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Circuit Solutions Notebook
Last Updated On:  Monday April 21, 2008

Latest Technical Challenge           Previous Circuits Solutions           Circuit Solutions in Progress

Ultra Low Power Latching Relay Circuit

Challenge:

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

 Solution:

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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