DIYstompboxes.com

DIY Stompboxes => Building your own stompbox => Topic started by: Russ on January 13, 2004, 02:06:51 AM

Title: Help! Correct Mosfet Booster pot taper?
Post by: Russ on January 13, 2004, 02:06:51 AM
Hi guys,
I've recently built a Mosfet Booster (BTW, great pedal, Jack!), and am wondering- exactly what is the correct pot taper to use? I've used a 5K log taper wired to increase with normal clockwise rotation, but it seems as if the majority of the boost is accentuated in the latter half of the rotation.
Do I need to be using a linear taper, or does the circuit actually need a reverse log taper (in which case I'd simply reverse the wiring on my log pot and have it increase with counter-clockwise rotation)?
In a nutshell, with which pot taper is the boost most gradual?
Any help would be appreciated.
Thanks, Russ
Title: Help! Correct Mosfet Booster pot taper?
Post by: Boofhead on January 13, 2004, 05:56:41 AM
QuoteIn a nutshell, with which pot taper is the boost most gradual?

A reverse log will be more gradual, no question about it.

In practice a linear will work fine and if it's a hassle getting a reverse log I wouldn't bother with one.
Title: Help! Correct Mosfet Booster pot taper?
Post by: amz-fx on January 13, 2004, 06:43:03 AM
Yes, reverse log taper or a similar type of pot would have the smoothest response over the full turn of the control....  it could be hard to find one in this value.

regards, Jack
Title: Help! Correct Mosfet Booster pot taper?
Post by: RDV on January 13, 2004, 07:16:30 AM
I believe even Z.Vex uses a linear taper in the SHO putting the majority of the boost at the end of the pot.

Regards

RDV
Title: Help! Correct Mosfet Booster pot taper?
Post by: downweverything on January 13, 2004, 11:16:22 PM
or to fake the reverse log you can hook a log up backwards.  the only thing is more gain would be counterclockwise.  i just used a linear in mine.