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Electricity > Circuit Symbols

Symbol Component
Joined conductor
Joined conductor
Fixed resistor
Variable resistor
Potentiometer
Potentiometer
Preset Potentiometer
Preset Potentiometer
Thermistor
Thermistor
Light-dependent Resistor
Polarised Capacitor
Non-polarised Capacitor
Power supply
Power supply
Crossing Conductors (no connection)
Crossing Conductors (no connection)
Diode
Light-emitting diode (LED)
NPN transistor
NPN transistor
Amplifier
Amplifier
Fuse
Fuse
Resonator
Resonator
Primary or secondary cell
Battery of cells
Single-pole-single-throw switch (SPST) (normally open)
Single-pole-single-throw switch (SPST) (normally open)
 
Symbol Component
Single-pole-single-throw switch (SPST) (normally closed)
Single-pole-single-throw switch (SPST) (normally closed)
Single-pole-double-throw switch (SPDT)
Single-pole-double-throw switch (SPDT)
Double-pole-double-throw switch (DPDT)
Double-pole-double-throw switch (DPDT)
Push-to-make switch (PTM)
Push-to-make
switch (PTM)
Push-to-break switch (PTB)
Push-to-break switch (PTB)
Dry-reed switch
Dry-reed switch
Opto switch
Opto switch
Relay
Relay
Lamp
Motor
Motor
Loud speaker
Loud speaker
Solenoid
Solenoid
Buzzer
Buzzer
Microphone
Microphone
Logic Gate: AND
Logic Gate: AND
Logic Gate: OR

Logic Gate: OR
Logic Gate: NOT (inverter)
Logic Gate: NOT (inverter)
Logic Gate: NAND
Logic Gate: NAND
Logic Gate: NOR
Logic Gate: NOR
Integrated circuit (IC)
Integrated circuit (IC) (see below)

Integrated Circuits

Fig 1: 555 timer IC
Fig 1:
555 timer IC

This diagram (see fig 1) shows the circuit connections (numbered to show which legs used) e.g. a 555 timer IC.

Fig 2: Quad 2-input NAND gate IC
Fig 2:
Quad 2-input NAND gate IC

Integrated circuits may also be drawn to show how their leg connections correspond to their function e.g. a Quad 2-input NAND gate IC (see fig 2).