VEHICLE GUARD ALARM SYSTEM Russian patent published in 1994 - IPC

FIELD: electronics. SUBSTANCE: device includes vehicle vibration pickup 1; amplifier 2; threshold unit 3; alarm signal former 4; audio signal source 5; power supply source 6; main switch 7; delay element 8; operation mode resistor 9; univibrator 10; additional switch (such as hermetically sealed reed relay) 11; and magnet 12. By unauthorized action upon the vehicle (attempted break-in or disassembly) pickup 1 generates a signal which triggers the action of audio signal source 5. To temporary disable the system, the driver passes magnet 12 near switch 12 mounted in a place known by the driver, which results in blocking alarm signal former 4 for a time sufficient for the driver to turn off switch 7. EFFECT: enlarged operating capabilities. 1 dwg