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More  Latch Circuits   Switches

On/Off Latch Circuit


Often you want to turn on and off power to a device with a single pushbutton switch.  The circuit below performs this logic function with just a few parts and can operate from DC supplies between +3v to about 15v.  It uses two inverters within a 74C14 or a CD4069 hex inverter package.  Each press of the button toggles between the two on/off logic states.  The logic output is connected to a PMV65XP p-channel FET from Philips. This component should be able to handle 2 Amps of current.  The inputs of any unused devices within the IC package should be connected to either V+ or ground.

Click on Drawing Below to view PDF version of Schematic

latch on/off circuit schematic

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