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Digital Volume Control Circuit Diagram – Build Your Own!
Description
This design can be utilized for substituting traditional manual volume controls within a stereo amplifier system. Within this circuit, a momentary push button switch, designated SW1, governs the forward (volume amplification) functionality of both audio channels, while another similar switch, SW2, regulates the reverse (volume reduction) operation of both channels. A commonly accessible integrated circuit, the DS1669 from Dallas Semiconductor, is incorporated here to manage the switching actions. This IC is a versatile microcontroller, often employed in applications demanding precise control and digital signal processing capabilities. It offers a digital interface for controlling the audio volume levels and can be programmed to implement complex control algorithms. Its low power consumption and small footprint make it ideal for integration into compact audio devices.
Circuit Diagram:
Parts:
- J1 = RCA Audio Input Socket
- J2 = RCA Audio Input Socket
- C1 = 0.1uF-16V Ceramic Disc Capacitor
- C2 = 0.1uF-16V Ceramic Disc Capacitor
- C3 = 0.1uF-16V Ceramic Disc Capacitor
- IC1 = DS1669 (is available from Dallas SCo.
- SW1 = Momentary Push Button Switch
- SW2 = Momentary Push Button Switch
Notes:
- Replaces conventional mechanical potentiometers.
- An electronic interface has been provided for both digital and manual control methods.
- A broad differential input voltage range exists, spanning from 4.5 to 8 volts.
- The wiper position is maintained without power supply.
- A cost-effective alternative to physical controls is offered.
- Applications include volume, tone, contrast, brightness, and dimmer control implementations.
- The circuit design is exceedingly simple and compact, needing very few external components.
- The power supply flexibility ranges from 4.5V to 8V.
- The input signal should not fall below -0.2 volts.