Make a LOG pot out of a LIN pot?
- kierc
- Breadboard Brother
Information
- Posts: 124
- Joined: 24 Aug 2008, 12:43
- my favorite amplifier: Vox Cambridge 30 R Twin
- Completed builds: Clyde McCoy Wah with Whipple+Red Fasel inductor switch, Fuzz Face with own layout
- Location: Bristol, UK
- Contact:
Hi,
Is it possible to say get a 100k Lin pot, do some electric voodoo, and end up with a 100k Log pot??
I did a googley search but most stuff is amp related, but I found something that said a resistor of about 20% value of the pot across lugs 1 and the wiper would create a Log pot... would this work for pedals?
Thanks!
Kier.
Is it possible to say get a 100k Lin pot, do some electric voodoo, and end up with a 100k Log pot??
I did a googley search but most stuff is amp related, but I found something that said a resistor of about 20% value of the pot across lugs 1 and the wiper would create a Log pot... would this work for pedals?
Thanks!
Kier.
- lolbou
- Old Solderhand
By adding a 10k resistor between pin one and wiper. (see image)
edit: if you have a 4k7 lin pot, then add a 470 ohms resistor, and so on...
Try this http://www.sonelec-musique.com/logiciel ... curve.html, still from http://www.sonelec-musique.com which a french site I simply adore...
edit: if you have a 4k7 lin pot, then add a 470 ohms resistor, and so on...
Try this http://www.sonelec-musique.com/logiciel ... curve.html, still from http://www.sonelec-musique.com which a french site I simply adore...
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- pot_avec_res_002_lin.gif (2.57 KiB) Viewed 1811 times
- Are you a mod or a rocker?
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- Uh, no, I'm a mocker.
- kierc
- Breadboard Brother
Information
- Posts: 124
- Joined: 24 Aug 2008, 12:43
- my favorite amplifier: Vox Cambridge 30 R Twin
- Completed builds: Clyde McCoy Wah with Whipple+Red Fasel inductor switch, Fuzz Face with own layout
- Location: Bristol, UK
- Contact:
Cheers for that
So it's 10% of the value?
Also, that's looking at the back of the pot right?
Am I right in thinking (from that French site) that if the resistor is placed on the other side it will create a reverse-log pot?
Cheers for the speedy helpful reply
So it's 10% of the value?
Also, that's looking at the back of the pot right?
Am I right in thinking (from that French site) that if the resistor is placed on the other side it will create a reverse-log pot?
Cheers for the speedy helpful reply
- lolbou
- Old Solderhand
yes. when you lower the resistance value (starting from the pot value), then you lean towards a log curve. This very log curve is almost reached for 10% of the value.kierc wrote:So it's 10% of the value?
kierc wrote:Also, that's looking at the back of the pot right?
yes again. the resistor goes between the "zero lug" and the center lug.
that's it. french ain't that difficult, uh?kierc wrote:Am I right in thinking (from that French site) that if the resistor is placed on the other side it will create a reverse-log pot?
Here's the english by famous R.G. Keen... http://www.geofex.com/article_folders/p ... tscret.htm
My pleasure!kierc wrote:Cheers for the speedy helpful reply
- Are you a mod or a rocker?
- Uh, no, I'm a mocker.
- Uh, no, I'm a mocker.