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Latch Circuits
Designed by David A. Johnson, P.E.

Last Updated on: Friday, July 18, 2008 11:34 AM
Master Category List - Dave's Circuits
 
  • Low Voltage Latching Relay Driver
    Using some small super capacitors, this circuit can latch and unlatch a mechanical relay with 10 amp contacts, from a small 3 volt power source.  By using a latching relay, power can be controlled to a load with a tiny battery.   (added 7/06)
  • PUSHBUTTON ONESHOT AND LATCH
    This circuit uses a single IC to convert a noisy pushbutton switch signal into a clean pulse or a sustained push on-push off signal. It can operate from 3v to 18v.
  • Ultra Low Power Latching Relay Circuit
    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.
  • Universal Flasher using Latching Relay:  This circuit is powered by a 9v battery and controls any AC to DC load through a set of relay contacts, rated at 10 amps.  To conserve power, the circuit uses a latching relay.  A variable frequency oscillator controls the flashing speed from 0.2Hz to 2Hz.  A pair of pulse generators first latch the contacts closed then unlatches them open.  The power consumption is so low that a 9v battery will last for several months.


More Latch Circuits

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