GRAS electrical components German GRAS models GRAS prices

GRAS electrical components include circuit boards such as: ceramic circuit boards, alumina ceramic circuit boards, aluminum nitride ceramic circuit boards, printed wiring boards, PCB boards, aluminum substrate boards, high-frequency boards, thick copper boards, impedance-controlled boards, PCB, ultra-thin printed wiring boards, ultra-thin circuit boards, and printed (copper etching technology) circuit boards. Circuit boards miniaturize and visualize circuits, playing a crucial role in the mass production of fixed circuits and optimizing appliance layouts. Circuit boards are also known as printed wiring boards or printed circuit boards. Flexible printed wiring boards and flexible circuit boards are highly reliable, highly flexible printed circuit boards made using polyimide or polyester film as the base material. They feature high wiring density, light weight, thin profile, and good bendability.) and rigid-flex boards—the emergence and development of FPC and PCB have spurred the creation of rigid-flex boards as a new product. Therefore, rigid-flex boards are circuit boards formed by combining flexible printed wiring boards and rigid printed wiring boards through lamination and other processes according to relevant process requirements, resulting in boards with both FPC characteristics and PCB characteristics.

GRAS electrical component applications

Basic circuits in analog integrated circuits include current sources, single-stage amplifiers, filters, feedback circuits, and current mirror circuits. 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 main categories: linear integrated circuits and nonlinear integrated circuits. The former typically exhibits a linear response between output and input signals; the output signal shape is similar to the input signal, only amplified by a fixed coefficient. In contrast, the output signal of nonlinear integrated circuits exhibits a nonlinear response to the input signal, such as square-law or logarithmic relationships, hence the term 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 outputs such as sound, images, and radio waves.

GRAS electrical component principles

NPN type bipolar transistors can be viewed as two diodes connected together with a common anode. During normal operation of a bipolar transistor, the base-emitter junction is forward-biased, while the base-collector junction is reverse-biased. Without external voltage, the electron concentration in the N region of the emitter junction is greater than that in the P region, causing some electrons to diffuse into the P region. Similarly, some holes from the P region will diffuse into the N region. This forms a space charge region at the emitter junction, generating an internal electric field directed from the N region toward the P region. This field hinders further diffusion, achieving dynamic equilibrium. When a forward voltage is applied to the emitter junction, the dynamic balance between carrier diffusion and the internal electric field in the depletion layer is broken, injecting thermally excited electrons into the base region. In NPN type transistors, the base region is P type doped, where holes are the majority carriers; thus, electrons in this region are called "minority carriers." Electrons injected from the emitter into the base region partly recombine with the majority carriers (holes). However, due to the low doping level and thin physical dimensions of the base region, and because the collector junction is reverse-biased, most electrons reach the collector region via drift motion, forming the collector current. To minimize recombination before electrons reach the collector junction, the base region must be manufactured sufficiently thin so that the carrier diffusion time is shorter than the semiconductor minority carrier lifetime, and the base thickness must be much smaller than the electron diffusion length. In modern bipolar transistors, the typical base region thickness is a few tenths of a micrometer. Note that although both the collector and emitter are N type doped, their doping levels and physical properties differ; therefore, a bipolar transistor must be distinguished from two diodes connected in series in opposite directions.

GRAS electrical component functions

Multimeters can measure not only the resistance of objects but also AC and DC voltages, including DC voltage. Some multimeters can even measure key transistor parameters and capacitor capacitance. Proficient use of multimeters is one of the most basic skills in electronic technology. Common multimeters include analog (pointer-type) multimeters and digital multimeters. Analog multimeters are multifunctional measuring instruments centered around a meter movement, with measurements read from the pointer position. Digital multimeters display measurements directly as numbers on an LCD screen, making them easy to read; some also feature voice prompts. A multimeter is an instrument that integrates a voltmeter, ammeter, and ohmmeter using a single meter movement. The DC current range of a multimeter is essentially a multi-range DC ammeter. Connecting shunt resistors in parallel with the meter movement expands its current range. The DC voltage range of a multimeter is a multi-range DC voltmeter. Connecting divider resistors in series with the meter movement expands its voltage range. Different divider resistors correspond to different ranges. The meter movement in a multimeter is a magnetoelectric mechanism that only passes DC current; diodes are used to convert AC to DC, enabling AC measurement.

Weidou Intelligent Technology specializes in selling German GRAS connectors, GRAS switches, GRAS relays, GRAS controllers, GRAS plugs, GRAS sensors, GRAS resistors, GRAS capacitors, GRAS buses, GRAS modules, GRAS cables, GRAS power supplies, GRAS interfaces, GRAS gateways, and GRAS circuit breakers. GRAS products are original imports from Germany. Customers are welcome to inquire and place orders.