Identifying a Log Pot

Discussion in 'General Electronics Chat' started by geosync, Aug 8, 2009.

  1. geosync

    Thread Starter New Member

    Aug 13, 2008
    9
    0
    Are log potentiometers marked in any way to indicate their non-linear characteristics?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    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.
     
  3. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    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
     
  4. Papabravo

    Expert

    Feb 24, 2006
    10,140
    1,790
    A log pot wil have the resistances in a 31/69 ratio since the square root of 10 is about 3.16...
     
  5. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    Oriental audio pots are marked A for audio. Linear pots are marked B for who-knows-what.
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Confusing with an Allen-Bradley pot.
     
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