Circuit Schematic Symbols

Note: The schematics symbols for most major electrical components can be found in this table. However, each component may have numerous possible representations. In cases where there is more than one common symbol we have tried to give an alternate representation

Operational Amplifier
Or Gate
Outlet, Utility, 117-V
Outlet, Utility, 234-V
Photocell, Tube
Plug, Phone, 2-Conductor
Plug, Phone, 3-Conductor
Plug, Phono
Plug, Utility, 117-V
Plug, Utility, 234-V
Positive Voltage Connection
Potentiometer
Probe, Radio-Frequency
Rectifier, Semiconductor
Rectifier, Silicon-Controlled
Rectifier, Tube-Type
Relay, DPDT
Relay, DPST
Relay, SPDT
Relay, SPST
Resistor
Resonator
Rheostat
Saturable Reactor
Shielding
Signal Generator
Speaker
Switch, DPDT
Switch, DPST
Switch, Momentary-Contact
Switch, Rotary
Switch, SPDT
Switch, SPST
Terminals, General, Balanced
Terminals, General, Unbalanced
Test Point
Thermocouple
Thyristor
Transformer, Air-Core
Transformer, Iron-Core
Transformer, Tapped Primary
Transformer, Tapped Secondary
Transistor, Bipolar, npn
Transistor, Bipolar, pnp
Transistor, Field-Effect, N-Channel
Transistor, Field-Effect, P-Channel
Transistor, Metal-Oxide, Dual-Gate
Transistor, Metal-Oxide, Single-Gate
Transistor, Photosensitive
Transistor, Unijunction
Tube, Diode
Tube, Pentode
Tube, Photomultiplier
Tube, Tetrode
Tube, Triode
Unspecified Component
Voltmeter
Wattmeter
Wires
Wires, Connected, Crossing
Wires, Not Connected, Crossing