[NBLUG/talk] a problem with audio noise

[jezra]

That is definitely above my head as far as electronics is concerned.
The noise isn't just a buzz. When I SSH into the machine and run
command with a lot of text output, there is associated noise with the
output. It reminds me of revving the engine in my car and hearing an
associated buzzing in the radio.


> A few thoughts.  If the supply that you are putting the cap across is 
> 5.0v, I would use a minimum of a 15v cap.  Also consider the output
> of the bridge rectifier.  If it goes into a pass element
> (transisistor- 3055 or whatever), think about the pass element
> shorting and the input volts going across the cap.  In that case,
> bump the volts.  I saw this earlier and the OP is not in the current
> msg.  Are you sure the noise you are trying to attenuate is from the
> Power Supply?  Try providing a pure DC (battery?) input to the power
> circuit and see if you have the buzz.  If so, it ain't the ps.  The
> word buzz make me think of a square wave as opposed to a 120 hz tone
> which the cap would attenuate in the PS.  Computers generate square
> waves, with beaucoup harmonics.  I don't have a solution for you if
> you are trying to get rid of square wave noise generated by the
> computer's clock.
> 
> Just a thought,
> 
> John
> 
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