Re: Q and D Stereo board?-- do-it-yourself TDX Stereo Board

[Rubywand <rubywand@swbell.net>]

Delfs writes ...
> 
> This leads me to ask if anyone has made a Q&D schematic 
> of a stereo mod for the IIgs to get stereo output?
> I'd like to make such a mod and hook powered
> speakers to it or maybe even run it to my stereo.
> 
> The reason I ask is that I have heard several times about the IIgs actually
> being a stereo synthesizer with it's outputs mixed into mono on the output, 
> even at the headphone jack.
 ....

     Right. The IIgs output at the Sound jack is mono-- everything mixed
together. The jack requires a stereo mini-plug; but, the two lines are
connected inside at the jack.

     The signals needed for getting separate channels are at the J-25 connector
located near the memory expansion slot. Using a multiplexer IC you can
de-multiplex the signals and get two channels of sound. (There is a raw diagram
for doing this in the Apple IIgs Hardware Reference.)

     If you would like to build your own stereo card, see the discussion,
directions, and diagram for making the "TDX Stereo Board" in the Apple II FAQs
at http://home.swbell.net/rubywand/Csa2SOUND.html#005 .



Rubywand