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Tuesday, June 01, 2021 03:06 PM
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Miniature
Pushbutton On/Off Switch Nov 9, 2008
designed
by David A. Johnson, P.E. |
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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. |
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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. |
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Click on Circuit Below to view PDF of Schematic |
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eMail David A.
Johnson, P.E. about this circuit |
