This is a circuit of a touch switch used to turn on and turn off the electronic device that is connected to the 220V home electrical installations. This circuit is connected directly to a 220V home electrical installations. “LOAD” on the schematic diagram above, is an electronic device with 220V AC current consumption.
This circuit will repel insects from your home or yard effectively. circuit uses a specific frequency to disrupt the insect so the insect will go away from this circuit. This insect repellent circuit can be placed inside or outside the home (for speakers). If you want to put the whole circuit on the outside of the house, make sure the circuit is in a safe place, especially when it rains.
The following circuit diagrams are tone detector circuit diagrams which also known as sound activated switch circuit. Actually, these circuits use microntroller for switching because the circuits were designed for robot start up activation. But you can build switching module using relay. Tone Detector diagram 1 Tone Detector diagram 2
This is the circuit diagram of a voice operated relay. It similar with sound activation switch circuit which will turn on and turn off (connect and disconnect) the switch depending on the sound input. The output switch of this circuit is act by a relay. Component Parts list: R1, R7 1K R2, R4, R8 10K R3 2K2 R5 1M R6 200K R9 39K D1, D4 1N4004 D2, D3 1N4148 C2, [...]