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Last Updated on:  06/19/2009 03:02:23 PM

Battery Charging Current Indicator Circuit
designed by David A. Johnson, P.E.
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 Schematic below to view PDF version of this Circuit

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