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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
