Understanding Electronics
www.kitronik.co.uk
Circuit Symbols
Kitronik Ltd – How to identify circuit symbols General symbols Joined conductors
Crossing conductors (not connected)
Resistor
Potentiometer
Preset potentiometer
Thermistor
Light dependent resistor (LDR)
Polarised capacitor
Non polarized capacitor
Diode
Light emitting diode (LED)
NPN transistor
Amplifier
Fuse
Resonator (2 pin)
www.kitronik.co.uk
Page 1 of 3
Understanding Electronics
www.kitronik.co.uk
Circuit Symbols
Resonator (3 pin)
Lamp
Motor
Loud speaker
Buzzer
Microphone
Solenoid
Integrated circuit (IC)
Switches Push to make switch
Push to break switch
Single pole single throw switch (SPST)
Single pole single throw switch (normally closed)
Single pole double throw switch (SPDT)
Double pole double throw switch (DPDT)
www.kitronik.co.uk
Page 2 of 3
Understanding Electronics
www.kitronik.co.uk
Circuit Symbols
Opto-switch
Relay (shown with double throw contacts)
AND gate
OR gate
NOT gate (Inverter)
NAND gate
NOR gate
Dry reed switch
Logic Gate
Power sources Battery (Primary cell)
www.kitronik.co.uk
Batteries
Power supply
Page 3 of 3