SELEC electrical components Germany SELEC model SELEC price

SELEC electrical components are components of electronic components and small electrical machines and instruments. They themselves often consist of several parts and can be used interchangeably in similar products; they often refer to certain parts in the electrical, radio, and instrumentation industries. In fact, electronic components are the general term for components and devices.

SELEC electrical component characteristics

(1) A loudspeaker has two terminals (two leads). When a single loudspeaker is used, the two pins are not distinguished by positive or negative polarity. When multiple loudspeakers are used simultaneously, the two pins have polarity distinctions. (2) A loudspeaker has a paper cone, which is usually black in color, but also white. (3) Loudspeakers come in several major shapes, such as circular, square, and oval. (4) The back of the loudspeaker paper cone is a magnet. When a metal screwdriver touches the magnet of an external-magnet loudspeaker, the presence of magnetism can be felt; this sensation is not present in internal-magnet loudspeakers, but there is indeed a magnet inside the housing. (5) Loudspeakers are mounted on machine panels or inside speaker enclosures.

SELEC electrical component structure

Common electrodynamic cone paper-cone loudspeakers. Electrodynamic cone loudspeakers were formerly commonly referred to as paper-cone loudspeakers. Although the diaphragm is still mainly a paper cone, many polymer diaphragms and metal diaphragms have appeared, so the term cone loudspeaker is more accurate. A cone paper-cone loudspeaker generally consists of three main parts: the magnetic circuit system (permanent magnet, core pole, 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-cone loudspeaker. It is made of very fine copper wire wound in two layers on a paper tube, generally with dozens of turns, also known as a coil, and is placed in the magnetic gap formed by the magnetic core pole and the magnetic plate. The voice coil is fixed to the paper cone. When an audio current signal is passed through the voice coil, the vibration of the voice coil drives the vibration of the paper cone. 2. Paper cone: There are many types of materials used for the conical diaphragm of cone paper-cone 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 device of the loudspeaker, it largely determines the sound reproduction performance of the loudspeaker. Therefore, regardless of the type of paper cone, it is required to be both lightweight and rigid, and must not deform due to changes in ambient temperature and humidity. 3. Surround: The surround is set to ensure the axial movement of the paper cone along the loudspeaker axis and restrict lateral movement, while also blocking the flow of air between the front and back of the paper cone. In addition to the materials commonly used for paper cones, the surround material also uses plastics and natural rubber, which are thermally bonded to the paper cone. 5. Spider: The spider is used to support 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 that the voice coil does not touch the magnetic plate. The dust cap on the spider is designed to prevent external dust from falling into the magnetic gap, avoiding friction between dust and the voice coil, which would cause abnormal sounds from the loudspeaker. A typical loudspeaker consists of a magnet, frame, spider, molded surround, and cone paper cone.

SELEC electrical component applications

The basic circuits of analog integrated circuits include current sources, single-stage amplifiers, filters, feedback circuits, current mirror circuits, etc. Higher-level basic circuits composed of these include operational amplifiers and comparators. Even higher-level circuits include switched-capacitor circuits, phase-locked loops, and ADC/DAC. Based on the response relationship between output and input signals, analog integrated circuits can be divided into two major categories: linear integrated circuits and nonlinear integrated circuits. The response between the output and input signals of the former is usually linear; the shape of the output signal is similar to the input signal, only amplified by a fixed coefficient. In contrast, the response of the output signal to the input signal in nonlinear integrated circuits exhibits a nonlinear relationship, such as square or logarithmic relationships, hence they are called nonlinear circuits. Common nonlinear circuits include oscillators, timers, and phase-locked loop circuits. Typical applications of analog integrated circuits are shown in the figure below. External natural signals collected by various sensors or antennas, such as temperature, humidity, optical, piezoelectric, and acoustic sensors, are preprocessed by analog circuits and converted into suitable digital signals for input into digital systems. Signals processed by the digital system are then post-processed by analog circuits and converted into analog signals such as sound, images, and radio waves for output.

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