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Last Updated On:  Wednesday June 02, 2021

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Ultra Low Power Latching Relay Circuit (4/29/2007)


Design a circuit, which can latch and unlatch +5v latching relay from a small 3 volt lithium cell battery.


The circuit below takes advantage of some inexpensive small super capacitors.  The circuit pumps 6 volt pulses into the separate 5 volt latching and unlatching relay coils.  A short 25ms pulse is all that is needed to flip the relay states.  A third super capacitor is used to supply a higher peak current than a small lithium cell might otherwise be able to supply. 



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