5kC vs 10kC

[chongmagic]

I am working on a pedal that lists a 5kC pot for fuzz level, but all I have is 1kC and 10kC pots.

Here are the build docs.

https://www.dropbox.com/s/67g2txnnvkg7ord/penumbra_documentation.pdf?dl=1

 

[benny_profane]

Depends on the purpose and load required, but you can put a 10k resistor in parallel across the relevant lugs and change it to 5k. The sweep will be affected, however. You can’t change a 1k to 5k and retain full sweep.

 

[chongmagic]

Thanks Benny, I will just wait and order a C5K pot.

 

[Boba7]

In that configuration a 10kC with a 10k in parallel will work fine I think

 

[benny_profane]

Do you have a 10kB pot? The affected sweep might actually be similar to the 5kC if you use the parallel resistor. I can do a simulation later today.

 

[chongmagic]

Do you have a 10kB pot? The affected sweep might actually be similar to the 5kC if you use the parallel resistor. I can do a simulation later today.

Yes I believe I have plenty of 10kb pots.

 

[benny_profane]

Found this graph someone already made. I believe the plotting is correct. It’s not as extreme as a true inverse log, but it’s getting there.

plot y=1/(1/R+100/Rx) and y=Rx/200 where R=10000 from x=0 to x=100 - Wolfram|Alpha

Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

www.wolframalpha.com

 

[Chuck D. Bones]

Since there is already a 2.2K in parallel (R7), there's no need to add another resistor in parallel with a 10K pot.

If you tend to use the top half of the FUZZ pot's rotation, then C1K would be fine.