Electronics Elements

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Monday, October 23, 2017

Electrical & Electronic Circuit Symbols

Electrical symbols or electronic circuits are virtually represented by circuit diagrams. There are some standard symbols to represent the components in a circuits. This article gives some of the frequently used symbols for drawing the circuits. There are many electrical and electronic schematic symbols are used to signify basic electronic or electrical device. These are mostly we used for draw circuit diagrams.


Below are different kind of symbols we mentioned category wise. Hope this information will helps to understand clearly.

Wires, Switches, Sources, Ground, Resistor, Variable Resistor, Capacitor, Inductors, Diodes, Transistor, Logic Gates, Amplifiers, Antenna, Transformer, Miscellaneous.

Electrical Symbols & Electronic Symbols

WIRES

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Wires


Represents a conductor that conducts electrical current. Also called a power line or electric line or wire.
Connected Wires


Represents the connection of two conductors. Dot shows the junction point.
Unconnected Wires


Represents two unconnected wires/conductors.

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Input Bus Line


Represents a bus for input or incoming data.
Output Bus Line


Represents a bus for output or outgoing data.
Terminal


Represents start or end point.

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 Bus Line


Represents a number of conductors joined together to form a bus wire. -----------------------------------------------------------------------------------------------------------------------------

SWITCHES

Push Button (Normally Open)


This switch is in ON state when the button is pressed otherwise it is in OFF state.
Push Button (Normally Closed)


This switch is initially in ON state. This goes to OFF state when it is released.
Spst Switch


Single pole single throw is abbreviated as SPST. This acts as ON/OFF switch. Poles define the number of circuits it can be connected to and throws defines the number of positions that a pole connects.
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Spdt Switch


Single pole double throw is abbreviated as SPDT. This switch allows the current to flow in any one of the two directions by adjusting its position.
Dpst Switch


Double pole single throw is abbreviated as DPST. This switch can drive two circuits at a time.
Dpdt Switch

Double pole double throw is the full form of DPDT. This can connect the four circuits by changing the position.

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Relay Switch


This represents the relay switch. This can control the AC Loads using the DC voltage applied to the coil.

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SOURCES
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AC Supply


This represents AC supply in the circuit.
           DC Supply


This represents the DC power supply. It applies DC supply to the circuit.
Constant Current Source


The symbol represents an independent current source which delivers constant current.

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Controlled current Source


It is a dependent current source. Usually depends on other sources (voltage or current).
Controlled Voltage Source


It is a dependent voltage source. Usually depends on other sources (voltage or current).
Single Cell Battery


This provides supply to the circuit.

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 Multi Cell Battery


Combination of multiple single cell batteries or a single large cell battery. The voltage is usually higher.



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 Wave Generators
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Sinusoidal Generator


Represents sine wave generator.
Pulse Generator


Represents pulse or square wave generator.
Triangular Wave


Represents triangular wave generator.

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GROUND SYMBOLS  ----------------------------------------------------------------------------------------------------------------------------

Ground


It is equivalent to theoretical 0V and is used as zero potential reference. It is the potential of perfectly conducting earth.
Signal Ground


It is a reference point from which the signal is measured. There may be several signal grounds in a circuit due to the voltage drops in a circuit.
Chassis Ground


It acts as a barrier between user and the circuit and prevents electric shock.
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 RESISTOR SYMBOLS
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 Fixed Resistor


It is a device that opposes the flow of current in a circuit. These two symbols are used to represent fixed resistor.


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 VARIABLE RESISTOR
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Rheostat


It is a two terminal variable resistor. They are generally used to control the current in the circuit. Generally used in tuning circuits and power control applications like heaters, ovens etc
Preset


It is a mini variable resistor. It is also called Trimmer Resistor or Trim Pot. The resistance is adjusted with rotary control present on top of it with the help of a screw driver. They are used to adjust the sensitivity of the circuit like temperature or light.
Thermistor


It is a temperature sensitive resistor. They are used in temperature sensing, current limiting circuits, over-current protection circuits etc.

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Varistor


It is a Voltage Dependent Resistor. It has non-linear current-voltage characteristics. Generally used in circuit protection from voltage surges and excessive transient voltages.
Magneto Resistor


They are also called as Magnetic Dependent Resistors (MDR). The resistance of magneto resistor varies according to the external magnetic field strength. They are used in electronic compass, ferrous material detection, position sensors etc.
LDR


They are also called as Photo Resistors. The resistance of LDR varies with the intensity of the light incident on it. They are generally used in light sensing applications.
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Tapped resistor


A wire-wound type fixed resistor with one or more terminals along its length. Generally used in voltage divider applications.
Attenuator


It is a device used to lower the power of a signal. They are made from simple voltage dividers and hence can be classified in the family of the resistors.
Memristor


The resistance of memristor is varied according to the direction of flow of charge. Memristors can be used in signal processing, logic/computation, non-volatile memory etc.

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 CAPACITOR SYMBOLS
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Non Polarized Capacitor


Capacitor stores the charge in the form of electrical energy. These two symbols are used for non-polarized capacitor. Non-polarized capacitors are big in size with small capacitance. They can be used in both AC and DC circuits.
Polarized Capacitor


Polarized capacitors are small in size but have high capacitance. They are used in DC circuits. They can be used as filters, for bypassing or passing low frequency signals.
Electrolytic Capacitor


Almost all electrolytic capacitors are polarized and hence used in DC circuits

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Feed through Capacitor


They provide low impedance path to ground for high frequency signalsVariable Capacitor. Variable Capacitor

The capacitance of the variable capacitor can be adjusted by turning the knob. They are widely used to adjust the frequency , that is for tuning.

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INDUCTORS 
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Iron Core Inductor


These are used as substitutes to ferrite core inductors. Ferrite core or Ferromagnetic inductors have high permeability and require air gap to reduce it. Iron powdered core inductors have this air gap integrated.
Ferrite Core Inductors


Core material, in this type of inductors is made of ferrite material. These are mostly used to suppress the interference of electromagnetic waves.
Center Tapped Inductors


These are used in coupling of signals,

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Variable Inductors


Movable ferrite magnetic core variable inductors are most common. The inductance is varied by sliding the core in or out of the coil. 

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 DIODES
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Pn Junction Diode


A PN junction diode allows the current to flow only in forward bias condition. These diodes can be used in clipping and clamping circuits , as rectifiers in dc circuits etc.
Zener Diode


In forward bias condition, it acts as normal diode and allows current. It also allows current to flow in reverse bias condition when the voltage reaches a certain break-down point. Generally used in voltage regulator and over voltage protection circuits.
Photodiode


Photodiode detects the light energy and converts it into current or voltage by a mechanism called photoelectric effect. These are used in CD players , Cameras etc.
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Led


Light emitting diode is similar to PN junction diode but they emit energy in the form of light instead of heat. These are mostly used in indication , lightening applications.
Varactor Diode


Varactor diode is called varicap or variable capacitance diode. The capacitance of this diode varies according to the applied input voltage. This is used in frequency controlled oscillators , frequency multipliers etc.
Shockley Diode


This is a four layer diode. This had fast switching operation and hence is used in switching applications.

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Schottky Diode


It represents Schottky diode. It has low forward voltage drop and it can switch rapidly. Used in voltage clamping, rectifiers, reverse current and discharge protection
Tunnel Diode


This is also known as Esaki diode.It can switch very fastly and can perform well in micro wave frequency range. This is used in oscillator circuits and micro wave circuits.
Thyristor


It consists of four layers of alternating P and N materials. They act as bistable switches and are used in circuits where high voltages and currents are involved.

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