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Circuit diagram of electronic code lock with self-locking fu

2017-01-07 07:18  
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Circuit diagram of electronic code lock with self-locking function
Circuit diagram of electronic code lock with self-locking function
Circuit diagram of electronic code lock with self-locking function
The circuit is shown as in the above picture. Silicon controlled rectifiers SCR5, SCR6, and SCR7 are the main control components of the code lock. If the three-digit number code keys are pressed down in the right sequence (AN2, AN5 and AN7 in this case) , the silicon controlled ractifiers SCR2, SCR3, and SCR4 are conducted in turn, thus to conduct SCR5, SCR6, and SCR7 in turn. VT1 is saturated and conducnted. Electromagnet starts move. Meanwhile, SCR4 is conducted when the AN7 is pressed down, and then VT2 is saturated and conducted, which makes those keys not work then.