The dynamic microphone principle is made by utilizing the phenomenon of electromagnetic induction.
Dynamic microphone:
When sound waves vibrate the diaphragm, the coil connected to the diaphragm vibrates together, and the voice coil vibrates in the magnetic field, which generates an induced current. The magnitude and direction of the induced current change, and the amplitude and frequency of the change are determined by the sound wave. , this signal current is amplified by the amplifier and then transmitted to the speaker, and the amplified sound is emitted from the speaker.
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Dynamic microphone Working principle:
When the microphone receives a sound wave, the force generated by the sound wave acts on the diaphragm, causing the diaphragm to vibrate, driving the voice coil to vibrate accordingly. The voice coil moves in the magnet, generating an electromotive force, and the sound signal is converted into an electrical signal.
Composition: The dynamic microphone is mainly composed of coil, magnet and shell.
Dynamic microphone Features:
solid structure, stable performance, durability, low price; good frequency characteristics, flat amplitude-frequency characteristic curve in the frequency range of 50-15000Hz; good directivity; no DC working voltage required, easy to use, low noise.
Advantages: Dynamic microphones are relatively simple in construction, so they are economical and durable. They can withstand extremely high sound pressures and are virtually unaffected by extremes of temperature or humidity.
Microphone classification:
Usually classified by the way it converts energy. Here we still follow the most common classification of microphones in recording studios, dividing microphones into dynamic microphones and condenser microphones.
Dynamic microphone
A microphone that generates an electrical signal from a conductor moving in a magnetic field. The diaphragm drives the coil to vibrate, thereby inducing a voltage in the coil in the magnetic field. Features: solid structure, stable performance, durability, low price; good frequency characteristics, flat amplitude-frequency characteristic curve in the frequency range of 50-15000Hz; good directivity; no DC working voltage required, easy to use, low noise.
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condenser microphone
The diaphragm of this type of microphone is an electrode of the capacitor. When the diaphragm vibrates, the distance between the diaphragm and the fixed rear plate changes, resulting in a variable capacitance. This variable capacitance is consistent with the capacitance of the microphone itself. The preamplifier together produces the signal voltage. Features: good frequency characteristics, flat amplitude-frequency characteristic curve in the audio range; no directionality; high sensitivity, low noise, soft tone; relatively large output signal level, low distortion, good transient response performance; working characteristics are not stable enough, The sensitivity of the low-frequency band decreases with the increase of use time, the lifespan is relatively short, and a DC power supply is required during operation, which makes it inconvenient to use.
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