Electrical Circuit Symbols
A quick reference for common electronic symbols.
Passive Components
Resistor
Opposes the flow of current.
Capacitor
Stores energy in an electric field.
Inductor
Stores energy in a magnetic field.
Semiconductors
Diode
Allows current to flow in one direction.
NPN BJT
Bipolar Junction Transistor (NPN type).
PNP BJT
Bipolar Junction Transistor (PNP type).
Logic Gates
AND Gate
Output is true only if all inputs are true.
OR Gate
Output is true if at least one input is true.
NOT Gate (Inverter)
Output is the opposite of the input.
Switches
SPST Switch
A simple on-off switch.
SPDT Switch
Connects a common terminal to one of two others.
Pushbutton (NO)
Circuit connects when button is pressed.