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The scheme was found on one of the bourgeois sites and was slightly redone. The device allows cotton to turn on and off the power circuit. I intend to use it to turn on the light. The device is quite sensitive thanks to a twofold amplifier on low-power transistors. It reacts to cotton at a distance of 5 meters from the microphone. All parts have been replaced by domestic.
The microphone amplifier uses domestic transistors of the kt 315 series with any letter or index. In the final cascade, a powerful transistor switch is used on the kt 818 series bipolar transistor, all other details are as in the original circuit. You can exclude the relay from the circuit and connect the load to its place, but this is only in cases where you need to manage loads with power up to 12 volts, if you need to manage loads with power from the network, you can’t do without a relay. At the time of a clap, the microphone receives a wave, and how the signal is fed to a power amplifier, which alternately amplifies the signal received from the microphone. The amplified signal arrives at the key base, its value is sufficient for the transistor to operate, and at this moment the transistor transition opens and conducts the current that supplies the connected load or relay.
When assembling, observe all the ratings of the parts, even a slight slope can lead to abnormal operation of the circuit breaker. The device responds not only to pops, but also to low-frequency noises (powerful basses, etc.).
The range of supply voltages is from 4 to 16 volts, only use stabilized constant voltage sources and in no case do not use switching power supplies, the device will not work with them!
For the trial version, the device was mounted, then it will be transferred to the board, the main thing is that everything works without failures.
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