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555 electric rolling circle game machine circuit

2015-02-04 14:00  
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555 electric rolling circle game machine circuit
As shown in the figure 11-5, the electric rolling circle circuit is composed of clock generator, counting circuit and coding, display circuit. The astable multivibrator is composed of 555 and R1, R2, C1, the oscillation frequency f=1.44(R1+2R2)C1, it is about 1000Hz. As IC2's counting clock, its output is added to 14 foot. IC2(74LS93)is TTL type four-bit binary system counter, its 8-4-2-1 code output is added to IC3(74LS154), IC3 is 4-line to 16-line encoder, its 16 output lines take 1 from 16 according to IC2's binary number, and it is low level in order, the circinal 16 LEDs LED1~LED16 are lighted in order, they are chasing rolling ball-shaped.