Identifying a Log Pot

Thread Starter

geosync

Joined Aug 13, 2008
9
Are log potentiometers marked in any way to indicate their non-linear characteristics?
 

beenthere

Joined Apr 20, 2004
15,808
If there is a manufacturer's name and part number on the pot, you can get that information from the web site. You can also use a meter and observe the change in resistance over a few degrees at either end of travel. A log taper will show much more change in resistance at one end than the other.
 

hgmjr

Joined Jan 28, 2005
9,029
Another quick check is that when you set the potentiometer to the approximate midpoint, the two resistances will be pretty nearly the same value if the pot is linear.

hgmjr
 

Papabravo

Joined Feb 24, 2006
12,301
A log pot wil have the resistances in a 31/69 ratio since the square root of 10 is about 3.16...
 

Audioguru

Joined Dec 20, 2007
11,251
Oriental audio pots are marked A for audio. Linear pots are marked B for who-knows-what.
 
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