555 electronic festival candle circuit

Published:2011/5/22 4:07:00 Author:TaoXi | Keyword: electronic, festival candle | From:SeekIC

As the figure 17-46 shows, the electronic festival candle circuit is composed of the step-down voltage stabilizer, the candle light display circuit and the music blessing circuit.etc. The candle light display circuit is composed of the clock generator, the annular counter and the 21 LEDs which are used as the flame. The astable multivibrator is composed of the dual time base circuit IC1a(1/2 556) and the R1，R2，C1, the oscillation frequency f=1.44/(R1+2R2)C1. The parameters of the figure has the oscillation frequency of 20Hz. It's pin-5 is used as the shift clock CP in the IC2 annular counter. The IC2(CD4017) is one piece of decimal count / pulse distributor, it's R port and pin-13 connect to the ground to form the annular count circuit.



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