One infrared burglar alarm circuit

Posted on Mar 28, 2007

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
Click here to download the full size of the above Circuit.

(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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