What is Mains hum?
{{Orphan|date=May 2009}} '''Mains hum''' is a [[Signal (electrical engineering)|signal]] at a [[nominal]] 50 or 60&nbsp;[[Hertz|Hz]], depending on local [[alternating current]] frequency, and usually some [[harmonic]] content. The changing [[magnetic flux]] caused by the mains current links with the [[windings]] of the [[Pickup (music)|pickup]], [[Induction|inducing]] a [[voltage]] by [[transformer]] action. {{science-stub}} [[Category:Sound]]