Active Volume Control for Professional Audio


Design files


This TI Verified Design implements a split-supply, high-performance volume control which attenuates a professional line-level audio signal with minimal distortion and noise. An input buffer preserves the behavior of the system independent of the audio input source impedance. A radio frequency (RF) filter on the circuit front end removes noise from outside the audio band, while a bidirectional transient voltage suppressor (TVS) diode protects against overvoltage spikes.

  • Input and Output: Professional line-level audio signal (+4 dBu / 1.228 VRMS)
  • Includes RF filter and over voltage protection
  • THD+N at 1 kHz: < 0.0005% (-106 dB)
  • Gain deviation (30% to 100% potentiometer rotation): ±1.5 dB
  • Supply voltage: ±15 V
  • Utilizes OPA1604 High-Performance Audio  Operational Amplifier
??image.gallery.download_en_US?? View video with transcript Video

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDR328.PDF (85 K)

Detailed schematic diagram for design layout and components

TIDC032.ZIP (2424 K)

Detailed schematic diagram for design layout and components

TIDR329.PDF (145 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC223.ZIP (1977 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Audio op amps

OPA1604Quad, SoundPlus High-Performance, Bipolar-Input Audio Op Amp

Data sheet: PDF

Start development


Technical documentation

= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* User guide Active Volume Control for Professional Audio Design Guide Jan. 08, 2014

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​