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Last Updated on: 12/31/2008 02:47:42 AM

Miniature Pushbutton On/Off Switch Nov 9, 2008
designed by David A. Johnson, P.E.

In many battery powered devices, you would like to turn the circuit on and off by pressing a small pushbutton switch. One press turns the device on and second press turns it back off. The flip/flop circuit below uses a minimum number of parts to perform this function. It operates from DC supply voltage which can range from 2v to 6v. It draws very little current and takes up little space. Yet, it can control up to one amp of current. The circuit uses a single flip/flop device made by Texas Instruments. A filter circuit at the clock input debounces the switch contracts. A NPN transistor inverts the output signal and feeds that signal to the data input. This forms a classic toggled flip/flop so the circuit switches from one state to the other with each activation of the pushbutton switch.

Click on Schematic below to view PDF version of this Circuit