Introduction of Condenser Microphone for Sound Level MeterDifferences in night vision goggles explained
Condenser microphones are the best microphones for recording, and their uses include solo vocals, saxophone, flute, pipe or woodwind instruments, acoustic guitar, or acoustic bass. Condenser microphones are suitable for any occasion where sound quality and clear sound are required. Due to their rugged construction and ability to handle high sound pressure, condenser microphones are an excellent choice for live sound reinforcement or live recording.
Another commonly used condenser microphone is called an electret microphone. The electret microphone has the characteristics of small size, wide frequency range, high fidelity and low cost. It has been widely used in electronic products such as communication equipment and household appliances. The diaphragm of the electret microphone has been subjected to high-voltage polarization treatment during production, and will permanently carry a certain charge, so no additional polarization voltage is required. For portability and other requirements, the electret condenser microphone can be made small, so it will affect the sound quality to a certain extent.
The principle of condenser microphone
The sound pickup principle of the condenser microphone is to use an extremely thin gold-plated film as one pole of the capacitor, and there is another fixed electrode separated from it by a few tenths of a millimeter, thus forming a capacitor of several P Farads. The film electrode follows the vibration of the sound wave. The capacity of the capacitor changes to form an electrical signal. Since this capacitor is only a few P farads (1 farad = 1000000000P farad), its internal resistance is extremely high, reaching the level of G ohms (1G ohm = 1000000000 ohm), so a circuit is needed to convert This gigaohm impedance translates to a common impedance of around 600 ohms. This circuit, also known as a pre-amplification circuit, is usually integrated inside the condenser microphone and requires a phantom power supply to power the circuit. We usually refer to the power supply required by condenser microphones as phantom power supply. Generally, there are 12V, 36V, 48V, etc., depending on the situation of the microphone. Because of the existence of this pre-amplification circuit, condenser microphones must be powered by phantom power to work normally. Condenser microphones + phantom power are generally very sensitive, much more sensitive than commonly used dynamic microphones. In other words, no matter whether the condenser microphone is used for recording on a computer or other equipment, phantom power is necessary, and the recorded sound will not be smaller than that of a dynamic microphone.
