ES-06     Bi-stable (toggling) Touch Switch
 

(DC 9V)   (Relay contact : 2A)
 

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This kit toggles a miniature relay when you touch the sensor plate with your finger.

The circuit works in the touch ON / touch OFF  (or bi-stable) mode. 

The transistors Q3 & Q4 form a transistor-transistor T-flip-flop which toggles its state when the plate is touched
   
The kit is ideal for use a teaching aid to explain how transistor-transistor T-flip-flop works.