On Wed, 05 Jul 2017 10:11:34 +0100, Jim Lesurf
wrote:

In article , Don Pearce
wrote:
On Tue, 4 Jul 2017 19:23:34 +0100, "Brian Gaff"
wrote:

a single transistor stage with, say an emitter follower would suffice
though these days the over designers would probably use an Ic. Brian

Under-designers, you mean. With an IC you don't have to do any design -
just set two resistors to give you the gain you want.

And that is exactly how I would do this - it's by far the best way.

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.

d

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus