What are the common electronic components in electronic engineering

Do you know what electronic components are commonly used in electronic engineering? Today, let xiaobian introduce some for you.

One, resistor

Resistance can be said to be the most commonly used electronic components in circuit engineering, represented by R, to represent the blocking effect of conductor on current. The main functions in the circuit are shunt, current limit, partial voltage, bias and so on.

Parameter identification of resistance: commonly used is color code, value code and number code method.

Commonly used is the color code method, with four color rings of which the first and second ring respectively represent the first two digits of resistance; The third ring represents multiplication; The fourth ring represents the error. For example, if the four color rings are yellow, orange, red, and gold, and the third ring is red, the resistance range is in the order of k ω, the yellow and orange colors represent the numbers "4" and "3," and the reading is 4.3 K ω.

Ii. Capacitor

Capacitance is used to store charge and electric energy in the circuit, denoted by C. The main characteristic of capacitance is to pass ac and isolate DC. Capacitance's obstacle to AC is called capacitive reactance, which is one kind of reactance (there is another kind called inductive reactance). The main functions of capacitor in circuit are: coupling, filtering, resonance, bypass, compensation, frequency division and so on.

Capacitors are also represented by direct marking, text and symbol grouping, and color coding.

The model number consists of four parts, which of course do not apply to pressure-sensitive, variable, and vacuum capacitors, representing name, material, category, and serial number respectively.

The classification of capacitors is relatively complicated. According to the current statistical analysis, there are 10 classification methods. For details, please refer to the device manual.

What are the common electronic components in electronic engineeringThree, crystal diode

Crystal diode is a semiconductor device, with nonlinear voltammetric characteristics, denoted by D, the main function is unidirectional conductivity. The core part is a PN junction, widely used in various electronic circuits. Its type is many, according to the material has silicon tube and germanium tube points; According to the function, there are rectifier, light, detection, voltage regulator, switch, continuous current, rotation, Schottky diode and silicon power diode. According to the structure of contact type and plane type, the former can pass through small current, the latter through large current.

The main parameters of the diode are maximum rectification current IF, maximum reverse operating voltage, reverse current, dynamic resistance, maximum operating frequency, voltage temperature coefficient and so on.

The positive and negative terminals of the diode, the positive end A is called the anode, and the negative end K is called the cathode, and the current can only move from the anode to the cathode. Many beginners speak diode and semiconductor confused, in fact, diode and semiconductor are completely different, can only say that diode is a semiconductor device.

Diode identification problem: small power diode N pole (negative pole), in the diode appearance mostly with a color circle marked out, some diodes also use diode special symbols to represent P pole (positive pole) or N pole (negative pole), there are symbols for "P", "N" to determine the polarity of the diode. The positive and negative poles of leds can be identified by the length of the pins, with long pins being positive and short pins being negative. When using a digital multimeter to measure the diode, the red pen is connected to the positive pole of the diode, and the black pen is connected to the negative pole of the diode. At this time, the resistance measured is the positive guide resistance value of the diode, which is opposite to the pointer type multimeter.

Four, inductor

A device that converts electrical energy into magnetic energy and stores it in a structure similar to that of a transformer. Inductor, also known as choke, reactor, and dynamic reactor, is represented by L.

Classification: according to the induction mode there are self induction and mutual induction. Small inductors can be etched directly onto the PCB board using a method of laying spiral tracks. Low-value inductors can also be manufactured in integrated circuits using the same process used to make transistors. Either way, the most widely used circuit based on practical constraints is called a "rotator", which uses a capacitor and an active element to exhibit the same properties as an inductor.

The inductor and capacitor characteristics are just the opposite, it has to prevent the ac through and let the direct current through the characteristics, called on direct resistance.

Inductors are mainly used to filter, oscillate, delay, notch, screen signal, filter noise, stabilize current, suppress electromagnetic interference and so on. The most common function is to form an LC filter in conjunction with a capacitor.

The main parameters of inductance include inductance, allowable error, quality factor and distributed capacitance.

Five, crystal triode

Triode, full name should be semiconductor triode, also known as bipolar transistor, crystal triode, is a kind of control current semiconductor device, is the core element of electronic circuit.

Triode is a semiconductor substrate on the production of two very close to the PN junction, two PN junction to the whole semiconductor into three parts, the middle part is the base area, the two sides of the emitting area and collecting area, arranged in PNP and NPN two.

The essence of the triode is that it can control the large change of collector current with the small change of base current. This is the most basic and important characteristic of the triode. The ratio of δ Ic/ δ Ib is called the current magnification of the crystal triode, which is indicated by the symbol "β". The current magnification factor is a constant value for a triode, but it will also change with the change of the base current when the triode is working.

The main parameters include characteristic frequency FT, voltage and current, amplification, saturation voltage, dissipated power and so on.

Triode can work in cutoff, amplification and on three states. Triode is most commonly used to form the amplifier circuit, the basic amplifier circuit is the most basic structure of the amplifier circuit, is the basic unit of complex amplifier circuit. It uses the characteristics of bipolar semiconductor triode input current control output current, or the field effect semiconductor triode input voltage control output current, signal amplification. In amplification, it is necessary to have a proper bias, that is, the emitter junction is positive bias, the collector junction is negative bias. The input loop should be set so that the input signal is coupled to the input electrode of the triode, forming a changing base current, thus producing the current control relation of the triode, which becomes the change of the collector current. The setting of the output loop should ensure that the current signal amplified by the triode is converted into the form of power required by the load.

So the above is the introduction of electronic components commonly used in electronic engineering, the above five electronic components commonly used in electronic engineering.

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