Alarm device. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Security devices and object signaling
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This device allows you to protect various objects. When it is activated, sound and light signals are given. It is also possible to send a signal to a centralized monitoring station.
The sound signal is limited in time to 1 - 2 minutes. Its duration determines the capacity of C3. Together with the device, it is possible to use any sensors that work on opening. With a significant length of the security loop, C3 is installed in the device with a capacity of 1000 to 10000 pF. After turning on the device after 30 - 40 seconds. switches to the armed mode, while a dim glow of the signaling device is noticeable.
In case of a short-term violation of the integrity of the loop, the system switches to the alarm mode. The frequency of flashes is set by R7, the tone of the sound signal is R8. The power supply (9 - 12V) is connected to terminals 2(+) and 3(-). Security loop - to terminals 1 and 2. Light signaling device (AL307BM) - to terminals 5 <+) and 3 (-). Sound emitter (R10 Ohm) - to terminals 2 and 6. Output to the monitoring console - to terminals 4 (+) and 3 (-).
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