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LED dynamic display sequence generator circuit

2016-12-20 02:44  
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LED dynamic display sequence generator circuit
The LED dynamic display sequence generator circuit is as shown in the figure 14-43, it is composed of the time-base oscillating circuit and the decimal count/pulse distributor, and it has a few of external components. The multivibrator is composed of the 555 and R1, R2, RP1, C1, the oscillation frequency f=1.44/(R1+2R2+RP1)C1. The figure parameters' oscillation frequency is in the range of 2~14Hz, you can adjust RP1 to meet the dynamic changes of LED. The IC2 uses the decimal count/pulse distributor CD4017, it's CP port (pin-14) is triggered by the pulse sequence jump on edge to count, and it outputs the Q0~Q9 high-level pulses in proper sequence (pulse width T=1/f), also it drives the corresponding LEDs to turn on in proper sequence.