Wednesday, July 6, 2011

Stereo Headphone Amplifier "Studio Series"

Stereo Headphone Amplifier circuit diagram

Here the diagram of stereo headphone amplifier. The circuit called Studio Series Stereo Headphone Amplifier, of course this a top rated and high performance headphone amplifier circuit.

Stereo Headphone Amplifier Main Features:

  • High output power (up to 200mW; into 8Ω and 32Ω)
  • High performance – very low noise & distortion
  • Drives high and low-impedance headphones
  • Dual headphone sockets – can drive two pairs!
  • Works with a preamp or any line-level audio source

Measured Performance:

Frequency response = flat from 10Hz to 20kHz (see graphs)
Rated output power = 200mW into 8Ω and 32Ω, 85mW into 600Ω
Max. output power (current or voltage limited) = 575mW into 8Ω, 700mW into 32Ω, 130mW into 600Ω
Harmonic distortion = typically .0005% (600Ω load),.001% (32Ω load) and .005% (8Ω load)
Signal-to-noise ratio (A-weighted) = -130dB (600Ω), -120dB (32Ω) and -111dB (8Ω) with respect to 100mW output power.
Channel crosstalk = better than -68dB from 20Hz-20kHz at 100mΩ output power (see graphs)
Input impedance = ~47kΩ || 47pF
Output impedance = ~5Ω

Complete electronic project, go to this page

About Audio Amplifier
An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.

The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio amplifiers require these low-level inputs to adhere to line levels.

While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. More explanation about power audio amplifier can be found at

This is a video tutorial about how to a very simple audio amplifier based on the LM386 amplifier chip. It can be built for less than $20 (or might be less than $8 in some countries) and used to amplify any low level audio signal including a guitar, bass or mp3 player.

Watch the video:

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