10K Potentiometer vs 100K Pot

[Laniakea]

So I built this circuit for my Logitech Sub as a control unit and I used a 100K Potentiometer becasue it's what I had in hand, but it is originally 10K. It is way more sensitive than it should be. So my question is if I use a 10K Pot, will it be more or less sensitive to turning the dial? Thanks :)

 

[kelvinhall05]

I might be wrong but I think the difference between a 10k and 100k pot is that the 10k has up to 10kΩ of resistance, while the 100k has up to 100kΩ of resistance. I don't think this would change how sensitive the adjustment is as they're both infinitely variable.

[Laniakea]

2 minutes ago, kelvinhall05 said:

I might be wrong but I think the difference between a 10k and 100k pot is that the 10k has up to 10kΩ of resistance, while the 100k has up to 100kΩ of resistance. I don't think this would change how sensitive the adjustment is as they're both infinitely variable.

I think it would make a diffrence, I can't rotate the current pot 1mm before the volume just increases so much, I have to adjust so carefully, 10K pot has a narrower range so I thought it might be better but I'm not sure.

[kelvinhall05]

1 minute ago, Laniakea said:

I think it would make a diffrence, I can't rotate the current pot 1mm before the volume just increases so much, I have to adjust so carefully, 10K pot has a narrower range so I thought it might be better but I'm not sure.

I mean maybe but I dunno. It can't cost more than like a dollar to try it out though.

[Laniakea]

1 minute ago, kelvinhall05 said:

I mean maybe but I dunno. It can't cost more than like a dollar to try it out though.

Can't go outside remember?  

[vf1000ride]

The difference in the sensitivity comes from the ratio of the change in resistance per degree of rotation.  Assuming they both rotate the same amount and are both linear from zero to max the 0-10K pot will change a smaller amount of resistance per degree due to the 0-100K needing to cover 10 times the resistance in the same number of degrees of rotation.

[mariushm]

100k is too much

Try a 47k potentiometer but it would be best to use 10k

 

 

 

[mariushm]

Another option would be to add resistors in parallel (two resistors, one between each side pin and the wiper pin)

1 / R = 1/R1 + 1/R2 

1/R = (R1+R2) / R1xR2

 

=> R = R1xR2 / (R1+ R2)

 

So if your 100k is in the middle you basically have  start ---> 50k resistance---> wiper pin ---> 50k resistance -->

 

so if you put a 10k resistor in parallel 

 

R = 10*50 / (10+50) = 500 / 60 =  8.3 kOhm

 

At maximum wiper, your 100k potentiometer will be

 

R = 10 * 100 / (10+100) = 1000/110 = 9kOhm  .... close enough to 10k

[Grabhanem]

It looks like in that circuit they are already sort of doing what @mariushm said, using resistors in both series and parallel to correct the range. Therefore unlike most potentiometer circuits the resistance of the pot does actually matter.

 

You could in theory replace all the resistors on the right with 10x the value, but it probably wouldn't be worth the trouble.

[DrDsNo1]

The potentiometer is part of voltage divider circuit consisting of r102, r103, r104, r105, and r106 . If you want to use a 100k pot then you have to mutiply the values of the other resistors by 10. This brings the pot back in to proportion with the others.The sensitivity of the  circuit will be decreased this way.

[Pixel5]

are you sure this is a normal pot in there by default?

most audio stuff uses special Potentiometers that are not linear because the relation between power supplied to a speaker and the volume is not linear.

[mariushm]

16 minutes ago, Pixel5 said:

are you sure this is a normal pot in there by default?

most audio stuff uses special Potentiometers that are not linear because the relation between power supplied to a speaker and the volume is not linear.

Alps RK097 series potentiometers : https://tech.alpsalpine.com/prod/e/pdf/potentiometer/rotarypotentiometers/rk097/rk097.pdf

 

The exact numbers are in the datasheet and the schematic so you can figure out exactly what properties the potentiometer has.

[Enderman]

A 10k pot will make it so that a certain amount of rotation will cause less change, therefore making it feel "less sensitive"

Your 100k pot is making it 10x faster.