symbols in edc lab

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WIRES AND CONNECTIONS

Electronic

Component

Circuit Symbol Description

Wire

Wire Circuit Symbol

Used to connect one component to another.

Wires Joined

Wires Joined Circuit Symbol

One device may be connected to another

through wires. This is represented by drawing

blobs on the point where they are shorted.

Unjoined Wires

Wires Not Joined Circuit Symbol

When circuits are drawn some wires may not

touch others. This can only be shown bybridging them or by drawing them without

blobs. But bridging is commonly practised as

there will not arise any confusion.

Power Supplies

Electronic

Component

Circuit Symbol Description

Cell

Cell Circuit Symbol

Used to provide a supply for a circuit.

Battery

Battery Circuit Symbol

A battery has more than a cell and is used for

the same purpose. The smaller terminal is

negative and the larger one is positive.

Abbreviated as B.

DC Supply

DC Supply Circuit Symbol

Used as a DC power supply, that is, the current

will always flow in one direction.

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AC Supply

AC Supply Circuit Symbol

Used as AC power supply, that is, the current

will keep alternating directions.

Fuse

Fuse Circuit Symbol

Used in circuits where a probability ofexcessive current flows. The fuse will break the

circuit if excessive current flows and saves the

other devices from damage.

Transformer

Transformer Circuit Symbol

Used as an ac power supply. Consists of two

coils, the primary and secondary that are

linked together through an iron core. There is

no physical connection between the two coils.

The principle of mutual inductance is used to

obtain power. Abbreviated as T.

Earth/Ground

Earth Circuit Symbol

Used in electronic circuits to represent the 0

volts of the power supply. It can also be

defined as the real earth , when it is applied in

radio circuits and power circuits.

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Capacitor

Electronic

Component

Circuit Symbol Description

Capacitor

Capacitor Circuit Symbol

Capacitoris a device that is used to store

electrical energy. It consists of two metals

plates that are separated by a dielectric. It is

applicable as a filter, that is, to block DC signals

and allow AC signals. Abbreviated with the

letter C.

Capacitor -

Polarized

Capacitor-Polarised Circuit Symbol

Capacitor can be used in a timer circuit by

adding a resistor.

VariableCapacitor

Variable Capacitor Circuit Symbol

Used to vary the capacitance by turning theknob. A type of variable capacitor is the

trimmer capacitor that is small in size. The

notations are all the same.

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Diode

Electronic

Component

Circuit Symbol Description

Diode

Diode Circuit Symbol

A diode is used to allow electric current to

flow in only one direction. Abbreviated as D.

Light Emitting

Diode (LED)

LED Circuit Symbol

LEDis used to emit light when a current is

passed through the device. It is abbreviated

as LED.

Zener Diode

Zener Diode Circuit Symbol

After a breakdown voltage, the device allows

current to flow in the reverse direction as

well. It is abbreviated as Z.

Photo Diode

Photo Diode Circuit Symbol

Photodiodeworks as a photo-detector and

converts light into its corresponding voltage

or current.

Tunnel Diode

Tunnel Diode Circuit Symbol

Tunnel Diodeis known for its high-speed

operation due to its application in quantum

mechanical effects.

Schottky Diode

Schottky Diode Circuit Symbol

TheSchottky Diodeis known for its large

forward voltage drop and hence has great

applications in switching circuits.

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Transistor

Electronic

Component

Circuit Symbol Description

NPN Transistor

Transistor NPN Circuit Symbol

This is a transistor with a layer of P-doped

semiconductor fixed between two layers of

N-doped semiconductors that act as the

emitter and collector. Abbreviated as Q.

PNP Transistor

Transistor PNP Circuit Symbol

This is a transistor with a layer of N-doped

semiconductor fixed between two layers of

P-doped semiconductors that act as theemitter and collector. Abbreviated as Q.

Phototransistor

Phototransistor Circuit Symbol

The working of aphototransistoris

similar to that of a bipolar transistor with a

difference that it converts light into its

corresponding current. The phototransistor

can also act as a photodiode if the emitter is

not connected.

Field Effect

Transistor

Field Effect Transistor Circuit Symbol

Like a transistor, aFEThas three terminals,

the Gate, Source and Drain. The device has

an electric field that controls the

conductivity of a channel of one type charge

carrier in a semiconductor substance.

N-Channel

Junction FET

n-channel Junction Field EffectTransistor (JFET) Circuit Symbol

TheJunction Field Effect Transistor

(JFET)is the simplest type of FET with

applications in Switching and voltage

variable resistor. In an N-channel JFET an

N-type silicon bar has two smaller pieces of

P-type silicon material diffused on each

sides of its middle part, forming P-N

unctions.

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P-Channel

Junction FET

p-channel Junction Field Effect

Transistor (FET) Circuit Symbol

P-channel JFET is similar in construction to

N-channel JFET except that P-type

semiconductor base is sandwiched between

two N-type junctions. In this case majority

carriers are holes.Metal Oxide

Semiconductor

FET

Given Below Abbreviated as MOSFET.MOSFETis a

three terminal device and is controlled by a

gate bias. It is known for its low capacitance

and low input impedance.

Enhancement

MOSFET

e-MOSFET Circuit Symbol

The enhancement MOSFET structure has no

channel formed during its construction.

Voltage is applied to the gate, so as to

develop a channel of charge carriers so that

a current results when a voltage is applied

across the drain-source terminals.

Abbreviated as e-MOSFET.

Depletion

MOSFET

d-MOSFET Circuit Symbol

In the depletion-mode construction a

channel is physically constructed and a

current between drain and source is due to

voltage applied across the drain-sourceterminals. Abbreviated as d-MOSFET.

Logic Gates

Gate Standard Symbol IEC Symbol Description

AND

Gate

AND GATE Symbol AND Gate IEC Symbol

If all the inputs of an AND

gate are HIGH, then the

output will also be HIGH.

If any one of them is LOW,

the output will also be

LOW.

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NAND

Gate

NAND Gate Symbol NAND Gate IEC Symbol

Short form for NOT AND

Gate. Of all the inputs are

HIGH, the output will be

LOW. If any one input is

LOW, the output will beHIGH.

OR

Gate

OR Gate Symbol OR Gate IEC Symbol

If any one of the input is

HIGH, the output will also

be HIGH. If both inputs

are LOW, the output will

also be LOW.

NOR

Gate

NOR Gate Symbol NOR Gate IEC Symbol

Short form for NOT OR. If

both inputs are LOW, the

output will also be LOW.

For other cases, the output

will be HIGH.

EX-

OR

Gate

EX-OR Gate Symbol EX-OR Gate IEC Symbol

Short form for Exclusive

NOR. If both inputs are

either in LOW state r

HIGH state, the output

will be LOW. If both

inputs are different, the

output will be HIGH.

EX-

NOR

Gate

EX-NOR Gate Symbol EX-NOR Gate IEC Symbol

Short form for Exclusive

NOT OR. If both the

inputs are the same, theoutput will be HIGH. If

both are different, the

output will also be

different.

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NOT

Gate

NOT Gate Symbol NOT Gate Symbol

Also known as the inverter

Gate. There is only one

input for this gate. If the

input is HIGH, the output

will be LOW. If the input is

LOW, the output will be

HIGH.

Meters

Electronic

Component

Circuit Symbol Description

Voltmeter

Voltmeter Circuit Symbol

oltmeteris used to measure the voltage at

a certain point in the circuit.

Ammeter

Ammeter Circuit Symbol

An Ammeter is used to measure the current

that passes through the circuit at a particular

point.

Galvanometer

Galvanometer Circuit Symbol

Agalvanometeris used to measure verysmall currents in the order of 1 milli ampere

or less.

Ohmmeter

Ohmmeter Circuit Symbol

Resistance of the circuit is measured using

an Ohmmeter.

Oscilloscope

Oscilloscope Circuit Symbol

An oscilloscope is used to measure the

voltage and time period of signals along with

their shape display.

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Sensors

Electronic

Component

Circuit Symbol Description

Light

Dependent

Resistor (LDR)

LDR Circuit Symbol

It is abbreviated as LDR.Light Dependent

Resistoris used to convert light into its

corresponding resistance. Instead of directly

measuring the light, it senses the heat content

and converts it onto resistance.

Thermistor

Thermistor Circuit Symbol

Instead of directly measuring the light, a

thermistor senses the heat content and

converts it into resistance. Abbreviated as

TH.

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Switches

Electronic Component Circuit Symbol Description

Push Switch

Push Switch Circuit Symbol

This is an ordinary switch that passes c

only upon pressing.

Push to Break Switch

Push to Break Switch Circuit Symbol

The push to break switch is usually k

the ON state (closed). It turns to OFF

(open) only when the switch is pressed.

Singe Pole Single Throw Switch

On Off Switch (SPST) Circuit Symbol

Also known as the ON/OFF switchswitch allows the flow of current only w

is kept ON. Abbreviated as SPST.

Single Pole Double Throw Switch

2-Way Switch (SPDT) Circuit Symbol

Also known as the 2-way switch. It can b

called as an ON/OFF/ON switch as it

OFF position in the center. The switch

the flow of current in two dire

depending on its position. It ca

abbreviated as SPDT.

Double Pole Single Throw Switch

Dual On-Off Switch (DPST) CircuitSymbol

Abbreviated as DPST. Can also be calledual ON-OFF switch. This is used to

between the live and neutral connecti

the main electrical line.

Double Pole Double Throw Switch

DPDT Circuit Symbol

Abbreviated as DPDT. The switch u

central OFF position and is appli

reversing switch for motors.

Relay Relayis abbreviated as RY. This device ca

switch a 230 Volt AC mains circuit. It ha

switching stages called Normally Open

Normally Closed (NC), and Common (COM).

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Relay Circuit Symbol

Audio and Radio Devices

Electronic

Component

Circuit Symbol Description

Microphone

Microphone Circuit Symbol

This device is used for converting sound to its

corresponding electrical energy. Abbreviated

as MIC.

Earphone

Earphone Circuit Symbol

Does the reverse process of microphone and

converts electrical energy into sound.

Loudspeaker

Loudspeaker Circuit Symbol

Does the same operation as an earphone, but

converts an amplified version of the electrical

energy into its corresponding sound.

Piezo-

Transducer

PiezoTransducer Circuit Symbol

It is a transducer that converts electrical

energy into sound.

Amplifier

Amplifier Circuit Symbol

Used to amplify a signal. It is mainly used to

represent a whole circuit rather than just one

component.

Aerial

Aerial Circuit Symbol

This device is used to transmit/receive

signals. Abbreviated as AE.

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