Hi-Fi Headphone Amplifier

Posted on Oct 19, 2012

This design for a headphone amplifier arose after the purchase of commercial equipment with separate pre and power amplifiers without a headphone output. Its advantages are ... * low output impedance to drive several pairs of phones * the active gain stage is, almost, perfectly logarithmic and ... o is independent of the absolute value of the pot o has excellent channel tracking o the O/P noise reduces with gain reduction.

Hi-Fi Headphone Amplifier
Click here to download the full size of the above Circuit.

The intention is to permanently insert the headphone amp between pre and power amps, although it can be used as a stand-alone item. The input relay is operated by auxiliary contacts on the headphone sockets through a transistor driver (with a small delay)

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