Re: Wishing to build a stereo card

[julichjh@malachi.Rose-Hulman.Edu (Joseph H. Julicher)]

In article <31f7vn$rks@manuel.anu.edu.au> stu@aerodec.anu.edu.au (Stuart David  
Midgley) writes:
> 
> HI
> 	I am studying a computer interfacing subject as part of my degree at
> The Australian National University, and I would like to build a stereo
> card for my GS (as my major project).  Does anyone out there know how I
> should go about building this, and what pin-out configurations I should
> use for the slots in the GS.  Any information regarding this would be
> most greatful.  People may also like to tell me if they think this is a
> bad idea.  I may be an over enthusiastic solder iron wielding student,
> wish to create havok in the lab (un-intentionally of course.)
> 
????????
If you want to build a card that takes the Ensoniq output and separates
it into left and right signals then a single 4051 analog 8 channel mux/demux
feeding a low pass filter/buffer.  One filter/buffer for each channel.
The filter/buffer can be made from a lf353 dual opamp.  use one opamp for a 
filter and the other to make a unity gain follower to give the ouput a line 
level drive.  A nice pcb layout to reduce noise and power everything off of
a card slot.
Presto an 8 channel audio demux with nice sound (assuming good layout practice)
All the signals come off of the ensoniq port.
------
If your idea of a stereo card was different let me know.  I have many ideas.
Joe Julicher
Senior Computer Engineer
Rose-Hulman Institute of Technology