battery. Show all posts
Tuesday, March 17, 2015
5v Powered Charge Pump Battery Charger
The circuit below will trickle charge a four cell pack of AA or AAA NiMH batteries. The circuit 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 circuit uses a single 74HC14 hex Schmitt trigger inverter in conjunction with a voltage doubler charge pump circuit.
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