Send the link below via email or IMCopy
Present to your audienceStart remote presentation
- Invited audience members will follow you as you navigate and present
- People invited to a presentation do not need a Prezi account
- This link expires 10 minutes after you close the presentation
- A maximum of 30 users can follow your presentation
- Learn more about this feature in our knowledge base article
Making a Microphone
Transcript of Making a Microphone
Foundations of Physics Lab
Build a microphone and look at signal using an oscilloscope.
We were given some materials...
A plastic tube
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'...
It looked like we were picking up a signal...
But it wasn't coming from sound.
It started working!
We have a working 'microphone'!
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!
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!