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consisting of TWH8751 lock control anti-theft alarm circuit

2017-01-08 02:26  
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consisting of TWH8751 lock control anti-theft alarm circuit
Figure shows the lock control anti-theft alarm circuit. The circuit consists of RS flip-flop, gated oscillator, the alarm circuit and so on.RS flip-flop consists of the NAND gate F2, F3, strobe oscillator consists of integrated circuits TWH8751 and R, C. When the SKK is in the lock position, and the input 2 of NAND gate F1 is high, the state of DBK1-n is direct reflected by F1, if DBK1-n has an open circuit, the F1 output is low, RS flip-flop is set to 1 ,Choose the end (2) feet of the corresponding TWH8751 is low, trigger oscillator starts to oscillate, the oscillation signal makes the loudspeaker alarm.