2006-12-19 22:14:47 · 6 answers · asked by siddharth_ram 2 in Science & Mathematics ➔ Physics
The microphone has 3 main parts-1Diaphragm 2.Coil called solenoid & 3.a permamnet circular magnet.
Arrangement:
The rim/boundary of the diaphragm fixed to the case of microphone.The coil is attached to the diaphragm in such a manner that long axis of coil is perpendicular and passes through the centre of diaphram.The coil is suspended into the magnetic field of the circular magnet.
Principle:When sound waves hit the diaphragm,they cause it to vibrate.Since the coil is fixed to it,the coil also vibrates.But since the coil is in the magnetic feild,a current is developed in the coil.*The current generated in th coil depends upon its movement in the field,which inturn depends on the sound!
For details on how current is developed,please refer "EMF generated in a conductor moving in electromagnetic feild"
Hope I have helped you out!
2006-12-19 22:39:33 · answer #1 · answered by Rohan 2 · 0⤊ 0⤋
Apart from the standard moving coil in a magnetic field, as described before, there are several other microphone designs.
Piezo-electrical microphones make use of a very special effect of some materials: when such materials are distorted somehow. They build up a small voltage, proportional to the amount of distortion, which can be measured. Those microphones are cheaper but not better.
Electret microphones are in fact variable capacitors, which change their properties by a vibrating conducting membrane.
(A capacitor can be seen as two conducting plates, which are close together but make no contact. Charges can build up between those plates, like if it were a short time battery.)
By constantly "measuring" the capacitance of such a microphone, you have the wanted electrical signal, which reflects the sound waves. Those belong to the finest microphones.
2006-12-20 08:18:02 · answer #2 · answered by Duliner 4 · 0⤊ 0⤋
I m not sure but i think that it is due to the phenomenon of magnetic induction. U must have noticed the small circular magnet and a circular copper coil in the microphone. When we speak anything, our sound vibrations causes vibrations in this coil and this coil starts vibrating in the magnetic field of that small magnet. Due to this relative motion between the coil and magnetic field, an emf gets induced in the coil and when the coil is shorted, a current starts flowing in the coil. Thus sound energy converts into electric energy.
2006-12-20 06:24:55 · answer #3 · answered by RISHABH 1 · 1⤊ 1⤋
the vibration made by the sound move a coil between a magnet, when a magnetic field lines are cut by a coil, electric current is produced which travel through wires.
2006-12-20 06:33:07 · answer #4 · answered by ray2_moot 2 · 1⤊ 0⤋
depends on the mic.
eg. dynamic is a moving coil attached to the diaphragm
For a full description, check out:
http://www.cassette2cd.co.uk/studio/microphones.htm
and:
http://www.cassette2cd.co.uk/studio/dynamic.htm
2006-12-23 20:19:24 · answer #5 · answered by ? 7 · 0⤊ 0⤋
by the power of JEE-ZUSS?
2006-12-20 06:19:09 · answer #6 · answered by Anonymous · 0⤊ 3⤋