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Radio Digit-Type Frequency Display (C040,556) Circuit Diagra

2016-12-02 21:42  
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Radio Digit-Type Frequency Display (C040,556) Circuit Diagram
The above picture is radio digit-type frequency circuit diagram. The circuit is double time based circuit 556(IC1), BCD-code three-digit counter IC2(MC4553), twelve binary-system serial counter/frequency-divider IC4(C040), BCD-code seven-phase latch/ decoder/driver, four luminous Nixie tube LED etc.