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More Indicator Circuits     Current Monitors

Bidirectional DC Current Indicator
March 31, 2011

This hobby circuit is handy for battery powered systems.  The circuit is self-powered using a single 3v lithium coin cell.  The current draw is so low that the battery should last for years.
The circuit flashes a red LED when DC current is drawn from the battery and flashes a green LED whenever current flows into the battery.  Two “probe” input wires connect across a section of cable, which acts as a shunt resistor.  A voltage of only 5mv in either direction will trigger a LED indication.

Click on Drawing Below to view PDF version of Schematic

Bidirectional DC-Current Indicator Circuit designed by David Johnson

More   Indicator Circuits     Current Monitors

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