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unify electrical components are devices that convert optical signals into electrical signals. Their operating principle is based on the photoelectric effect. The photoelectric effect refers to the phenomenon where electrons in a material absorb photon energy when light strikes certain substances, resulting in corresponding electrical effects. Based on the different manifestations of the photoelectric effect, it is classified into three categories: external photoelectric effect, internal photoelectric effect, and photovoltaic effect. Photoelectric devices include phototubes, photomultiplier tubes, photoresistors, photodiodes, phototransistors, and photocells. The performance and characteristic curves of photoelectric devices are analyzed.

unify electrical component applications

SMD inductors are electromagnetic induction components made by winding insulated wire. They belong to commonly used inductor components. Function of SMD inductors: Passing DC and blocking AC is a simple description; they isolate and filter AC signals, or form resonant circuits with capacitors and resistors. Function of tuning and frequency selection inductors: An inductor coil connected in parallel with a capacitor can form an LC tuning circuit. Any current in the circuit through an SMD inductor generates a magnetic field, and the magnetic flux of this field acts on the circuit. When the current passing through the SMD inductor changes, the DC voltage potential generated in the SMD inductor opposes the change in current. When the current through the inductor coil increases, the self-induced electromotive force generated by the inductor coil is opposite to the direction of the current, opposing the increase in current, while converting part of the electrical energy into magnetic energy stored in the inductor; when the current through the inductor coil decreases, the self-induced electromotive force is in the same direction as the current, opposing the decrease in current, while releasing stored energy to compensate for the decrease in current. Therefore, after inductive filtering, not only are the ripples in load current and voltage reduced and the waveform smoothed, but the conduction angle of the rectifier diode also increases. Inductor function 1: Color-ring inductors have a current-blocking effect: The copper core in the color-ring inductor coil always resists changes in current within the coil. Color-ring inductors impede AC current used in circuits; the magnitude of this impedance is called inductive reactance XL, measured in ohms. Its relationship with inductance L and AC frequency f is XL=2πfL. Color-ring inductors are mainly divided into high-frequency choke coils and low-frequency choke coils. Inductor function 2: Color-ring inductors have tuning and frequency selection functions: A color-ring inductor connected in parallel with an electrolytic capacitor can form an LC tuning circuit. At resonance, the inductive reactance and capacitive reactance of the circuit are equal in magnitude but opposite in direction, meaning the natural oscillation frequency f0 of the circuit equals the frequency f of the non-AC signal, so the inductive reactance and capacitive reactance of the loop are also equal. The usage frequency of color-ring inductors is generally not very high, and color-ring inductors used in circuits are generally quite stable. Inductor function 7: The main uses of color-ring inductors include signal screening, noise filtering, current stabilization, and suppression of electromagnetic interference. The basic function of color-ring inductors is charging and discharging, but many circuit phenomena derived from this basic charging and discharging function give color-ring inductors various different applications. Today, color-ring inductors are widely used by customers, and the role played by these small inductors should not be underestimated.

unify electrical component applications

Basic circuits of 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, and 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 output and input signals in the former is usually linear; the output signal shape 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 (temperature, humidity, optical, piezoelectric, acoustic, etc.) are pre-processed 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.

unify electrical component classification

Classification by material: a, wire-wound resistors are made by winding resistance wire. They are manufactured by winding high-resistance alloy wire around an insulating core, coated with a heat-resistant glaze insulation layer or insulating varnish. Wire-wound resistors have a low temperature coefficient, high resistance accuracy, good stability, heat and corrosion resistance, and are mainly used as precision high-power resistors. Their disadvantages are poor high-frequency performance and a large time constant. b, carbon composition resistors are formed by pressing carbon and synthetic plastic. c, carbon film resistors are made by depositing a layer of carbon on a ceramic tube, specifically by depositing crystalline carbon onto a ceramic rod core. Carbon film resistors are low-cost, stable in performance, have a wide resistance range, and feature low temperature and voltage coefficients, making them the most widely used resistors at present. d, metal film resistors are made by depositing a layer of metal on a ceramic tube, using vacuum evaporation to deposit alloy material onto the surface of a ceramic rod core. Metal film resistors offer higher accuracy, better stability, lower noise, and a smaller temperature coefficient than carbon film resistors. They are extensively used in instruments and communication equipment. e, metal oxide film resistors are made by depositing a layer of tin oxide on a ceramic tube, forming a layer of metal oxide on an insulating rod. As they are oxides themselves, they are stable at high temperatures, resistant to thermal shock, and have strong load capacity. Classified by application, types include general-purpose, precision, high-frequency, high-voltage, high-resistance, high-power, and resistor networks.

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