Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Single phase

  1. Aug 28, 2009 #1
    Signal phase

    To cancel out 60 hz from my signal source(dynamic mic) I need to use an instrumention amp with another 60 hz source. How would I make the generated 60 hz have the same phase as the noise 60 hz?? and also do both signals have to be the same amplitude for this to work well?
    Last edited: Aug 28, 2009
  2. jcsd
  3. Aug 28, 2009 #2
    You have to be 180 degrees out of phase to cancel out the waves.
  4. Aug 28, 2009 #3
    It is usually easier to find the source of the 60 Hz hum and eliminate it than to match both the amplitude and phase of the 60 Hz to cancel it out. Look for grounds and shielding, and ground currents (ground loops) in cable shields.
  5. Aug 31, 2009 #4
    Could you use notch filter for this?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook