Re: Apple IIGS Stereo Sound Card - Interest?

[Drew <goggledrew@gmail.com>]

On 24 Nov, 14:22, Drew <goggled...@gmail.com> wrote:
> I was looking at another example Stereo card that was published in a
> french magasine, and interestingly their design places an OP-Amp
> (LM318) between J25-3 (waveOut) and the MC1402B and a SN7407 hex
> buffer between J25-4/6 and the MC1402B IC...sounds like they did this
> to clean up the signle before being split out.
>
> Drew

Hi, me again :)

Right i attached a floppy drive and using the drive whilst listening
to sound didn't make any difference to the white noise. I switched
round the output from the MC1402B (demux) and the white noise shifted
from right to left. This i would say eliminates the OpAmp TL084 imo.

I am at the moment just attaching a standard pair of headphones to
test with as don't actually have any powered speakers and the line in
to my pc doesnt seem to want to work lol (headphones work fine on
iphone...so don't suspect the headphones). I do have another pair of
better headphones that have a volume control and it would seem that
they don't have the white noise, well it doesn't seem so obvious.

Is it possible that though the card is outputting whitenoise that
certain speakers/headphones will take out the white noise?

Cheers
Drew