In this session we introduced the boys to alternating current (AC). The first AC signals we looked at were generated by my "guitar string," a wire that was strung over a strong permanent magnet. As the wire is plucked, it generated a voltage which could be observed on the O'Scope. Then the boys learned that an old speaker from a radio can not only move air so we can hear the AC signals, but it can generate fast AC signals from high pitched voices and slower signals from the base voices. Timmy is singing into the speaker and looking at his own voice on the O'scope.
Friday, February 18, 2011
Speak into the speaker!
In this session we introduced the boys to alternating current (AC). The first AC signals we looked at were generated by my "guitar string," a wire that was strung over a strong permanent magnet. As the wire is plucked, it generated a voltage which could be observed on the O'Scope. Then the boys learned that an old speaker from a radio can not only move air so we can hear the AC signals, but it can generate fast AC signals from high pitched voices and slower signals from the base voices. Timmy is singing into the speaker and looking at his own voice on the O'scope.
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What fun! I remember Dad doing the same thing with an oscilloscope with me as a boy.
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