555 electronic christmas tree circuit

Published:2011/5/22 3:33:00 Author:TaoXi | Keyword: electronic, christmas tree | From:SeekIC

As the figure 17-48 shows, this circuit is composed of the clock pulse generator, the pulse distributor circuit and the driving display circuit. The astable multivibrator is composed of the 555 and RP1，R1，R2，C1, the oscillation frequency f=1.44/(RP1+R1+2R2)C1. The oscillation period T=1/f. It's output is uses as the counting clock of IC2, IC2 uses the decimal counter/pulse distributor CC4017, under the action of the clock, Q0 ~ Q9 appeare the high-level pulses one by one, the pulse width is the clock period, and the pulses conduct the corresponding VT1 - VT6 in one time.



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