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Outdoor antenna alarm circuit

2014-11-15 11:12  
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Outdoor antenna alarm circuit
The outdoor antenna alarm circuit is as shown. The power supply of the microwave antenna is indoor, and the frequency converter is outdoor. They are connected with a 75 coaxial cable, this 75 coaxial cable is uses as the power cord and the signal line. In normal work, the current of 180mA~220mA gets through the electric cable, so we can form the alarm device by detecting this current and adding the simple alarm circuit. The current detection part is composed of the R1, R2, R3 and the photoelectric coupler IC1, the alarm device is composed of the NE555 and the peripheral components, the 7812 supplies the stable DC voltage for the 555.