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Thread: Potentiometer value

  1. #1
    Join Date
    Dec 2006
    Location
    New Jersey
    Posts
    247

    Red face Potentiometer value

    Hello All

    Can any of you electronics guys out there help me with something very simple?
    I feel kind of dumb... =)

    I simply wanted to control image size and color intensity with some potentiameters..
    I have signals coming from my ADAT (X,Y,R,G,B)

    The question I have is.... What is the potentiometer value I will need?
    I never understood how to properly size a pot for a job.

    Can someone tell what size pots I will need for this job?

    Can someone expliain the extremely simple theory how to size the pot =)

    I know its simply ohms law..

    Thank!

  2. #2
    Join Date
    Jan 2007
    Location
    Sheepsville, Wales, UK
    Posts
    3,396

    Default

    The value you want isnt goint to be critical - a 10K pot would be a safe bet configured as a volume pot would be on the input to and amp (see image) J1 & J2 would be the input from the ADAT and J3 & J4 the output to the projector.

    Hope it helps

    Rob
    Attached Thumbnails Attached Thumbnails pot.jpg  

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  3. #3
    Join Date
    Mar 2008
    Location
    Canton, GA USA
    Posts
    384

    Default

    Ideally, you'd want a LINEAR-taper pot as opposed to a LOG-taper pot. Log-taper pots are used in volume-control applications. Linear-taper pots are used in signal-adjustment applications such as yours. See:

    http://en.wikipedia.org/wiki/Potentiometer

    Tim

  4. #4
    Join Date
    Dec 2006
    Location
    New Jersey
    Posts
    247

    Smile Thank YOU!!

    Rob / Tim

    Thank you so much for your help...
    This information is very useful and I can't wait to try it out.

    Best regards,

    Sean

  5. #5
    Join Date
    Mar 2008
    Location
    Canton, GA USA
    Posts
    384

    Default

    All's ya gots ta do is ask!!

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