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Circuits designed by David Johnson, P.E.
Last Updated on: Wednesday, October 18, 2017 05:04 AM

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More  Driver Circuits, Relay Circuits

Remote Relay Driver   April 2, 2014

I received a call from a Discover Circuits visitor who wanted a simple way to turn on an outside lighting system using a low voltage control line.  I suggested the simple circuit below.

The circuit is powered by a 9v battery and uses a very efficient latching relay.  Two low voltage wires lead from the a toggle switch to the remote relay.  A toggle switch selects either the on or off condition of the relay.  The relay contacts are rated at 10 amps, so the small relay can handle a sizeable amount of power.

The relay is a latching type with a single coil.  The switch either charges or discharges a 330uF capacitor through the relay coil, latching or unlatching the relay state.  With a quality capacitor, the leakage current through the capacitor will only be a few microamps. A 9v battery should therefore last for many years of service.

Latching Relay

Click on Drawing Below to view PDF version of Schematic

Remote Relay Driver-designed by David Johnson, P.E.

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