🚀 go-pugleaf

HARVEY@SLACVM.SLAC.STANFORD.EDU writes:

>I am looking for the circuit to output sounds through the parallel port.
>The schematics in the MODPLAY package are difficult to understand. Does
>anyone out there have a better schematic for this circuit. Any help
>will be gratly appreciated. My computer understands Orcad, Pads , Gifs as
>well as Postscript.

No schematic needed.  Connect an R-2R resistor network across the bits
of the port.  Viola, instant D/A.  This is what the covox talker
does.  If you can't find a network, you can make one yourself.

          2 * R
bit ----VVVVVV-------+
                     /
					 \
					 /  R
                     |
bit ----VVVVVV-------+
                     /
					 \
					 /
                     |
bit ----VVVVVV-------+
                     /
					 \
					 /
                     |
MSB ----VVVVVV-------+---------------- out

John
-- 
John De Armond, WD4OQC               |Interested in high performance mobility?  
Performance Engineering Magazine (TM) |
Marietta, Ga                         |Interested in high tech and computers? 
jgd@dixie.com                        |Write me about PE Magazine
Need Usenet public Access in Atlanta?  Write Me for info on Dixie.com.