Carport wireless anti-theft device circuit (1)
Source: InternetPublisher:张小哥 Keywords: Wireless anti-theft transmitter Updated: 2020/02/04
Circuit working principle: The alarm circuit consists of two parts: a transmitter and a receiver.
Figure a shows the transmitter circuit. The GT is a suction-break reed switch. When the carport
door is closed, the magnet is close to the GT and the contacts in the GT are disconnected. lC1 is a 555 time base circuit,
which together with R3, R2, and C3 forms a self-excited multivibrator with an oscillation frequency of 1 kHz. lC2 is
a built-in antenna transmitter circuit T630, which contains pulse modulation, shaping amplification, transmission
and other circuits . The working frequency is 150 kHz.
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