Carport wireless alarm circuit a


Posted on Mar 28, 2007

Circuit for the principle: The alarm circuit consists of two parts, the transmitter and receiver. Figure a shows the transmitter circuit, GT is a smoke break reed switch, usual


Carport wireless alarm circuit a
Click here to download the full size of the above Circuit.

ly shed door when the magnet close to the GT, GT inside contacts open. lC1 is 555 circuits, and R3, R2, C3 constitute self-excited multivibrator, the oscillation frequency of 1 kHz. lC2 is built-in antenna type transmitting circuit T630, contains an internal pulse modulation, amplification shaping, firing several parts circuit, operating frequency is 150 kHz.




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