Ribbon microphone
In ribbon microphone aluminium ribbon is used which acts as a diaphragm as well as coil when the ribbon is placed in magnetic field is made to move at right angle to the magnetic field by force of sound pressure there is change in magnetic flux through the ribbon conductor due to this change of magnetic flux and EMF is induced across the ribbon this EMF proportional to the rate of change of kinetic flux which is proportional to the force of sound waves striking the ribbon.
Q - Why ribbon microphone is velocity microphone ?
when the sound wave strike the ribbon and EMF is induced in it because induced EMF is proportional to velocity of ribbon it is also called velocity microphone.
Characteristics
* sensitivity is low .
* because of low mass of ribbon frequency response is very good almost flat about 20hz to 12khz.
* output impedance is very low less than < 0.5.
* distortion is less than 1%.
*signal is high about 50dB.
Applicatin
* suitable for broadcasting purpose .
* suitable for dram and theater.
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