Sound operated two-way switch

This circuit operates a relay each time a sound of sufficient intensity is made, thus one clap of the hands will switch it one way, a second clap will revert the circuit to the original condition. Q2 and Q3 form a Schmitt trigger. The JK flip-flop isoised as a bistable whose output changes state every time a pulse is applied to the clock input (pin 12)
Sound operated two-way switch - schematic

Q4 allows the output to drive a relay.

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