Slide Potentiometers resistance...
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  1. #1
    Tech Wizard
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    Default Slide Potentiometers resistance...

    Hi i am modding my midi mixer and would like to change the slide potentiometers. there are lots of them available however they all come in different resistances. how can i figure out what resistance would be the right one.
    its a small usb powered midi controller. the cable used are really small, so i think the resistance has to be really low. how can i measure the actual intensity and what else do i need to calculate the resistance. afaik its intensity I and power P which would be the easiest to measure.

    Spannung U = Volt V
    Stromstärke I = Ampere A
    Widerstand R = Ohm Ω
    Leistung P = Watt W


  2. #2
    Tech Wizard
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    could it be, that if its usb powered and thus delivers +5Volt at 500mA the resistance is 5/0.5 = 10 ohm which means the maximum resistance of the slidepotentiometer i can buy has 10 ohm right

  3. #3
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    hm the smallest slide potentiometer i cna find online have 1000 ohm ??? going up to 1.000.000 ohm... :-/ something must be wrong in my calculations then

  4. #4
    Tech Mentor Anthony More's Avatar
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    I think 10k is good.
    as comparison;In the vci-100 all potentiometers/sliders are 10k.
    and its also usb powered.
    Macbookpro 2.4 i5 4gb
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    Black VCI-100 Mod firmware 1.3
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  5. #5
    Tech Wizard
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    thank you, another opinion would be appreciated.

  6. #6
    Tech Wizard
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    btw anthony, how do you know that the vci ones are 10K ?

  7. #7
    Tech Mentor Anthony More's Avatar
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    Quote Originally Posted by KLOSELINE View Post
    btw anthony, how do you know that the vci ones are 10K ?
    Look here;
    http://www.djtechtools.com/forum/showthread.php?t=2545
    Macbookpro 2.4 i5 4gb
    Traktor Pro 1.2.6.
    Black VCI-100 Mod firmware 1.3
    Presonus Firebox

  8. #8
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    hey what i meant is, can i see on the faders whats the ohm, so i coudl figure out how much ohm sliders are installed in my midi controller.

  9. #9
    Tech Mentor Anthony More's Avatar
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    Quote Originally Posted by KLOSELINE View Post
    hey what i meant is, can i see on the faders whats the ohm, so i coudl figure out how much ohm sliders are installed in my midi controller.
    I don't know what controller you have and what sort of faders.
    You have to open up the controller, take the fader out, and take a close look
    at it.
    Look for some code.
    Or try to find an similar fader on the market (mouser,Farnell),and compare
    for specs.
    This is the way I did It.
    Macbookpro 2.4 i5 4gb
    Traktor Pro 1.2.6.
    Black VCI-100 Mod firmware 1.3
    Presonus Firebox

  10. #10
    DJTT Super Moderator midifidler's Avatar
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    Pots are balanced so the resistance only matters to limit current.

    10 K will be fine in all situations.

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