- Seeing Sound -

Microphones convert sound waves into electrical signals. If these weak electrical signals are magnified with an electronic amplifier, they can be observed with an oscilloscope.

Oscilloscopes are very common electronic tools. They display rapidly oscillating voltages in an understandable way. Oscilloscopes graph voltage on the vertical axis vs. time on the horizontal axis, making a two-dimensional picture of the changing voltage.

Build an amplifier with a microphone for converting sounds to voltages. You will use this "amp" to investigate sounds in Messing Around activity #3.

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