Microphones Flashcards
All 4 cards in this deck
What does a microphone convert sound waves into?
The pressure variations in sound waves are converted into variations in current (or potential difference) in a circuit.
Which effect does a moving-coil microphone use?
The generator effect (electromagnetic induction).
What are the steps by which a moving-coil microphone produces a current?
e.g. someone speaking into a microphone
- The pressure variations of the sound wave make the diaphragm vibrate.
- The diaphragm makes the attached coil vibrate near/over a magnet.
- The coil cutting the magnetic field induces an alternating current in the circuit.
True or false? A louder sound produces a larger current in a moving-coil microphone.
True. The diaphragm and coil move further and faster, so a larger potential difference is induced.