At the beginning of the 20th century, wired microphones developed from initial resistance-converted acoustics to inductive, capacitive conversion, and a number of new microphone technologies developed, including microphones such as aluminum drive rings, as well as capacitive microphones and polar microphones, which are currently widely used. The ring microphone works by making the shock film vibrate by human sound through the air, and then the electromagnetic coil windings on the ring film and the magnets surrounding the ring wheat head form a magnetic field cutting, forming a weak fluctuation current. The current is transmitted to the amplifier and the fluctuating current is turned into sound in the opposite process.
Aluminium with microphone
For aluminum tape microphones, the aluminum tape used is both a microphone diaphragm and a conductor that movements in a magnetic field. The aluminum belt is usually made of aluminum, 0 to 1 mm thick, 2 mm to 4 mm wide, and only 0.2 mg in mass, in order to achieve a better transient reaction. In order to achieve an ideal resonance frequency between 2kHz and 4kHz, the aluminum band is made of crease to maintain a precise stress value. The aluminum belt is suspended as a conductor and microphone diaphragm in a magnetic field between the two magnetic poles, vibrating with the frequency of incoming sound waves, while generating a voltage output at both ends of the aluminum belt.
The capacitive microphone has two metal plates, one of which is coated with a polar film (mostly polypluoroethylene) and grounded, and the other pole is connected to the gate of the field effect transistor, with a diode between the gate and the source pole. When the polar diaphragm itself has an electric charge, the surface charge ground charge is Q, the geoelectrelectrelectral capacity between the plates is C, the ground voltage U-Q/C is generated on the pole head, when subjected to vibration or airflow friction, due to vibration caused by the poles The distance between the plates changes, that is, capacitor C changes, and the battery Q does not change, will cause voltage changes, the size of voltage changes, reflecting the strength of external sound pressure, this voltage change frequency reflects the frequency of external sound, which is the pole-based sound transmitter working principle.
Capacitive microphone diaphragm mostly uses polypluoroethylene, its humidity performance is good, the resulting surface charge is large, affected by humidity is small. Since this transmitter is also a capacitive structure with a large internal resistance, the field-effect transistor must also be used at the output in order to draw out and amplify the voltage signal generated by the sound.
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