Center tapped pots?

[weiss]

These are generally not widely available in small quantity.

In many cases you can get away with standard linear taper pots.

Detents and center tapped pots are different animals. Center-tapped, an extra contact mid pot was historically popular for automatic loudness compensation... (bass boost at low volume settings). A more modern application for center tapped pots is back grounding boost/cut EQ pots at mid position to insure flat transfer function when set flat.

Center detents are more of a cosmetic issue to infer precision that may not exist.

I used to suggest buying similar parts from the service department of manufacturers still using them. These days with so much large scale manufacturing performed overseas service parts are an old school luxury harder for modern manufacturers to support.

Have you tried the circuit with a standard linear part?

JR

Are you sure you need them? for what?

Thanks guys. I know the differences and theory behind it.
I need center tap AND center detent. It is for a "cheaper" net eq i am building and i will use it for freq boost/cut. The only thing i was not able source were the pots.

 

[weiss]

What about this: https://www.mouser.mx/datasheet/2/54/ptvptt-778065.pdf

Thanks for the find but seems like mouser don't offer them. They only offer one 10k lin potentiometer of the CT series (called PTT by bourns) and it has no center detent 

 

[gyraf]

..in the net-eq, the two sides of the boost/cut pots have same-signal-opposite-polarity iirc, so you should be able to just use a non-center-tapped. Did you try?

/Jakob E.

 

[weiss]

..in the net-eq, the two sides of the boost/cut pots have same-signal-opposite-polarity iirc, so you should be able to just use a non-center-tapped. Did you try?

/Jakob E.

jup, not working. https://groupdiy.com/index.php?topic=33256.520

 

[weiss]

Just to update this thread. PS Potentiometer service (german company) still produces potentiometers with center tap and center detent. They can modify just about anything else for you. Although they cost 8.5€ per potentiometer.

https://alphastat.de/

 

[METALxHIPPIE]

I just pulled some 10K & 250K out of my old Peavey XR600B mixer. Gonna test the 250K in the wiring for one of my basses