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.
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