[sdiy] Headphone distribution amp

[Edu Silva]

Hi all


Roel Das wrote:
> 
> ... I'll be using it with linear reference headphones, so it has to
> be state of the art. Which opamps are best for this, other issues?
>
> It's a fairly simple thing, a basic mixer, with 2 stereo inputs, and
> some headphone amplifier outputs with seperate volume controls...


Use the basic Paia layout, and use another opamp. One good choice (a 20W
power amp, in fact) is the LM1876 from National Semiconductor, a very
good sounding device. You'll need to limit the output power, of course.
The datasheet will show you how.

Or, better yet, try the Analog Devices BUF04. (visit the the website).
Burr-Brown makes a nice set of audio buffers that sounds nice, too.


> Another thing I'd like to do is get it powered from a DC wall adapter.
>
> ... Just doesn't seem high end audio enough for me... :-)


If you want hi-end, forget "wall-warts". Build a symetrical and
regulated power supply, with LM317/337.

Good luck, 
 
 Edu Silva . ES2 Audio
 Salvador  BA   Brazil
 bahi0387 at terra.com.br
http://audiolist.cjb.net



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