Author: DAMSTE (13-096.002.popsite.net)
Date: 06-26-2001 05:05
Fat Rakoon - It doesn't seem like resisters would alter the circumstance at all. Why not turn the volume down on whatever amp your using?
Anyway, I downloaded some schematics of the STE from:
http://chimo.unimo.it/~vezz/atari/hardware/docs.html
great site! lots of hardware hack info.
The STE DMA sound signal comes out of two D-to-A converters, goes through a simple low-pass filter, then through an interesting play-back frequency dependant filter, then through another low-pass filter, then through the tone-control chip and then out the back.
I found that the play-back frequency filter adds all that noise you hear (i don't know why). So my solution is to bypass that filter AND use ferrite beads (RF filters) on the ground and left-out and right-out connections. I am also bypassing the tone-control chip because it seems noisy too.
so i wonder still if there is a better way. Has anyone out there replaced the STE DACs using Filter DACs? or oversampling DACs?? (that'd be cool). Has anyone tried speeding up the sample clock?? (i'd like to try that)
-redspooker
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