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Electronic Schematic Symbols
ComponentSymbolComponentSymbol
AntennaAntennaRelayRelay
BatteryBatteryRelay ContactsRelay Contacts
Bulb (indicator lamp)Indicator LampResistorResistor
CapacitorCapacitorResistor (Tapped)Tapped Resistor
Capacitor (Electrolytic)Electrolytic CapacitorResistor (Variable, Potentiometer)Variable Resistor or Potentiometer
Capacitor (Trimmer)Trimmer CapacitorSilicon Controlled Rectifier (SCR)Silicon Controlled Rectifier (SCR)
Capacitor (Variable)Variable CapacitorSpeakerSpeaker
Coil (Inductor)Coil or InductorSwitch (SPST)Switch
Connection (Chassis)Chassis ConnectionSwitch (Push Button)Push-Button Switch
Connection (Wires)Wire ConnectionSwitch (Rotary)Rotary Switch
No-Connection (Wires)Wires No-ConnectionSwitch (SPDT)Single-Pole-Double-Throw Switch
Crystal (Frequency)Frequency Crystal (Xtal)ThermistorThermistor
DiodeSemiconductor DiodeTransformer (Iron Core)Transformer
Diode (Shottky)Shottky DiodeTransformer (IF)Intermediate Frequency Transformer
Field Effect Transistor (FET) (N-Channel)Field Effect Transistor (FET)Transistor (NPN Bipolar)NPN Transistor
Field Effect Transistor (FET) (P-Channel)Field Effect Transistor (FET)Transistor (PNP Bipolar)PNP Transistor
FuseFuseVacuum Tube (Diode)Diode Vacuum Tube
Ground ConnectionGround ConnectionVacuum Tube (Triode)Triode Vacuum Tube
InductorInductorVacuum Tube (Tetrode)Tetrode Vacuum Tube
Inductor (Iron Core)Iron Core InductorVacuum Tube (Pentode)Pentode Vacuum Tube
Inductor (Variable)Variable Inductor -or- Variable InductorUnijunction TransistorUnijunction Transistor (UJT)
Light Emitting Diode (LED)LEDVaractorVaractor
MicrophoneMicrophoneVoltmeterVoltmeter
Motor (Electric)Electric MotorZener DiodeZener Diode
Phone JackPhone JackHeadphonesHeadphones
Photo CellPhoto CellCoax or Shielded CableCoax Cable

Note: Standard orientation of symbols is for inputs on left or top and outputs on right or bottom.

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