(on/off) push button using Flip Flop

Thread Starter


Joined Apr 18, 2008
Hi Guyz

i am looking for the simplest push button Circuit like the one used in water pumpers ..

Push once to "trun on" push again to "Turn off"


some one told me that i could Use Daul D FF



Joined Apr 15, 2008
Connect /Q back to D. Then use the switch to pulse the clock. Realistically, there needs to be more, but that is the topology.


Joined Sep 24, 2009
Moved to new thread in the Project Forum


I ran across this thread and thought I'd hijack it as it's so old but is very relevant to what i'm doing.
Using a simple Dual D FF as indicated, using a Schmitt trigger with the "momentary on" pushbutton w/debouncing; I want to drive 2 sections of a 4066 quad bilateral switch for the switching of line level signals. Tho /Q is tacked to D. Can /Q be tapped also to a switch actuator of the 4066? Or would it be better using Master/Slave configuration? The purpose is to switch from one active signal path to another (A/B switch). This will be multiplied into a digital signal switching matrix for my guitar rig. Is there a particular Dual D FF IC that would be recommended? Will the Schmitt give sufficient "edge" to toggle? I would prefer to have leading edge vs trailing for timing reasons.

It's been a long time away from design work, so forgive my ignorance or "thickness".

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