This mixer can be used for mixing of two audio signals. It has two stages: mixer-preamplifier and headphone amplifier. The mixer stage is realized by the Texas Instruments (NSC) high quality micropower dual opamp LMV797B, connected in inverting summing amplifier configuration. The left/right audio signals from both inputs are summed separately (left with left, right with right). With the stereo trimmer potentiometers both signals (left and right) from each input are tuned simultaneously. The opamp performs also some band pass filtering. The second stage is based on the Texas Instruments (NSC) high quality headphone amplifier LM4880. It requires only few external parts and sounds pretty well. I used it also to create the virtual ground node for the mixer opamp. The audio mixer is supplied from the PC USB voltage output. Of course some AC/DC adapter with 3-5V stabilized voltage output can be used.
The device can be used also as standard phone amplifier - if only one signal source is connected. Additionally it can be used for: 1) sound mixing effects when editing films (for example for "Youtube"); 2) DJ mixing at parties 3) sound recording activities 4) gaming effects...etc.
further information can be found here : http://www.instructables.com/id/Audio-mixer/
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