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The 8-line interlock switch circuit

2017-01-08 11:16  
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The 8-line interlock switch circuit
The circuit working principle The power supply of the circuit is 12V, which is regulated by IC1(7805) and turned into the 5V power supply. IC2 and the external elements compose the 8-line interlock circuit, the relay J1~J8 compose the switch executing components. The pins of IC2 is marked in the figure. The 1-pin EN is the power terminal, low LEV is effective, so the 1-pin is connected with the earth directly. D1~D8 are the trigger terminals, CP is the clock terminal, Q1~Q8 are the output terminals. When AN1~AN8 are pressed in sequence, the corresponding triggers D1~D8 and CP terminal are in high LEV.