Thursday, February 18, 2010

Ultra Simple Stereo Computer Speaker Driver

In this project we design miniature stereo computer speaker driver using TDA2822 power amplifier IC. Main goal of this project is to design small stereo power amplifier which may be able to fix inside the small speaker boxes. Supplied PCB of this project has dimensions of 4.5cm × 4.5cm, which include both power amplifier and PSU.

Some of important technical specifications of this project are listed in below,

  • Recommended Supplied Voltage : 5V – 9V AC
  • Output Power : (with 8Ω load and 7.5V AC Power Source) : 2 × 1W
  • Voltage Gain (with feedback) at 1kHz input signal : 38.5dB
  • Total Harmonic Distortion : (with 8Ω load and P0 = 150mW) 0.2%
  • Channel Separation : 50dB

When wiring the project it is recommended to place screen-wires to the input terminals of amplifier and keep them separate (away) from AC power lines and transformer unit(s).

It is not necessary to install heatsinks to TDA2822M IC (with given input and output parameters).

Complete schematic, PCB design and documentation of this project are available to download at elect.wikispaces.com.