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digital coded lock circuit with CD4520

2017-01-06 08:50  
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digital coded lock circuit with CD4520
Figure shows the general-purpose digital coded lock circuit formed by the CMOS digital integrated circuit, which is characterized by a wide supply voltage range, low power consumption, anti-jamming performance, fewer external components.There are 256 password combinations, and it is of pseudo-code switch, and has a good security feature, the circuit is shown as figure.The coded lock circuit consists of a dual-binary synchronous add counter CD4520,and there are twobinary counters of same structure in the circuit.