This is an attractive alternative to bulkier ON/OFF switches for DC circuits. The circuit has a fairly simple explanation. U1 is a counter. Figure 1 A Flip ON Flop OFF circuit for DC voltages. The ...

It’s the flip-flop, and while its ... to what they called a “trigger relay.” While their original papers show that they recognized the utility of a circuit with two stable states, and ...

it stores the value in the flip-flop. The next time a clap is sensed, the circuit is reset. Output is as simple as a LED and a buzzer, but once you have that, connecting a relay is a piece of cake.