• Re: PEC Linear pot vs Log tapered pot sound - bcherry 19:27:56 01/05/06 (4)
  In Reply to: PEC Linear pot vs Log tapered pot sound posted by Frank Mena on January 5, 2006 at 07:28:34:

  Yes i compared and there was a small difference with the linear pot being better. But the taper of the law faked pot is not like the audio taper log pot - the sound comes on very quickly the first 1/3 turn then increases in increasingly finer increments. If you can live with that, the linear is better.
  Brian
  Take control! DIY.
  
  

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  • Re: PEC Linear pot vs Log tapered pot sound - Thorsten 03:28:45 01/06/06 (3)
    In Reply to: Re: PEC Linear pot vs Log tapered pot sound posted by bcherry on January 5, 2006 at 19:27:56:

    Hi,

    Just a little addenda.

    You have some further room to "tune" the sound by choosing different "law-fake" resistors.

    Plus, linear pot's tend to track a LOT better at lower levels than Log ones, all this being in principle for all Pot's, not just PEC.

    As for the curve, it's easy to estimate.

    For example a 1M Lin Pot & 10K LF resistor for example will give 25db attenuation @ "3 O clock", 34db attenuation @ "12 O clock" and 39db @ "9 O clock".

    If we use a 1M Lin Pot & 47K LF resistor for example will give 13db attenuation @ "3 O clock", 22db attenuation @ "12 O clock" and 28db @ "9 O clock".

    Best thing is to work out the LF resistor for ones own system, setting the Volume control to 12 O Clock and selecting a LF resistor that gives comfortable average listening levels leaving around +/-10db adjustment range between 9 to 3 Oclock.

    Ciao T
    
    

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    • Re: PEC Linear pot vs Log tapered pot sound - Paul J. 14:49:35 01/08/06 (2)
      In Reply to: Re: PEC Linear pot vs Log tapered pot sound posted by Thorsten on January 6, 2006 at 03:28:45:

      Has anybody had FM noise issues with the Linear pot? I'm using a 1M (with 33k resitors) on a very basic NI chip amp circuit. I get a bunch of noise in the 99-100 bands, despite a fully shielded chassis and interconnects. Some folks on another board thought the 1M pot was the likely culprit, and suggested I try a filter below the pot. I was thinking of ordering a log pot rather than adding more circuitry.

      I don't want to hijack the thread, I just thought this might be a pertinent issue.

      Paul
      
      
      

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      • Re: PEC Linear pot vs Log tapered pot sound - Thorsten 02:50:08 01/09/06 (1)
        In Reply to: Re: PEC Linear pot vs Log tapered pot sound posted by Paul J. on January 8, 2006 at 14:49:35:

        Hi,

        > Has anybody had FM noise issues with the Linear pot?
        > I get a bunch of noise in the 99-100 bands,

        I am not sure what you are refering to, do you mean FM Radio and 99-100MHz?

        If so you can safely exclude the Pot from the list, I would suspect the pickup is via the speaker cables actig as aerials and the noise being tracked through the feedback loop. Try some ferrites on the speaker cables and maybe a bit of induactance added to the chipamp output....

        Ciao T
        
        

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        • Re: PEC Linear pot vs Log tapered pot sound - Paul J. 14:18:51 01/10/06 (0)
          In Reply to: Re: PEC Linear pot vs Log tapered pot sound posted by Thorsten on January 9, 2006 at 02:50:08:

          Thanks, I'll give that a try.

          Paul
          
          
          

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