Protects electricity. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Security devices and object signaling
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"... If someone here and there sometimes ...", they once sang in a police series. Today, the lack of spirituality has caused a real boom in theft. How to protect material values from those who have not received spiritual values in their lives?
Car enthusiast R. Stasiv solved the problem of protecting his car very simply and without expensive imported systems. In his car, in the most prominent place of the instrument panel, a multi-pin chip-connector is reinforced. The driver has the other half of the chip and, as you understand, the car will not run without it. From the back of the shield to the "mother" chip, there are wires from the vital systems of the car. The "father" chip, located by the driver, is a plug containing the necessary jumpers to "order" the operation of the car's electrical equipment. In a hidden place, you can arrange another parallel "mother" chip in case the main one is broken by intruders.
Not only the personal property of citizens suffers from thieves. Recently, the theft of equipment containing precious metals from rural telephone exchanges (ATS) has become more frequent.
District ATS engineer R. Koturbash developed a simple relay signaling based on parts from the station spare parts and accessories kit (see figure).
The circuit operates from 60 V backup power. A magnet is glued into the door of the station, which, when the door is closed, closes the reed switch. Alarm automation consists of two relays: K1 with a resistance of 4000 ohms and K2 with a resistance of 1000 ohms.
The security is activated by supplying power to the circuit and closing the front door. The call is silent. If you open the door, a bell will ring, hidden in an inaccessible place, and free relay contacts will "tell you where you need to go" about visiting the PBX. An employee servicing the exchange knows how to quickly de-energize the circuit with a securely hidden switch S1. The fitter's handset he has informs the police about the false call.
Of course, the circuit can be converted to 12 V or 220 V. We wanted to show that security equipment can be very cheap and simple.
Author: Y. Borodaty, Ivano-Frankivsk region.
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