One infrared burglar alarm circuit

Infrared alarm system is the use of infrared LED emits invisible light, when the light is blocked by the body, namely the police. It consists of an infrared light emitting circuit and reception circuit
One infrared burglar alarm circuit - schematic

(by the infrared light-emitting diode VL, sensitive three-pole tube VTi composition), the switch circuit (composed by the transistor VT2-VTs) and actuators - relay KA composition.

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