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Hands-On-Physics
WAVES
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Messing
Around
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- Seeing Sound -
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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.
- Gather and identify
parts
for the amplifier. You will need a "
breadboard"
for assembling these electronic components into a circuit.
- Assemble the amplifier circuit and attach the microphone. Follow the
circuit diagram, using
the drawing of the circuit
and the picture of the circuit
as guides.
- Test your new apparatus by attaching it to an oscilloscope. Speaking
into the microphone should make patterns on the "scope".
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