Difference between revisions of "Feedback"

From UO Physics Demonstration Catalog

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A plastic cub with an attached grooved plastic string. When you run your fingernail along the grooves, the cup says, "Have a nice day."
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.


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Revision as of 12:28, 14 April 2022

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: