Need help with LFO issue

[Govmnt_Lacky]

I recently built a flanger pedal and I have a question regarding the LFO.

I am using a Linear taper pot for the Rate (as per schematic) and I find that as I turn the rate pot CW, it gets much too fast far too quickly. I want to "stretch" the slower sweep a bit farther.

I know I can possibly change tapers to aleviate this but, I am wondering which taper would work in this situation. Log or Rev Log?

[haveyouseenhim]

I'm pretty sure you need log taper:

http://www.geofex.com/Article_Folders/potsecrets/potscret.htm

There's a chart about halfway down.

[Fender3D]

I'm pretty sure you need log taper...

Rev log 

[Govmnt_Lacky]

Well... two opinions here 

I guess there is nothing left but to try BOTH 

Cheers gents!

[armdnrdy]

I'm going with reverse log as well!

[Mark Hammer]

LFO speed is going to depend on how quickly a cap can be made to charge up.  More resistance limits the current available to charge that cap up very quickly, and less esistance allows it to charge up PDQ.  If you need to be able to dial in finer gradation of small resistances, AND you want clockwise rotation to increase speed, then you want rev-log.  If you don't mind clockwise being "slower", then log with reverse wiring is fine.

[haveyouseenhim]

LFO speed is going to depend on how quickly a cap can be made to charge up.  More resistance limits the current available to charge that cap up very quickly, and less esistance allows it to charge up PDQ.  If you need to be able to dial in finer gradation of small resistances, AND you want clockwise rotation to increase speed, then you want rev-log.  If you don't mind clockwise being "slower", then log with reverse wiring is fine.

Ah. that makes it more clear. My head still hurts though. I was thinking in terms of the voltage output of the pot, and not that its controlling the caps charging speed. derp

[Govmnt_Lacky]

Kudos Mark. Very well put!

Thanks! 

[senko]

I'd also add that having a Coarse & a Fine control for certain functions helps dial in the tones you're looking for.  For example, wire a 1k and a 100k pot in series and you'll have a very versatile method of finding the right settings.