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Concentric 250k/250k pot?

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11/6/2002 7:15 AM

Concentric 250k/250k pot?

Hello peoples.

For my simultaneous passive tone/volume pedal, It seems best to go with a concentric pot, and I'd like to use 250k's. The only concentric pots I've seen were 500k...why is this?

Even with a concentric pot, I'd still have to have 2 different levers moving the pots...Would there be a way to stick a single sized shaft through both pots requiring only one lever to move both?

thanks!

11/6/2002 5:55 PM
Mike Cornett	found some from torres, thanks.

11/6/2002 7:40 PM
Mike Cornett	I'd like to make one pot (the volume portion) move from 0-10 much quicker than the other (tone)...How could this be made possible using a single shafted dual pot?

11/7/2002 3:35 PM
Manolo Dudes	If it's a dual ganged linear pot, make the volume part logarithmic adding a tapering resistor. Put a 25K resistor between wiper and the CCW terminal. http://www.geofex.com/Article_Folders/potsecrets/potscret.htm

11/7/2002 3:37 PM
Manolo Dudes	Ooops!... I meant 50K resistor. The key is more or less 20% of the pot nominal value.

11/8/2002 11:07 PM
Mike Cornett	I really appreciate this...The geofex site is so messily organized I can rarely find what I want... I assume the resistor adds the level of tapering? Without sounding too harsh, my goal would be to have the first 20 or 30% of the rotation to be a swell from 0-9, then the next 80% to be at full 10 level.

11/9/2002 7:52 AM
Mike Cornett	I've read of people putting 220k resistors on 250k pots to achieve something similar...does that sound way off?

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