The high voltage code protection alarm circuit

Published:2011/6/22 1:57:00 Author:Borg | Keyword: high voltage, protection | From:SeekIC

In the circuit is the high voltage code protection alarm circuit. The alarm uses resistance code to recognize the true or false, so it can be used to the door, window, handbag, lock case and so on. The core of the circuit is the multi-resonance oscillating stereo circuit, the chip CD4069 and transformer B are used as the drive stage. In the circuit, when a and b is broken down or short, the resistance of the resistor Rx may rise or fall, which leads to the high output LEV of F4 OR gate circuit(e point), so the pipe BG1 is conducting, and the stereo circuit is passable, which generates the dual sound alarm signals.



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