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Last Updated on: Tuesday, June 01, 2021 03:06 PM

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More  Charge Pump Circuits

Charge Pump Battery Charger+5 Volts (2/7/2010)


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.

Click on Circuit Below to view PDF of Schematic

+5v Powered Charge Pump Battery Charger designed

 by Dave Johnson, P.E.



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