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This page shows some of the basic electronic circuit symbols that are used in some of our circuit diagrams. There are many more that we do not use so this is not an exhaustive list.

Electronic Symbols
Wire Symbols
Symbol Component name Symbol Component name
electrical wire symbol Electrical Wire connected wires symbolunconnected wires symbol Wires crossing but not joined
wire junction Wire junction multiple wire junction Multiple wire junction
joined wires Multiple wire junction terminal Test Point
test point Terminal chassis ground Chassis Ground
earth ground Earth Ground
Power Supply Symbols
Symbol Component name Symbol Component name
voltage source symbol DC Voltage Source current source symbol Current Source
ac power source symbol AC Voltage Source battery cell symbol Single Cell Battery
battery symbol Multiple Cell Battery controlled voltage source symbol Controlled Voltage Source
controlled current source symbol Controlled Current Source fuse symbol Fuse
fuse symbol Fuse transformer symbol Transformer
Switch and Relay Symbols
Symbol Component name Symbol Component name
SPST switch symbol SPST Toggle Switch SPDT switch symbol SPDT Toggle Switch
normally closed symbol Switch SPST normally closed normally open symbol Switch SPST normally open
dpst switch Switch DPST normally closed dpdt switch Switch DPST normally open
dip switch symbol DIP Switch spst relay symbol SPST Relay
spdt relay symbol SPDT Relay jumper symbol Jumper
solder bridge symbol Solder Bridge
Lamp / Light Bulb Symbols
Symbol Component name Symbol Component name
lamp symbol Lamp / light bulb lamp symbol Lamp / light bulb
lamp symbol Lamp / light bulb
Diode / LED Symbols
Symbol Component name Symbol Component name
diode symbol Diode zener diode Zener Diode
schottky diode symbol Schottky Diode varicap diode symbol Varactor / Varicap Diode
tunnel diode symbol Tunnel Diode led symbol Light Emitting Diode (LED)
photodiode symbol Photodiode
Resistor Symbols
Symbol Component name Symbol Component name
resistor symbol Resistor (IEEE) resistor symbol Resistor (IEC)
potentiomemer symbol Potentiometer (IEEE) potentiometer symbol Potentiometer (IEC)
variable resistor symbol Variable Resistor / Rheostat (IEEE) variable resistor symbol Variable Resistor / Rheostat (IEC)
Trimmer Resistor Thermistor
Photoresistor / Light dependent resistor (LDR)
Capacitor Symbols
Symbol Component name Symbol Component name
capacitor symbol Capacitor Capacitor
polarized capacitor symbol Polarized Capacitor polarized capacitor symbol Polarized Capacitor
variable capacitor symbol Variable Capacitor
Meter Symbols
Symbol Component name Symbol Component name
voltmeter symbol Voltmeter ammeter symbol Ammeter
ohmmeter symbol Ohmmeter wattmeter symbol Wattmeter
Misc. Symbols
Symbol Component name Symbol Component name
motor symbol Motor
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