The acoustic switch is as simple as that

A LED panel for indoor lighting was assembled a couple of weeks ago and it was decided to assemble an acoustic switch for it and today I want to consider perhaps the simplest scheme of an acoustic switch.
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The scheme was found on one of the bourgeois sites and slightly redone. The device allows the clap to turn on and off the power supply. I intend to use it to turn on the light. The device is quite sensitive due to the double amplifier on low-power transistors. The cotton responds at a distance of 5 meters from the microphone. All parts were replaced with domestic ones.
 Acoustic switch is simpler than simple
The CT 315 series domestic transistors with any letter or index are used in the microphone amplifier.In the final cascade, a powerful transistor switch on a kt 818 series bipolar transistor was used, all other details as in the original circuit. It is possible to exclude a relay from the circuit and connect the load to its place, but this is only in those cases when it is necessary to control loads with power up to 12 volts, if you need to control loads with power from the network, then you cannot do without a relay. At the moment of clap, the microphone receives the wave, and as a signal, it is fed to a power amplifier, which in turn amplifies the signal received from the microphone. The amplified signal arrives at the base of the key, its magnitude is sufficient to trigger the transistor, and at this moment the junction of the transistor opens and conducts a current that feeds the connected load or relay.

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