www.pratheepvasudev.blogspot.in
www.pratheepvasudev.blogspot.in
www.pratheepvasudev.blogspot.in
www.pratheepbizmentor.blogspot.in
Carbon microphone
[Film Technology]
Other name
of resistance microphone. The simplest type of modern microphone is the carbon microphone, used in telephones. This microphone consists
of a metallic cup filled with carbon granules; a movable metallic diaphragm mounted in contact with the granules covers the open end of the
cup. Wires attached to the cup and diaphragm are connected to an electrical circuit so that a current flows
through the carbon
granules. Sound waves vibrate the diaphragm, varying the pressure
on the carbon granules. The electrical resistance of the carbon granules
changes with the varying pressure, causing the current in the circuit to change
according to the vibrations of the diaphragm. The varying current may either
actuate a nearby telephone receiver or may be amplified and transmitted to a
distant receiver. If the current variation is suitably amplified, it may also
be used to modulate a radio transmitter.
No comments:
Post a Comment