Power Amplifier with Output Headphone Connection

Headphones are not connected to the amplifier audio outputs, loud sound damages the headphones. A two-channel circuit designed to connect headphones to the high outputs, in addition to the circuit with mute on-off controls added. It works with 12 volt dc. The amplifier outputs are connected to this circuit. being done Control ICs LM556 74HC74.

Two-channel Stereo Headphone Adapter

Have a stereo amplifier without a headphone socket but want to listen to your music with headphones? If so, this versatile Stereo Headphone Adapter will do the job. It connects between your amplifier and speakers, has a variety of operating modes, and includes two output sockets with separate volume controls.

Generally, headphone output is not included in a Class A Stereo Amplifier because excellent audio performance takes precedence. Both wiring paths and overall circuit layout are critical design factors and, however small, can cause large variations in the signal-to-noise ratio and harmonic distortion patterns of the amplifier.

The Stereo Headphone Adapter connects between your stereo amplifier and speakers and can use two pairs of headphones.

If you want to listen with headphones, a much better option is to build the simple Stereo Headphone Adapter presented here. It connects directly to the speaker terminals of the amplifier and switches speakers and stereo headphone sockets using two DPDT relays, so there is no chance of degrading the audio performance.

As mentioned in the introduction, you can connect up to two stereo headphones. These can be turned on or off with the touch of a button, and the volume of each can be individually controlled. Additionally, the speakers can be turned on or off, and there’s also a Mute button that turns everything off.

Source: http://www.siliconchip.com.au/cms/A_110349/article.html

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