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Logarithmic or linear potentiometers for volume and a 3 band EQ

Discussion in 'Audio' started by Pexy, Apr 6, 2020.

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  1. Pexy

    Pexy

    142
    3
    Feb 21, 2016
    Greetings!

    I am in a proces of going trough my junk pile to find all the components I need for a Bass guitar preamp.

    Looking at the schematic and the text that was posted about the project I can't find if I should use logarithmic or linear potentiometers.
    There should be one for each (volume, treble, bass and mid).

    The Scehematic is attached below.
     

    Attached Files:

  2. bertus

    bertus Moderator

    754
    268
    Nov 8, 2019
    Hello,

    Is there a link to the text you mention?
    The schematic does not show information on the type of potmeters.
    For volume regulation a logarithmic potentiometer is used.
    In the schematic the volume regulation is done in the gain regulation of the opamp.
    I think a linear potmeter should be used on that posistion.

    This page will show you more about the different types of potmeters:
    https://electronics.stackexchange.c...-use-a-logarithmic-pot-for-audio-applications

    Bertus
     
  3. Pexy

    Pexy

    142
    3
    Feb 21, 2016
    Hey Bertus.
    Thank you for the text about potentiometers
    The site I found the schematic is old and in serbian so I don't think you'll have much luck there but here's the link anyway
    https://bora.yu3ma.net/ the said project is under GITARSKA TEHNIKA>POJAČALA>BASS PRO_MASTER
     
  4. bertus

    bertus Moderator

    754
    268
    Nov 8, 2019
    Hello,

    There is nothing mentioned of the potmeters, even when I translated it using Google.
    Looking at the type of schematic, try linear potmeters.

    Bertus
     
  5. Pexy

    Pexy

    142
    3
    Feb 21, 2016
    yeah there was no mentioning of the pots.
    Thanks anyway I'll try both of them to see what works better.
     
  6. WHONOES

    WHONOES

    910
    226
    May 20, 2017
    I've built a few guitar amps over the years. For level control you definitely need a Log Pot. For the tone controls you will want Linear Pots. For the gain control you could use either type though a Linear type is probably preferable. I guess it depends on what you have in your bits box.
    If all you have is Linear pots, it is quite easy to get a rough approximation to a log pot using one resistor.
     
    Pexy likes this.
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