Transistor based Toggle Switch

Toggle/T flip-flop is a kind of logic circuit that change it's output state when detecting transition in it's input. An application example of this component is soft power button, that is a push button that acts in sequence of push-on-push-off, just as what we usually seen in stomp box guitar effects and some electronic goods. The circuit below use transistor as main component to replace the necessity of common T/FF logic ICs.

 

Bowden's Circuit

The circuit that is used in stompboxes are a bit different, but they act in the same way. The example bellow can be found in boss DS1 and MT2 effects. Both implement the same circuit.

 

Toggle switch from MT2 schematic

Toggle switch from DS1 schematic

Reference:

MT2 Schematic

DS1 Schematic

Tonehome 

Bowdens