Welcome! Need support, you got it. Or share you ideas and experiences.
Hi Brian , did you ever compare the two and notice a sound difference?
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.
Take control! DIY.
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.
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.
> 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....
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