In article , Don Pearce
wrote:

If it were me I'd probably buy one of the cheap kits I used for
http://www.audiomisc.co.uk/HFN/HeadDAC2/HeadDAC2.html

I don't know if the board is laid out for gain, but your headphone amp
shows a unity-gain circuit only. I can't imagine they failed to make
provision for gain, though.

I altered the circuit. As supplied the components and diagram give some
gain. In effect its a cheap way of getting a set of components and board
for a stereo gain block.

Jim

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