Fun & Games Science
HOW TO – Eliminate Hum or Buzz

SpeakerTips for getting rid of the annoying hum – “Of all the annoyances that can afflict any audio/video home theater or even a simple stereo installation, the notorious “ground loop” may well be the most difficult and persistent one to track down and eliminate. A “ground loop” is caused by the difference in electrical potential at different grounding points in an audio/video system. (All the grounds in an A/V system should ideally be at “0” potential.) A ground loop typically adds a loud low-frequency hum or buzz as soon as you plug in any of various audio or video components, including subwoofers, cable-TV outboard boxes, satellite-TV feeds, TV displays, amplifiers, A/V receivers or turntables. The buzz/hum is a byproduct of the multiple power supply cables and a ground voltage differential within your system and its network of interconnecting cables.” Link.

0 thoughts on “HOW TO – Eliminate Hum or Buzz

  1. But you didn’t actually say how it works, software side. It’s nice to know there’s a photodiode on the gun, but how does it “sense” where on the screen it is?


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