Security alarm for backyard utility rooms. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Security alarm for backyard utility rooms. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Security devices and object signaling

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The author installed his alarm system using the mains. To do this, I assembled a simple signaling device (see figure), consisting of a household electric bell HA, an SA1 toggle switch, MTX-90 thyratrons or the like, connected through resistors. This part of the circuit is in the house. Blocks marked "block 1", "block 2", etc. are installed at the facilities. Each block includes reed switches SB2, SB3, etc., a lighting lamp and a resistor (in the first block, EL1 and R2 are indicated).

Security alarm for yard utility rooms

The signaling device works as follows. Reed switches (or microtumblers) are mounted in the doors and windows of the building and on the cellar lid so that when the door (window) is closed, the reed switch contacts are open (the magnet is adjacent to the reed switch). When you try to unauthorizedly open the doors, the contacts are closed and through the light bulb (EL1 in the first block) the electric bell HA located in the house is turned on. At the same time, the thyratron (HL2 for the first block) lights up, indicating in which room the operation occurred.

Enabling and disabling the sound alarm is made by the toggle switch SA1.

Details. X1, X2 - household socket-plug; SA1 - toggle switch TP-1-2 for voltage 220 V and current 5 A; HL1-HL3 - any thyratrons or neon lamps (MTX-90 were actually used); R1-R3 - resistors MLT0,25 or similar 0,8 ... 1 MΩ; SB1, SB4 household electrical switches; SB2, SB3 pushbutton switches or reed switches; EL1, EL2 - household electric lamps in the premises; X3-X7 - RP-10 type connectors or similar.

Author: B.S. Shadykhanov

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