555 audio signal array display circuit

Published:2011/6/15 7:19:00 Author:TaoXi | Keyword: 555, audio signal, array display | From:SeekIC

This circuit is composed of the audio signal amplification circuit, the pulse position modulation circuit, the counting circuit, the audio display driver stage array circuit.etc. As the figure 14-44 shows. The input audio signal adds to the input port pin-8 of IC3(TBA810) through the electrical level adjustment potentiometer RP1. The output amplified signal is divided into two channels, one channel adds to the pin-3 of audio display driver stage IC1(LB1405), another channel adds to the voltage control port pin-5 of the IC4(555) time-base circuit as the pulse position modulation mode sync signal. When there is no input signal, the resonance frequency of 555 is f0=1.44/(R11+2R12+RP2)C11. The resonance frequency of the parameters is 59～61Hz, by adjusting RP2, you can make the resonance in the center frequency f0=60Hz.



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