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Post new topic How to get an even taper with a large (dark) tone cap
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Author Topic:  How to get an even taper with a large (dark) tone cap
Steven Welborn


From:
Ojai,CA USA
Post Posted 31 Aug 2017 3:59 pm     Reply with quote

Anyone know how to solve the problem quoted below?

"I often receive e-mails and calls from guitarists who don’t use the tone control at all, mostly complaining about tones that are darke and lifeless, hotspots when closing the tone pot, and a basically useless taper of the tone control. I’m sure you’ve experienced the last problem; when closing your tone control, all changes occur between 10 and 8, and from 8 all the way to 0 there is no audible change of your tone."

I rigged a tone pot into my National D8 to get that vintage western swing 'wah' effect using a large cap to contrast from very dark to hopefully not effecting the tone at all when pot is wide open. But it's difficult to operate due to issue quoted above. Anyone know how to correct this?

I used a linear 250k pot btw.
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Steven Welborn


From:
Ojai,CA USA
Post Posted 31 Aug 2017 5:43 pm     Reply with quote

p.s. even if the problem were in reverse it would be preferable.
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Georg Sørtun


From:
Mandal, VA, Norway & Weeki Wachee, FL, USA
Post Posted 31 Aug 2017 5:45 pm     Reply with quote

Yes, that's a well-known problem.

A 'reverse-logarithmic' pot would do the trick, but good luck with finding one.

A regular 'logarithmic' pot connected in reverse, will also work as intended. May be difficult to get used to it working in reverse though.

A good approximation would be to use a linear pot in the 1.5 - 2.2 Mohm range, with a 330Kohm resistor in parallel. Works the right/expected way, and spreads the "tone control" effect over a wide range of the pot-turn.


FWIW: linear pots can be made to emulate just about any curve found in non-linear pots, by calculating what (usually larger) value the pot must have and what resistor-values that should go between fader terminal and either, or both, end terminals.
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Steven Welborn


From:
Ojai,CA USA
Post Posted 1 Sep 2017 7:07 am     Reply with quote

Great thanks GS. I'll try those options you listed and see which works best.
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