Portable signaling device. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Security devices and object signaling
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A portable signaling device, the diagram of which is shown in the figure, is assembled in a plastic case, for example, in a soap dish. A metal chain or hook, a plastic sensitivity knob (R1), a toggle switch SA1 of the power switch are brought out.
By a metal chain or hook, the device is hung on a metal doorknob or keyhole, the power is turned on, and the moment of generation breakdown is adjusted by the regulator R1.
When you touch the door handle or try to insert the key, the generation breaks down and the alarm turns on. The beep will continue until the power is turned off or the batteries run out.
Author: N.L. Arzamastsev
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