The apparatus affixed to the radio which converts sound waves to electrical impulses
an electromechanical transducer that converts sound pressure into an electrical signal Condenser mics require power to charge a capacitor used to sense changes in sound pressure levels (SPL)
is an input device that captures live sounds such as your voice or perhaps a dog barking
It produces its effects by the changes of intensity in an electric current, occasioned by the variations in the contact resistance of conducting bodies, especially of imperfect conductors, under the action of acoustic vibrations