A simple switch...

[rhahm]

Hi,<p>I need to make a simple electronic switch that operates like this:<p>When I press a momentary minibutton switch(no)a circuit closes and turns on a small lamp. When I press the same momentary switch again the circuit opens and the lamp goes off.<p>(Press momentary on switch once and lamp goes on; press again and lamp goes
off.)<p>Needs to work with 12v ac and dc low current source.<p>Any help appreciated,<p>RH

[unknown_entity]

They actually make latching push buttons to do just that. Push it once the switch closes push again and it opens.

[rhahm]

I know, but I need to do it this way as in addition to the mechanical switch there is an electronic device that also pulses the circuit to ground. When I send that pulse I want it to act like a switch.<p>RH

[cahartmanjr]

Use a "D" type flip-flop. Your button connects to the clock input, ~Q connects to D, and Q drives your relay (with appropriate driving transistor).

[russlk]

You should put an R-C filter between the switch and the clock input so contact bounce doesn't look like multiple switch closures.