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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


    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


    Jan 5, 2010
    Did you try what I suggested in your other thread?

  3. wopachop


    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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