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555 audio signal array display circuit

2016-12-03 13:40  
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555 audio signal array display circuit
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.