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555 hotel security electronic lock device circuit

2017-01-07 04:23  
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555 hotel security electronic lock device circuit
The control circuit is composed of the IC1(555) and the R1~Rn,R0,C1, it produces many kinds of oscillation frequency signals in the range of 10Hz~500kHz, you install the receiving circuits which have different frequencies. When you close one of the self-locking switches K1~Kn, and the passenger presses the corresponding Kn, the door opens. The receiving action circuit in the guest room is composed of the special audio decoder circuit 567 and the transistor switch relay controller. Figure (b) shows the structure schematic of the original night lock. When the relay closes, the steel core of the night lock is sucked in the middle part to pull the lock handle and switch.