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alre-it electrical components are energy conversion devices that convert sound signals into electrical signals. Categories include moving-coil, condenser, electret, and the recently emerging silicon microphones, as well as liquid microphones and laser microphones. Most microphones are electret condenser microphones, which operate using a polymer diaphragm with permanently isolated charge.

alre-it electrical components structure

Common dynamic cone paper loudspeakers. Dynamic cone loudspeakers were formerly commonly referred to as paper cone loudspeakers; although the diaphragm is still primarily paper cone, many polymer material diaphragms and metal diaphragms have also appeared, making the term cone loudspeaker appropriate. Cone paper loudspeakers generally consist of three main parts: the magnetic circuit system (permanent magnet, pole piece, magnetic plate), the vibration system (paper cone, voice coil), and the support auxiliary system (spider, basket, surround). 1. Voice coil: The voice coil is the drive unit of the cone paper loudspeaker. It is made of very fine copper wire wound in two layers on a paper tube, typically with dozens of turns, also known as a coil, and is placed in the magnetic gap formed by the magnetic pole piece and the magnetic plate. The voice coil is fixed to the paper cone; when an audio current signal is applied to the voice coil, the voice coil vibrates, driving the paper cone to vibrate. 2. Paper cone: There are many types of materials used for the conical diaphragm of cone paper loudspeakers, generally divided into two categories: natural fibers and synthetic fibers. Natural fibers often include cotton, wood, wool, and silk, while synthetic fibers include rayon, nylon, and fiberglass. Since the paper cone is the sound radiation element of the loudspeaker, it largely determines the acoustic performance of the loudspeaker. Therefore, regardless of the type of paper cone, it must be lightweight and have good rigidity, and must not deform due to changes in ambient temperature or humidity. 3. Surround: The surround is designed to ensure axial movement of the paper cone along the loudspeaker axis and restrict lateral movement, while also preventing air leakage between the front and rear of the paper cone. In addition to materials commonly used for paper cones, the surround may use plastics, natural rubber, etc., bonded to the paper cone via hot pressing. 13. Spider: The spider supports the junction of the voice coil and the paper cone, ensuring it remains vertical and not skewed. The spider has many concentric rings, allowing the voice coil to move freely up and down in the magnetic gap without lateral movement, ensuring the voice coil does not contact the magnetic plate. The dust cap on the spider prevents external dust from entering the magnetic gap, avoiding friction between dust and the voice coil, which could cause abnormal sounds from the loudspeaker. A typical loudspeaker consists of a magnet, frame, spider, molded surround, and cone paper cone.

alre-it electrical components structure

A thermopile is a pyroelectric infrared sensor, a device composed of thermocouples. It is widely used as a temperature detection device in fields such as ear thermometers, radiation thermometers, electric ovens, and food temperature detection. It is composed of two or more thermocouples connected in series, with the thermoelectric potentials output by each thermocouple superimposed on each other. Used to measure small temperature differences or average temperatures. Structure of a thermopile: The radiation receiving surface is divided into several sections, each connected to a thermocouple, and connecting them in series forms a thermopile. Depending on the application, practical thermopiles can be made in wire-wound and thin-film types, as well as multi-channel and array devices.

alre-it electrical components classification

Oscillators are mainly divided into RC, LC oscillators, and crystal oscillators. 1, RC oscillators use an RC network as the frequency-selective phase-shift network; such oscillators are collectively referred to as RC sine wave oscillators and belong to audio oscillators. 2, LC oscillators use an LC resonant circuit as the phase-shift and frequency-selective network; such positive feedback oscillators are called LC oscillators. 3, crystal oscillators are oscillators whose oscillation frequency is controlled by a quartz crystal. 6. Temperature coefficient oscillators refer to oscillators where there is a specific relationship between the oscillation frequency and temperature, meaning different temperatures correspond to different oscillation frequencies. Conversely, by measuring the output frequency of the oscillator, the temperature value can be determined.

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