"Jim Lesurf" wrote in message
...
This is just to let people know that I've now put up a webpage describing
the design of the simple headphone DAC I've been experimenting with during
the last few weeks. The page is at

http://www.audiomisc.co.uk/HFN/Headp...C/HeadDAC.html

The aim was to produce something inexpensive and easy to build so that
anyone willing to use a soldering iron and drill some holes in a metal box
could make one if they wished. :-)

It doesn't use any fancy items made of unobtainium, etc. I deliberately
bought all the bits from CPC so they'd be easy to source. But if anyone
wanted, it might make a nice basis for experiments and no doubt could be
'improved' or tweaked in all kinds of ways. That said, the unit described
works nicely here and I'm enjoying listening using it.

Slainte,

Jim


Hi Jim
It's looking good.
That DAC has been around for a while, Richer sounds were selling it
so one particular mag gave rave reviews so as to perk up Julian.
It is also badged up under other brands (in the old days that was
known as faceplating):
http://ukhdmi.com/digital-to-analogu...erter_QQ101638
http://www.lindy.co.uk/spdif-digital...ter/70408.html

Anyone reading who wants to give Jims excellent project a go,
the DAC can be found in an online search under the term "au-d3",
Can be got from ebay for about a tenner.

Previously when I checked it out it was impossible to locate a spec
sheet for it or anyone who had actually opened one? But will have
another look later today. A guess is it is the same intergrated chip-
Filter/2xO/S, into conversion found on intergrated MoBo chipsets
or soundcards etc.

--
Please use the address on the audiomisc page if you wish to email me.
Electronics
http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

In article , Fed Up Lurker
wrote:

"Jim Lesurf" wrote in message
...
This is just to let people know that I've now put up a webpage
describing the design of the simple headphone DAC I've been
experimenting with during the last few weeks. The page is at

http://www.audiomisc.co.uk/HFN/Headp...C/HeadDAC.html

Hi Jim It's looking good. That DAC has been around for a while, Richer
sounds were selling it so one particular mag gave rave reviews so as to
perk up Julian. It is also badged up under other brands (in the old days
that was known as faceplating):
http://ukhdmi.com/digital-to-analogu...erter_QQ101638
http://www.lindy.co.uk/spdif-digital...ter/70408.html

Thanks. Useful to know that.

Anyone reading who wants to give Jims excellent project a go, the DAC
can be found in an online search under the term "au-d3", Can be got from
ebay for about a tenner.

Previously when I checked it out it was impossible to locate a spec
sheet for it or anyone who had actually opened one?

FWIW I've been in contact with CYP and am hoping for more info on the DAC
(and on some other items that may 'surface' in projects later).

I may also add a little more about the battery PSU side later. At present I
haven't even determined the size of the power connector! :-) It isn't the
usual 2-and-a-bit-mm i/d. But I found another connecter that fitted that I
had in a component tray without knowing the size! When I make sure of the
size I'll add it (and a part number) to the webpage.

However it may well be that people can find other DACs and transformers
that they prefer. As Arny pointed out, these small 'NTE4' ones do saturate
easily at LF. They seem fine for 20Hz up in this case since the AU-D3 only
gives about 1Vrms out for 0dBFS - not the 2Vrms common for CD players. That
said, my interest was in it being a 'cheap and easy-to-make' project that
someone could duplicate if they can solder and drill a few holes.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html