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Current Indicator Circuits Battery Charge
Current Indicator 7 This
circuit was inspired by a company needing a DC current indicator light which was small
enough to be molded into a medium size 28v rechargeable battery assembly. They
specified that they wanted the circuit to turn on the LED indicator light with 500ma
or more of battery charge current. When surface mounted components are used, the
complete assembly should be smaller than a postage stamp. A LM4040 5 volt
reference diode used both to provide a fixed 5v for the circuit and when divided down
to just 5mv, it also serves as a reference to a low power voltage comparator. |