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IndustryArena Forum > WoodWorking Machines > DIY CNC Router Table Machines > Reducing noise by using a capacitor.
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  1. #1
    Join Date
    May 2010
    Posts
    0

    Question Reducing noise by using a capacitor.

    Hi,

    I'm attempting to wire up a Z zero plate and after some discussion on the forum,

    http://www.cnczone.com/forums/diy-cn...ml#post1100345

    It appears that I'm getting to much noise on the pin that I'm using. It was suggested that I use a capacitor to reduce the noise, but I'm not sure how to wire it up, I'm hoping someone on the forum has had this issue, and can help.

    Thanks for the help,

  2. #2
    Join Date
    Apr 2006
    Posts
    3206
    Since no one else is jumping in here....
    I'm guessing you need a band-pass filter, a simple RC circuit.

  3. #3
    Quote Originally Posted by KnotsAboutWood View Post
    Hi,

    I'm attempting to wire up a Z zero plate and after some discussion on the forum,

    http://www.cnczone.com/forums/diy-cn...ml#post1100345

    It appears that I'm getting to much noise on the pin that I'm using. It was suggested that I use a capacitor to reduce the noise, but I'm not sure how to wire it up, I'm hoping someone on the forum has had this issue, and can help.

    Thanks for the help,
    Hi,
    I just fixed my noise problem on the Z zero auto tool set. My problem was that i was mounting my fixed tool setting height fixture on an aluminum table. I isolated the plate from the table and that fixed the probe LED flickering problem. Maybe this will help
    farmertom
    http://cncartwork.weebly.com/index.html

  4. #4
    Join Date
    Jan 2009
    Posts
    123
    I assume your "zero Plate" device has three terminals (Gnd, Vin and SigOut)? If so put the cap acrosss the gnd and input. This will reduce some noise entering from the power supply.

  5. #5
    Join Date
    Mar 2010
    Posts
    371
    He found and fixed his problem, but the cap is best placed as close to the input as possible, so at the BoB, not at the plate. Usually, for this kind of problem just a capacitor is all you need, but a series resistor may be needed in serious cases. You could also use a ferrite bead for some kinds of noise.

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