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Difference between trim-pot and log pot

Discussion in 'General Electronics Discussion' started by cyberteen, Mar 16, 2012.

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  1. cyberteen

    cyberteen

    48
    1
    Dec 4, 2011
    Hi,

    Can anyone explain me about the difference between trim-pot and log-pot.
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,271
    2,718
    Jan 21, 2010
    That's like asking the difference between a cat and a catfish.

    A trimpot is a potentiometer that is typically adjusted by a screwdriver to set some circuit parameter, but is typically not adjusted once set.

    A log pot is a potentiometer with a logarithmic taper. That is the resistance varies logarithmically with rotation of the shaft. These are typically used for volume controls because the human ear has a non0linear sensitivity to changes in the intensity of sound.
     
  3. shrtrnd

    shrtrnd

    3,688
    457
    Jan 15, 2010
    Like *steve* said.
    I think whoever told you those two terms, MEANT a 'trim pot' to be one where the
    resistance across the travel of the wiper to be linear.
    As opposed to a 'taper' or logarithmic resistance used in volume control applications.
    They're both generically called trim-pots.
     
  4. cyberteen

    cyberteen

    48
    1
    Dec 4, 2011
    Is there by any chance their places are inter changeable, i mean, can i replace a 10k log pot by an 10k trim-pot?

    By the way I'm sorry for my silly questions and thanks in advance.
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,271
    2,718
    Jan 21, 2010
    Only if it's a 10k log trim-pot -- then it's the same thing.

    Otherwise you're asking something akin to "can I replace a 3 litre engine with a petrol engine?" -- ok if both are 3 litre petrol engines, but not if one is a 3 litre diesel engine and the other is a 1600cc petrol engine.

    trim-pot describes an aspect of the physical nature of the thing (essentially that it doesn't have a shaft that you can fit a knob to. "log" describes how the resistance changes as you rotate the control -- in theory there is no particular relationship between the two.

    Having said that, log trimpots are relatively unusual, but not impossible to find
     
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