Bus stop indicator (CD4516、CD4514、555、KD9300) circuit

Published:2011/4/26 3:20:00 Author:TaoXi | Keyword: Bus stop, indicator | From:SeekIC

The bus stop indicator (CD4516、CD4514、555、KD9300) circuit is as shown. This circuit is composed of the 555 monostable delay circuit, counter IC2, decode monitor IC3 and the audio delay circuit.etc. The monostable delay circuit is composed of the 555 and Rt, Ct, the delay time is td1=1.1RtCt. Counter IC2 can be preset the 4-bit reversible counter CD4516. IC3 is the 4-bit latch 4-16 line decoder. The audio circuit is composed of the music integrated circuit IC4 (KD9300) and the speaker.etc. If you press the switch AN, IC1 outputs the delay pulse to counter IC2, IC2 pluses 1 (minuses 1) count, the output Q1～Q4 get into the IC3 to be decoded, then feedback to the IC3 by the IC5. Each time the car go into a station, the driver press the AN to help the passengers to get off easily.



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