Are there pots with steep taper at extremes, and gradual in middle?

[ItsGiusto]

In building this tremolo, I'm trying to get a more usable range of the depth pot.
I was wondering if there are any pots that have this sort of "inverted S" taper:



The key would be that it has a quick jump up from either end, but the center has a more gradual taper than either extreme.

[idy]

That is very close to what is called S taper

https://www.potentiometers.com/potcomFAQ.cfm?FAQID=29

[ItsGiusto]

That is very close to what is called S taper

https://www.potentiometers.com/potcomFAQ.cfm?FAQID=29

Seems to me to be the inverse of what you call S taper. The S taper seems to have gradual taper at extremes, but be steep in the middle, but I'm looking for the opposite.

[idy]

Also W taper, used in Tube Screamer tone control and so available

https://groupdiy.com/index.php?topic=56985.0

[idy]

DIY version at the bottom of the page

https://sound-au.com/pots.htm

[ItsGiusto]

DIY version at the bottom of the page

https://sound-au.com/pots.htm

Thanks so much! This is exactly what I was looking for. Sounds like if I want a 250k w-taper pot, I can do something like put a 330k resistor between leg 1 and 2 and leg 3 and 2.

[idy]

Hack away! Folks will tell you that even simple tapers are not very accurate and that "engineers" who need precision will today use micro controllers that are very cheap, cheaper than pots. There is also the option of scraping away at the resistive track to see what happens. But the taper resistors path may be as good as it gets.

[ItsGiusto]

I did some calculations and graphed it. It seems like it should work. This is what I got for the equation for the taper, where x is the fraction of our sweep through the pot, and r is the fraction of the pot that we use for the leg-resistors:







Here's the graph if we set r = .3 (for example using a 1M pot and 300k resistors from leg 2 to each leg 1 and 3). Of course, as with any pot tapering, the total resistance won't remain 1M, it'll be ~230k now.