lenco electrical components Germany lenco model lenco price

lenco electrical components refer to switching devices capable of closing, carrying, and breaking current under normal circuit conditions, and of closing, carrying, and breaking current under abnormal circuit conditions within a specified time. Circuit breakers are classified into high-voltage and low-voltage types according to their scope of application. The boundary between high and low voltage is relatively vague; generally, equipment rated above 3kV is referred to as high-voltage apparatus. Circuit breakers can be used to distribute electrical energy, start asynchronous motors infrequently, and protect power lines and motors. They can automatically cut off the circuit in the event of severe faults such as overload, short circuit, or undervoltage. Their function is equivalent to a combination of fuse-switches and thermal over/under-voltage relays. Moreover, component replacement is generally not required after interrupting fault currents. They have been widely applied. In the generation, transmission, and use of electricity, power distribution is an extremely important link. The distribution system includes transformers and various high- and low-voltage electrical equipment, with low-voltage circuit breakers being a type of electrical apparatus with extensive usage.

lenco electrical component classification

Printed circuit boards are broadly classified into single-sided, double-sided, and multilayer boards based on the number of layers. First, single-sided boards: on the most basic PCB, components are concentrated on one side, while conductive traces are concentrated on the other. Since traces appear on only one side, this type of PCB is called a single-sided printed circuit board. Single-sided boards are typically simple to manufacture and low in cost, but their disadvantage is that they cannot be applied to overly complex products. Double-sided boards are an extension of single-sided boards; when single-layer routing cannot meet the needs of electronic products, double-sided boards are used. Both sides have copper cladding and traces, and vias are used to connect circuits between the two layers, forming the required network connections. Multilayer boards refer to printed boards formed by laminating more than three layers of conductive graphic layers separated by insulating materials, with interconnections between the conductive graphics made as required. Multilayer printed circuit boards are the product of the development of electronic information technology towards high speed, multi-functionality, large capacity, small volume, thin profile, and light weight. Based on characteristics, circuit boards are classified into flexible boards (FPC), rigid boards (PCB), and rigid-flex boards (FPCB).

lenco electrical component features

1. The function of a varactor diode is based on the principle that the capacitance of the PN junction is variable. It is a semiconductor device used as a variable capacitor in high-frequency tuning, communication, and other circuits. Varactor diodes belong to the category of reverse-biased diodes; changing the reverse bias voltage on the PN junction changes the PN junction capacitance. The higher the reverse bias voltage, the lower the junction capacitance. The relationship between reverse bias voltage and junction capacitance is nonlinear. 12. Diagram of the relationship between varactor diode capacitance and reverse bias voltage: (a) Increased reverse bias causes decreased capacitance; (b) Decreased reverse bias causes increased capacitance. The capacitance tolerance range defines the specified capacitance range of a varactor diode. Datasheets will display minimum, nominal, and maximum values, which are often plotted on graphs.

lenco electrical component structure

Common electrodynamic cone paper loudspeakers. Electrodynamic cone loudspeakers, formerly known as paper cone loudspeakers, still primarily use paper cones for the diaphragm, but many polymer material diaphragms and metal diaphragms have also emerged, making the term cone loudspeaker more accurate. Cone paper loudspeakers mainly consist of three 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 consists of very fine copper wire wound in two layers around a paper tube, typically with dozens of turns, also known as a coil. It 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 passes 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 loudspeakers, generally divided into natural fibers and synthetic fibers. Natural fibers often include cotton, wood, wool, and silk, while synthetic fibers include rayon, nylon, and fiberglass. As the paper cone is the sound-radiating element of the loudspeaker, it largely determines the acoustic performance. Therefore, regardless of the type, the paper cone 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 back of the paper cone. In addition to materials commonly used for paper cones, surrounds 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 touch 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 in the loudspeaker. Generally, a loudspeaker consists of a magnet, frame, spider, molded surround, and cone paper diaphragm.

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