Feedback
From UO Physics Demonstration Catalog
Return to Sound
Description:
An audio feedback loop is setup between the 8ohm speaker and the carbon element microphone in this configuration. The mode of oscillation is determined by the size of the container, and to some degree, the orientation of the microphone. To get the lower order modes it is best to hold the microphone with the element horizontal or slightly up. It also helps to hold the container from 3 to 6 inches above the speaker.
Location:
