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Build Your 1669 Digital Volume Control Circuit
Description
This electronic loudness controller possesses no potentiometer subject to failure and introduces a minimal amount of interference within the circuit. Volume adjustment is accomplished through the activation of UP and DOWN buttons. This uncomplicated circuit represents an excellent addition to any domestic audio undertaking.
Schematic:
Parts:
- C1 0.1uf Ceramic Disc Capacitor
- U1 DS1669 Digital Pot IC (See Notes)
- S1, S2 Momentary Push Button Switch
- MISC Board, Wire, Socket For U1
Notes:
- U1 is obtainable from Dallas Semiconductor.
- S1 activates volume increase, and S2 initiates volume decrease.
- The input signal must maintain a voltage level of not less than -0.2 volts.
- Employing a bipolar power supply (+/-5V is suitable) frequently resolves clipping issues. Verification of the datasheet is necessary to determine the correct pins for voltage application.
DS1669 Digital Pot IC
The DS1669 is a versatile integrated circuit designed for use as a digital potentiometer. It allows for precise volume control via digital commands. This IC offers adjustable resistance values that can be controlled by a microcontroller. Its compact size and relatively low cost make it a popular choice for applications requiring digitally controlled variable resistance. It typically includes features such as serial communication interfaces for easy integration into larger systems. The DS1669 is widely used in audio equipment, robotics, and other control systems where precise resistance adjustments are needed.