I am looking for a UK source of a 22K or 25K log panel mounting
conductive plastic or cermet pot. I have checked Farnell, RS, Rapid and
Maplin to no avail.

Cheers

Ian

"Ian Bell" <

** Use one of these 50K dual linear pots:

http://uk.farnell.com/vishay-sfernice/p9a2r100fisx1503ma/pot-linear-d...

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.

10%    =   -40dB

25%   =    -24dB

50%   =    -12dB

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