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DiscoverCircuits.com  --   Hobby Corner
 Last Updated on:  06/01/2008 07:14:20 PM

Battery Charging Current Indicator
This electronic hobby circuit is handy when you want to know if current if flowing into a battery from a charger module.  The simple circuit uses a common LM393 dual voltage comparator IC.  The LED indicator light will turn on when there is at least 25ma of current flowing.  The circuit shown is designed for a 12v battery but it could be used for other voltages with some minor component changes.  With the components shown, the maximum charging current should be less than 1 amp.  
 

Click on Drawing to view PDF

Battery Charge Current Indicator Circuit designed by David Johnson, P.E. (June 30, 2006)

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