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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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