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Making a Microphone

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by

Chiara Notaro

on 18 May 2018

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Transcript of Making a Microphone

Making a Microphone
Foundations of Physics Lab
Aim
Build a microphone and look at signal using an oscilloscope.
We were given some materials...
A plastic tube
Plastic/cling wrap

Copper wire

Magnets
Oscilloscope with appropriate wires
In short, we must somehow convert sound (waves) into a current where changes in voltage can be measured!
Figuring out the components...
Diaphragm: Plastic wrap

Tension: Stretched over tube
Copper wire: make a coil
Magnets: magnetic field
Oscilloscope: measure changes in Voltage
Sound -> Movement -> Current
Putting it all together!
How do microphones work?
Almost like a 'backwards speaker'...
Preliminary Results
It looked like we were picking up a signal...
But it wasn't coming from sound.
It started working!
What happened?
We have a working 'microphone'!
But why...
A still magnet produces no current - it must move!

In our case, done by the sound waves moving the diaphragm.
How many magnetic field lines are passing through this given area?
"A difference in potential that gives rise to an electric current"
I don't like changing magnetic fields!
Coil
I'll make a current to have a magnetic field that opposes it!
How could we improve and what are future studies?
Thank you for your attention!
Full transcript