The electrical symbol Daquan - - all incomplete to see

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Introduction: Electrical symbols are the representation methods of some electrical symbols . This paper systematically introduces the symbolic representations of diodes , triodes, FETs, resistors, capacitors and other common components. Is the electrical symbol incomplete?

First, the electrical symbol Daquan - - diode

A diode is a device with two electrodes that has the characteristics of "positive conduction, negative cutoff" and often performs rectification in the circuit. Can be divided into varactor diodes, bidirectional trigger diodes, Zener diodes, bridge rectifier diodes, Schottky diodes, photodiodes, LEDs, etc., the text symbol is D, the graphical symbols are as shown below:

diode:

Varactor diode:

Bidirectional trigger diode:

Zener diode (ZD):

Bridge rectifier diode:

Tunnel diode:

Schottky diodes:

Photodiode:

Light-emitting diodes (LEDs):

Two-color LED:

Second, the electrical symbol Daquan - - triode

A triode, also known as a bipolar transistor or a transistor, is a device with three electrodes that can be used for current amplification and is a core component of an electronic circuit. It can be divided into PNP type triode, NPN type triode, phototransistor, composite triode and so on. Its text symbol is Q/VT, and its graphic symbols are as shown below:

PNP type triode (Q/VT):

NPN type triode (Q/VT):

Phototransistor (Q/VT):

Composite triode:

Third, the electrical symbol Daquan - - FET

A field effect transistor, that is, a FET, which is also called a unipolar transistor, is a device having three electrodes like a triode, and belongs to a voltage control type semiconductor device. Can be divided into junction-type P-channel FET, junction-type N-channel FET, enhanced P-channel FET, enhanced N-channel FET, depletion P-channel FET, depletion N The channel FET, whose graphical symbols are as shown below:

Knot-type P-channel field effect transistor P-JEFT:

Knot N-channel FET N-JEFT:

Enhanced P-Channel FET P-MOS:

Enhanced N-Channel FET N-MOS:

Depletion P-channel FET P-MOS:

Depletion N-channel FET N-MOS:

Fourth, the electrical symbol Daquan - - resistance

Resistor is a common electronic component that can no longer be common. It is ubiquitous and exists in various circuits, indicating the magnitude of the conductor's resistance to current. Can be divided into resistors, potentiometers, thermistors, photoresistors, varistors, two-leg degaussing resistors, triangular degaussing resistors, etc., the text symbols and graphical symbols are shown below:

Resistance (R):

Potentiometer (VR/RP/W):

Triangle Degaussing Resistance (RT):

Two-leg degaussing resistance (RT):

Varistor (RZ/VAR):

Photosensitive resistor (CDS):

Thermistor (RT):

Five, electrical symbol Daquan - - capacitor

A capacitor is a device that has a charge-bearing power and is one of the components used in the circuit. Can be divided into polar capacitors, non-polar capacitors and adjustable capacitors, the text symbol is C, the graphical symbols are as shown below:

Have a polar capacitor:

Non-polar capacitor:

Adjustable capacitor:

Sixth, electrical symbols Daquan - - other

In addition to the diodes, transistors, FETs, resistors, and capacitors described above, couplers, operational amplifiers, crystal oscillators, fuses, relays, transformers, etc. are often present in the circuit. The graphical symbols are as follows:

Four-terminal optocoupler: