Tone Stack for Guitar Amplifier Reference Design


Design files


This split-supply, high-performance guitar tone circuit provides control of the bass, mid, and treble frequencies of an electric guitar signal, while also providing gain with minimal distortion and noise. Buffered inputs and outputs preserve the behavior of the system independent of the source and load impedances, and a radio frequency (RF) filter on the circuit front end attenuates noise from outside the audio band.

  • THD+N at 1 kHz: -105 dB
  • Treble adjustment range: 10 dB
  • Mid adjustment range: 9 dB
  • Bass adjustment range: 19 dB
  • Supply voltage: ±15 V
  • Utilizies OPA1642 high-performance, JFET-input audio operational amplifier
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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.


Detailed schematic diagram for design layout and components


Detailed schematic diagram for design layout and components


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


Includes TI products in the design and potential alternatives.

Audio op amps

OPA1642Dual SoundPlus™ high-performance, JFET-input audio op amp

Data sheet: PDF | HTML

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Technical documentation

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* User guide Tone Stack for Guitar Amplifier Reference Design Apr. 07, 2015

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