This is digital volume control circuit that Can be applied to the normal volume of a power amplifier. When press switch S1 adds up the volume and press switch S2 to reduce the volume down. How it works IC1 is a 555 CMOS Timer Single IC will be connected in astable flip-flop model as pulse frequency generator up / down to input pin of the counter IC2-74LS193, through push-bottom switch S1 (Up) and S2(Down). Changing wide of pulse signal from IC1 may replace R1 with potentiometer. To begin with, when we press the switch S1 (increase sound) binary output will be add up and when press switch S2 (Reduce sound) the binary output will low down. The maximum counter to
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