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555 game machine control hand shank circuit

2015-01-31 05:46  
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555 game machine control hand shank circuit
The figure 11-17 is a circuit diagram of two hand shanks, their functions are the same, but the computer plug connection is different. CD4021 is CMOS type 8 bit parallel input/serial output shift register(non-synchronous parallel set), when it is synchronous parallel seting, the seting number is controlled by shift and fusillade buttons which are connected by DP1(15 foot), DP4(4 foot), DP5(5 foot), DP6(6 foot), DP7(7 foot). The repeating pulse is produced by astable multivibrator which is composed of 555 and R, C, the oscillation frequency of the graphical parameters f=1.44/(R1+2R2)C, it is about 50Hz.