Digital Volume Control

Posted on Jul 21, 2012

Circuit of a digital volume control using six discrete ICs, including a 5V regulator, is presented. IC1 (555) is configured to function as astable flip-flop. Its frequency or period may be adjusted by proper choice of resistors R44, R45 and capacitor C6 combination. Here it is for 0.3 second period. IC2 is a presetable up/down counter. In this circuit up-mode is used for increasing and down-mode is used for decreasing the volume. IC3 and IC4 are 16-channel analogue multiplexers which function as analogue switches. Here IC3 is used as level indicator while IC4 is used as a potentiometer.

Digital Volume Control
Click here to download the full size of the above Circuit.

Soon after the power is switched on, switch S1 is to be pressed to reset the whole system. When switch S2 is pressed, IC2 counts up the number of pulses and the result is available in the form of BCD output. IC6 is used as an interface between TTL and CMO

Leave Comment

characters left:

New Circuits



Popular Circuits

0-15V 1A Variable power supply
Rear Fog Light Controller With Delay
Automobile Lights-On Reminder
My Arduino In Circuit Programmer
24v 7ah lead acid battery charger
Oscillator circuits
Micro Power Transmitting Station
Download NL5 Non-Linear Electronic Circuit Simulator
Stimulated simple motor speed control circuit
NJU7365 use brushless DC motor drive circuit diagram