22K Log conductive plastic pot

"Ian Bell" <

Connect the two sections in tandem - ie, the wiper of the first goes to the top of the second.

The law is then close to log.

25% = -24dB

70% = -3dB.

..... Phil

Thanks for that Phil, it is something I had considered and it has the advantage that the law is much more repeatable. Unfortunately I should have been more specific about the application and in this case I need the log(ish) law but it is not to be used as a potentiometer but as a variable resistance (in an equaliser). As far as I can see, cascaded linear pots do not give that - for example the total resistance from the second wiper to ground at the 50% point is 10K. Is there some other way of connecting a pair of linear pots to give an approximate log law resistance between two terminals??

Ah, I just realised if I connect the second wiper to its upper terminal I get 6.25K at the mid point - that might just do it.

Cheers

Ian