Swap 250k trimmer for 250k pot?

[nonsuchpro]

Hey all.
Not sure if this is the right place to ask, please move it if so.
I am building this Velleman preamp kit and want to swap out the 250k trimmer for a 250k pot and knob. My question is which type do I need... audio taper or linear taper?

Velleman nv

Thanks in advance!

 

[Groundloops]

Get a linear one.

 

[AndrewT]

I can't see a schematic.
But I guess at two alternatives.
1.) if you want to use the pot as a volume control, then use an audio taper pot, also called a log law pot.
2.) if you want to use the pot as a sensitivity control, then use a linear pot. That way you can set to 50% or 10% by estimating the rotation angle as a proportion of the total adjustment angle (usually about 270degrees).

 

[nonsuchpro]

Thanks guys! I will go with linear

 

[nonsuchpro]

One more quick question... I have a 1M pot brand new I never used from another project. What would happen if I used that instead of 250k?

Here are the schematics:

 

[macboy]

You could put the 1 Mohm pot in parallel with a 330 kohm resistor. This will create a ~250 kohm pot with a non-linear taper. The non-linear taper could be a good thing since this is a gain control. It will provide a more natural feel when adjusting than a simple linear pot.

 

[nonsuchpro]

You could put the 1 Mohm pot in parallel with a 330 kohm resistor. This will create a ~250 kohm pot with a non-linear taper. The non-linear taper could be a good thing since this is a gain control. It will provide a more natural feel when adjusting than a simple linear pot.

Thanks

 

[Speedskater]

A pot in the feedback loop of an op-amp will be very sensitive to lead wire length. Try to keep the pot's wires as short as possible.

 

[nonsuchpro]

A pot in the feedback loop of an op-amp will be very sensitive to lead wire length. Try to keep the pot's wires as short as possible.

2-3"s is that too much?

 

[AndrewT]

Yes.

 

[nonsuchpro]

Well I build it but it doesn't work :/ I suck at soldering I'm sure that is why.