A headphone amplifier is a kind of audio amplifier designed particularly to drive headphones. These devices allow for higher possible volumes and greater audio clarity than the smaller, cheaper amplifiers that are used in most audio players. Headphone amplifier with sub-mixing capabilities allow the listener to adjust, mix and monitor audio signals coming from multiple sources in the same time. The following page contains detail information on how to design a headphone amplifier circuit diagram which has low output impedance, excellent channel tracking and O/P noise reduces with gain reduction.

Reference: http://sound.westhost.com

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