COMPONENT SYMBOL PICTURE/

DRAWINGDESCRIPTION

Wire To conduct or pass current from one part of a circuit to another.

Connected Wires

help to transmit current to other paths

SPST Toggle Switch

Disconnects current when open

SPDT Toggle Switch

Selects between two connections

Pushbutton Switch (N.O)

Momentary switch - normally open

Pushbutton Switch (N.C)

Momentary switch - normally closed

DIP SwitchDIP switch is used for onboard configuration

SPST RelayRelay open / close connection by an

electromagnet

SPDT RelayRelay open / close connection by an

electromagnet

JumperClose connection by jumper insertion on

pins.

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

Solder BridgeSolder to close

connection

Earth Ground

Used for zero potential reference and electrical shock

protection.

Chassis GroundConnected to the

chassis of the circuit

Fuse

A safety device, which will 'blow' or melt if the current flowing through itexceeds a

specified value.

Resistor (IEEE)Resistor reduces the

current flow.

Resistor (IEC)Resistor reduces the

current flow.

Potentiometer (IEEE)

Adjustable resistor - has 3 terminals

Potentiometer (IEC)

Adjustable resistor - has 3 terminals

Variable Resistor / Rheostat (IEEE)

Adjustable resistor - has 2 terminals.

Variable Resistor / Rheostat (IEC)

Adjustable resistor - has 2 terminals.

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

Trimmer Resistor Preset resistor

Thermistor

Thermal resistor - change resistance when temperature

changes

Photo resistor / Light dependent

resistor (LDR)

Photo-resistor - change resistance with light intensity

change

CapacitorCapacitor is used to

store electric charge. It acts as short circuit

with AC and open circuit with DC.

Capacitor

Capacitor is used to store electric charge. It acts as short circuit

with AC and open circuit with DC.

Polarized Capacitor

Electrolytic capacitor

Polarized Capacitor

Electrolytic capacitor

Variable CapacitorAdjustable

capacitance

InductorCoil / solenoid that

generates magnetic field

Iron Core Inductor Includes iron

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

Variable Inductor A coil whose effective inductancecan be

changed.

Voltage SourceGenerates constant

voltage

Current SourceGenerates constant

current.

AC Voltage Source AC voltage source

Generator

Electrical voltage is generated by

mechanical rotation of the generator

CellGenerates constant

voltage

BatteryGenerates constant

voltage

Controlled Voltage Source

Generates voltage as a function of voltage or current of other

circuit element.

Controlled Current Source

Generates current as a function of voltage or current of other

circuit element.

VoltmeterMeasures voltage. Has very high resistance. Connected in parallel.

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

Ammeter

Measures electric current. Has near zero resistance. Connected

serially.

Ohmmeter Measures resistance

WattmeterMeasures electric

power

Lamp / light bulbGenerates light when current flows through

Lamp / light bulbGenerates light when current flows through

Lamp / light bulbGenerates light when current flows through

Diode

Diode allows current flow in one direction only - left (anode) to

right (cathode).

Zener Diode

Allows current flow in one direction, but also

can flow in the reverse direction

when above breakdown voltage

Schottky DiodeSchottky diode is a

diode with low voltage drop

Varactor / Varicap Diode

Variable capacitance diode

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

Tunnel Diode

used for amplifying, switching, and

computer information storage and as an

oscillator

Light Emitting Diode (LED)

LED emits light when current flows through

PhotodiodePhotodiode allows current flow when exposed to light

NPN Bipolar Transistor

Allows current flow when high potential at

base (middle)

PNP Bipolar Transistor

Allows current flow when low potential at

base (middle)

Darlington Transistor

Made from 2 bipolar transistors. Has total gain of the product of

each gain.

JFET-N TransistorN-channel field effect

transistor

JFET-P TransistorP-channel field effect

transistor

NMOS TransistorN-channel MOSFET

transistor

PMOS TransistorP-channel MOSFET

transistor

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

Motor Electric motor

TransformerChange AC voltage from high to low or

low to high.

Electric bell Rings when activated

BuzzerProduce buzzing

sound

Fuse

The fuse disconnects when current above threshold. Used to protect circuit from

high currents.

Fuse

The fuse disconnects when current above threshold. Used to protect circuit from

high currents.

Step Up Transformer

The no. of turns in secondary winding is

more than that of primary winding.

Step Down Transformer

The no. of turns in secondary winding is

less than that of primary winding.

Crystal Oscillator

Used to generate clock signal of very precise frequency.

Optocoupler / Opto-isolator

Optocoupler isolates connection to other

board

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

LoudspeakerConverts electrical

signal to sound waves

MicrophoneConverts sound waves

to electrical signal

Operational Amplifier

Amplify input signal

Schmitt TriggerOperates with

hysteresis to reduce noise.

Analog-to-digital converter (ADC)

Converts analog signal to digital

numbers

Digital-to-Analog converter (DAC)

Converts digital numbers to analog

signal

Crystal OscillatorUsed to generate precise frequency

clock signal

Antenna / aerial

Transmits & receives radio waves

Antenna / aerial

Transmits & receives radio waves

Dipole AntennaTwo wires simple

antenna

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

NOT Gate (Inverter)

Outputs 1 when input is 0

AND GateOutputs 1 when both

inputs are 1.

NAND GateOutputs 0 when both inputs are 1. (NOT +

AND)

OR GateOutputs 1 when any

input is 1.

NOR GateOutputs 0 when any

input is 1. (NOT + OR)

XOR GateOutputs 1 when

inputs are different. (Exclusive OR)

D Flip-Flop Stores one bit of data

Multiplexer / Mux 2 to 1

Connects the output to  selected input line.

Multiplexer / Mux 4 to 1

Connects the output to  selected input line.

Demultiplexer / Demux 1 to 4

Connects selected output to the input

line.

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

Electric generatorElectrical voltage is

generated by mechanical rotation of

the generator

Unjoined wiresThis can only be shown by

bridging them or by drawing them without blobs. But bridging is

commonly practised as there will not arise any

confusion.

DC SupplyUsed as a DC power supply, that is, the

current will always flow in one direction.

AC SupplyUsed as AC power supply, that is, the current will keep

alternating directions.

Transformer Used as an ac power supply.

Earth/GroundUsed in electronic

circuits to represent the 0 volts of the

power supply

RheostatUsed to control the

current flow with two contacts

Potentiometerused to control the

voltage flow and has three contacts

Presetlow cost variable

resistors that are used to control the charge flow with the help of a

screw driver

Zener DiodeAfter a breakdown voltage, the device

allows current to flow in the reverse direction

as well.

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

Photo DiodeWorks as a photo-

detector and converts light into its

corresponding voltage or current.

Phototransistorsimilar to that of a

bipolar transistor with a difference that it

converts light into its corresponding current..

Field Effect Transistor

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

Is the simplest type of FET with applications in Switching and voltage

variable resistor.

P-Channel Junction FET

P-channel JFET is similar in construction

to N-channel JFET except that P-type

semiconductor base is sandwiched between two N-type junctions.

Metal Oxide Semiconductor

FET

A three terminal device and is controlled by a

gate bias

EX-NOR Gate

Short form for Exclusive NOT OR. If

both the inputs are the same, the output will

be HIGH.

NOT Gate

Also known as the inverter Gate. There is only one input for this

gate

GalvanometerUsed to measure very small currents in the

order of 1 milli ampere or less.

OscilloscopeUsed to measure the

voltage and time period of signals along

with their shape display.

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

Light Dependent Resistor

Used to convert light into its corresponding

resistance.

Thermistor Senses the heat content and converts it

into resistance.

Push SwitchThis is an ordinary switch that passes current only upon

pressing.

Push to Break Switch

The push to break switch is usually kept

in the ON state (closed). It turns to OFF state (open) only when the switch is pressed.

Single Pole Single Throw switch

Also known as the ON/OFF switch. This

switch allows the flow of current only when it

is kept ON.

Single Pole Double Throw Switch

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

also called as an ON/OFF/ON switch as it has an OFF position in

the center

Double Pole Single Throw Switch

. This is used to isolate between the live and neutral connections in

the main electrical line.

Double Pole Double Throw

Switch

The switch uses a central OFF position

and is applied as reversing switch for

motors.

RelayThis device can easily switch a 230 Volt AC

mains circuit.

EarphoneDoes the reverse

process of microphone

and converts electrical

energy into sound.

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

Piezo-transducerIt is a transducer that

converts electrical energy into sound.

AmplifierUsed to amplify a

signal. It is mainly used to represent a whole

circuit rather than just one component.

AerialThis device is used to

transmit/receive signals

Lighting LampThis is used to provide

light for the output.

Indicator LampUsed to convert

electrical energy into light. The best example is the warning light on

a car dashboard.

HeaterThis transducer is used

to change electrical energy into heat.

Bell

Used to produce a sound as the output, according to the electrical energy produced as the input.

BuzzerIt is used to produce an

output sound corresponding to the

electrical energy in the input.

Enhanced MOSFET

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

Depletion MOSFETIn the depletion-mode construction a channel

is physically constructed and a

current between drain and source is due to

voltage applied across the drain-source

terminals.

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

Capacitor-Polarized

Capacitor can be used in a timer circuit by adding a resistor.

Equipotentialitya symbol to identify parts

that have the same voltage

Chassis Connected to the chassis of the circuit.

AttenuatorIt is a device used to

lower the power of a

signal.

AccumulatorAccumulators are

designed to increase or

relieve pressure in the

system.

AntennaA antenna is a radio antenna that can be

made of a simple wire, with a center-fed driven

element.

Loop AntennaA loop antenna is a radio antenna consisting of a loop (or loops) of wire, tubing, or other electrical conductor with its ends connected to a balanced transmission line.

Circuit BreakerA circuit breaker is an

automatically operated electrical switch designed

to protect an electrical circuit from damage

caused by overload or short circuit.

Explosive SquibExplosive squib is often

used on stage and film to

trigger various special

effects.

OscillatorProduces a repetitive

electronic signal, often a sine wave or a square

wave.

COMPONENT SYMBOL PICTURE/ DRAWING

DESCRIPTION

Memristorused in signal processing,

logic/computation, non-volatile memory

etc.

Electrolytic Capacitor

Almost all electrolytic capacitors are

polarized and hence used in DC circuits

Feed through Capacitor

They provide low impedance path to

ground for high frequency signals

Ferrite Core Inductors

These are mostly used to suppress the interference of

electromagnetic waves.

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.

Laser DiodeThe laser diode is

similar to light emitting diode.

Photo DarlingtonPhoto Darlington Transistor is similar to phototransistor with very high gain and sensitivity

BufferIt is an audio signaling

device. Generally used in alarms, timers and for confirmation

messages.

Tri-State BufferSimilar to a normal buffer but with a

control signal

Flip FlopFlip flop is the also a memory element but this is a synchronous

device

ELECTRICAL AND ELECTRONICS

SYMBOLS

PLATE NO. 1

SUBMITTED BY: NICKKY AUREPHIL B. GERONIMO

SUBMITTED TO: ENGR. TUBAN