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electronic noise reduction options

Discussion in 'General Electronics Discussion' started by wopachop, Oct 17, 2013.

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  1. wopachop

    wopachop

    47
    0
    Jul 22, 2012
    Hello everyone i have a voltage converter that is buzzing when used with a PWM dimmer. Im coming up short on trying to reduce the buzz. What about letting the sucker buzz away but instead just mask the sound?

    Does a type of spray foam designed for this purpose exist? Something that would stop sound waves but not trap too much heat?
     
  2. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    Did you try what I suggested in your other thread?

    Bob
     
  3. wopachop

    wopachop

    47
    0
    Jul 22, 2012
    I did a test with hot glue. Adding to different spots and finally had it completely covered over. It didnt help. I can change the sound by touching down on components.

    I did not try adding a small load like you said Bob. Will try that tonight for a test. What i dont like about that solution is it will slowly drain the battery power if a person was to leave their main switch on for a day or two.

    Was getting help from an engineer at Linear. He said i need to "use caps other than ceramic, such as aluminum electrolytic which are a bit bigger, but not piezoelectric in nature."

    Im still not sure if Ferrite rings are a good option. Tried to change the title in the other thread. Please feel free to combine them if you like. I had an idea of maybe putting the voltage regulator on a small heat sink, then completely cover it with a type of sound reducing foam. Either from a bottle or buy a sheet and wrap it around the regulator and tape it together.
     
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