HiFi DAC, Amp, and Equalizer

Project Overview

• Many Hi-Fi headphones require a dedicated amplifier to power the speaker drivers properly. (Full response and range)

• Not every device has a proper high impedance output for headphones.

  • Some devices don’t even have analog audio jacks! 

• Even then, the frequency response is not perfect. So the response can be corrected manually through a 6 band stereo equalizer.

• All of these analog devices can be quite costly and bulky for high performance applications.

• This project applies these techniques:

  • Power

  • Sensing

  • Actuation

  • Analog processing

USB Audio → I2C Device → DAC → Stereo Amp → Active RLC filters

Schematic

Layout