This is a Very Low Current Touch Switch Circuit Diagram. A touch switch is an electronic device that enables us to control a circuit by simply. Touching the on contacts with a finger brings pin 3 high, turning on the Darlington pair and supplying power to the load (transistor radio etc) Ql must be a high gain transistor, and Q2 is chosen for the current required by the load circuit.
Low Current Touch Switch Circuit Diagram
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