Hi,

I have been working on reproducing the TDX Stereo Sound card using the
FAQ information as well as the slight modification using a quad amp as
already outlined by Polymorph.

My next stage is to get from breadboard and on to PCB in some form via
copper board etc. I am contemplating taking this further and actually
to get this fabricated and offer them back to the community at cost
for component and manufacture etc (i am not doing this to make money
lol). I still have things to sort out in terms of cable placements
etc, but i want to gauge interest if anyone would actually be after
one. I kinda reckon it will come to something like £30 - £40 for a
card....not really sure tbh.

If anyone is interested drop me a reply so i can see if its really
worth me getting them made etc.

If anyone has any other improvements to the TDX/Polymorph version then
drop me a note and I will try and encompass it into the card.

You can follow my progress at http://drewbiegs.blogspot.com

Cheers
Drew

On 31 oct, 00:16, Drew <goggled...@gmail.com> wrote:

Count me in, Drew.

antoine

On 31 Oct, 08:43, Toinet <antoine.vig...@laposte.net> wrote:

Kool, That is one :).

One thing i am having trouble deciding how much effort to put into is
getting the audio cable to the back of the computer. In fact the cable
bit and the audio connector is easy. I am struggling to find a plate
to mount on to the rear of the case. Anyone have any ideas of where i
can get a plate from? I haven't spent that much time looking as
currently i am going to just mount the 3.5mm jack to the card to get
the initial card done, but thought i would ask to see if anyone knows
an off the shelf part :).

Cheers
Drew

On Sat, 31 Oct 2009 02:47:30 -0700 (PDT), Drew <goggled...@gmail.com>
wrote:

Count me in, too!

- Mike

On Oct 31, 8:16 am, Drew <goggled...@gmail.com> wrote:

Drew, I had a quick look but couldn't tell:
Are you planning for this to occupy a slot?

Interested, but would prefer that it didn't occupy a slot.

Cheers,
Nick.

On Oct 31, 3:49 pm, sicklittlemonkey <nick.westg...@gmail.com> wrote:

Hi,

I haven't quite decided yet what to do. My initial idea was a slot
based card, but the more i think of this i might offer the card in two
variations with modular audio outputs as well. I.e a slot based card
and a no slot based card (In the testing of the breadboard all i did
was to wire directly in to the -5 and +5 of the power connector so in
theory i could use a piggyback connecter) all using the same
fundamental circuit. I will have a better idea of what is realistic
once i have a prototyope completed and tested in the next 2 weeks or
so to make sure all sounds clear and no issues come out in the chip
placement.

Once i get idea of cost to actually make the boards, I will post back
estimated costs. At the moment the component cost is only ~£9

Drew

Perhaps .. there's some interest in these things, too ..

http://17500mph.com/photos?g2_itemId=193

4772-b4e6-ad1aa1d1d...@b2g2000yqi.googlegroups.com...

Well, that would depend on what they are, wouldn't it?  ;-)

Bill Garber of Garberstreet Electronics
http://www.garberstreet.com

On Oct 30, 7:16 pm, Drew <goggled...@gmail.com> wrote:

Cool blog, Drew!

ATF

On Oct 31, 12:44 pm, td...@apple2.info wrote:

A daft question?

What are they?

Haha..

ATF

On Oct 31, 10:16 am, Drew <goggled...@gmail.com> wrote:

I always planned to make a run of these things too, except I never
managed to find the time. I am considering making another one for the
kids IIgs though, but if your price is right (and if I'm feeling
particularly lazy), I might even buy one of yours. Alternatively, I
might go into competition with you... lol  :-)

Maybe you could record something from the IIgs using the TDX and
compare the output to mine. The easiest way to do this is to blug the
output of the TDX into the line-in of a PC (or Mac) and record it
using whatever software you use to record sounds. I have mine
installed in a ROM3 IIgs, so I may get cleaner audio if yours in a
ROM01. But I have a ROM01 here I could hook up too, if required. I
actually have my IIgs permanently hooked up to the line-in of my
desktop so that it pipes through my Logitech 5.1 speakers (albeit only
in stereo). It sounds awesome!

I changed my board (ages ago now) to have the 3.5mm jack mounted to
the back of the case as opposed to directly on the card like it is in
the pics on my site. I hacked an old PC slot cover (the metal thingy
you use to cover unused slots) and screwed it into an unused slot
opening on the IIgs. But this just rounds out the real "hacker" look
to mine. I'm guessing you will want something with a tad more
polish.  ;-)

BTW, as a comparison, I remember mine costing around AUS$20 for the
components, when assembled on a prototype board. So I expect a
professionally done PCB would cost quite a bit more.

Anyway, good luck! I look forward to seeing the end result.

Cheers,
Mike

http://apple2.sytes.net/

In article
<937897db-561e-4a38-aaff-e13ad706c...@w19g2000yqk.googlegroups.com>,

I'm interested also.

--
Poster

www.intaligo.com  I6 libraries, doom metal, Building
sturmdrangif.wordpress.com  Game development blog / IF commentary
Seasons: fall '09 -- One-man projects are prone to delays.

Quite a few were explained in the headers...

I usually drill/cut a hole in a plastic slot cover for the NadaNet
adapter's RCA socket.  It has some "flex", but if you're careful
and don't plug and unplug a lot, it works just fine and looks good.

-michael

NadaNet 3.0 for Apple II parallel computing!
Home page:  http://home.comcast.net/~mjmahon/

"The wastebasket is our most important design
tool--and it's seriously underused."

On Oct 30, 6:16 pm, Drew <goggled...@gmail.com> wrote:

Drew,

depending on the cost I'd be interested in one.

Dean

  To: Toinet
  Re: Re: Apple IIGS Stereo Sound Card - Interest?
  By: Toinet to comp.sys.apple2 on Sat Oct 31 2009 01:43 am

 > On 31 oct, 00:16, Drew <goggled...@gmail.com> wrote:
 > > If anyone is interested drop me a reply so i can see if its really
 > > worth me getting them made etc.
 > >
 >
 > Count me in, Drew.
 >
 > antoine

I'd like to know more.

Sean Fahey
www.a2central.com
bbs.a2central.com

Hi,

Well i am in really early stages and will have more of an idea of what
i can achieve once i move on to a copper board. I have lots of ideas
on how to do things, but my end goal will be to try get the end
product looking professional. Though i will have to put the components
on myself i hope for the board, cables and connectors to all look as
if it was a real off the shelf product :) .

I will updating my blog as i go along, so check it to see where i am.
I don't have a completion date yet though.

Drew

Sorry if this is easy found info, but can somone explain to us newbs
what the benefits of this is?

I know the GS can produce stereo sound, and I know it only has a mono
output.

Does alot of programs support stereo sound?

And what exactly are you doing?  It's obvious it's more then making a
secondary jack for stereo, and I'd like to know what exactly your
doing, just for the learning factor.

thanks

On 1 Nov, 10:04, nyder <nyder...@gmail.com> wrote:

Hi,

Well what i am doing is nothing new and I am only putting something
together that other people have already worked on. The Apple IIGS
Hardware Reference book has a rough outline on what is required to
allow the IIGS to output Stereo sound and in 1992 Jeff Hurlburt
produced a circuit diagram of what would be required which you can see
in the A2 FAQ (http://home.swbell.net/rubywand/Csa2SOUND.html).

Polymorph used a quad amp rather than the two TL082 as you can see
from his website http://www.cirruscomms.com.au/~mike_stephens/apple2/TDX_Stereo_Card/i...
and i am using the TL084NI in the card i am producing. This means the
board only requires two ICs the demultiplexer and the amps (within one
package).

If you read the FAQ that should outline what is actually going on.

Hope that makes it clearer :-) and there are plenty of games that
support stereo sound.

Drew

On Nov 1, 9:04 pm, nyder <nyder...@gmail.com> wrote:

The IIgs has a socket on the motherboard that provides access to the
stereo signals (well actually, more than this but I digress). However,
a circuit like the TDX board is required to separate and amplify the
audio signals so that they are ready for listening - this is where
IIgs stereo boards come in. And yes, a lot of IIgs programs *do*
produce stereo sound. I would say many (most?) games do, and most
(all?) of the specific IIgs music creation applications do. Hooking a
IIgs up to decent speakers also helps, but if you use the mono plug
you most likely will only get audio from one speaker.

I would certainly recommend anyone to add a stereo board to their IIgs
if they really want to witness what the 'S' in IIgs really stands
for...  :-)

Cheers,
Mike

I'd be interested.

Jamie.

Hi Drew,

Count me in.

Also I wouldn't expect you to be able keep the cost that low although I have
every confidence that you will do your best:)

Regards,

Bill

Since a stereo demultiplexer simply puts all the even-numbered
Ensoniq channels on one side and all the odd-numbered channels on
the other side, any program that uses more than one oscillator will
produce stereo sound.

A smaller number of programs will have consciously assigned instruments
to even or odd oscillators to produce _intentional_ stereo sound.

-michael

NadaNet 3.0 for Apple II parallel computing!
Home page:  http://home.comcast.net/~mjmahon/

"The wastebasket is our most important design
tool--and it's seriously underused."

Hi Drew,

Will your board allow sound input as well as sound output? I mean
"numérisation du son" (sound digitization)

antoine

Hi Tony,

That would be good if Drew's board provided recording as well as playback
functionality. (i.e. ADC input as well as DAC output).

Bill