Electronics Handbook/Symbols

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Every electronic component has a symbol for easy identification in diagrams. Below is a quick reference, with more detailed symbols farther down.

Power Sources[edit]

Voltage Source.svg Current Source.svg Voltage Source (Controlled).svg Current Source (Controlled).svg Battery symbol1.svg Battery symbol2.svg
Voltage
Source
Current
Source
Controlled
Voltage
Source
Controlled
Current
Source
Single
cell
Battery
of cells

Grounds[edit]

Signal Ground.svg Chassis Ground.svg Earth Ground.svg
Signal
Ground
Chassis
Ground
Earth
Ground

Resistors[edit]

Resistor symbol America.svg Variable resistor symbol.svg Potentiometer symbol.svg
Resistor Variable
Resistor
Potentiometer

Capacitors[edit]

Capacitor Symbol.svg Polarized capacitor symbol alternative.svg Variable capacitor symbol 2.svg
Polarized capacitor symbol 2.svg
Polarized capacitor symbol 3.svg
Polarized capacitor symbol 4.svg
Capacitor
 
Polarized
Capacitor
Variable
Capacitor

Transformers[edit]

Transformer Air Core.svg Transformer Iron Core.svg Transformer Centre-tap Iron Core.svg Autotransformer.svg Transformer with Tickler.svg Transformer Step-up Air Core.svg Transformer Step-down Air Core.svg
Air-core
Transformer
Iron-core
Transformer
Center-tapped
Transformer
Autotransformer Coil with tickler Step up Step down

Diodes[edit]

Small diode symbol.png LED symbol.png Zener diode symbol.png Schottky diode symbol.png
Diode Light-Emitting
Diode
Zener
Diode
Schottky
Diode

Transistors[edit]

JFET P-Channel Labelled.svg IGFET P-Ch Enh Labelled.svg IGFET P-Ch Dep Labelled.svg P-channel
JFET N-Channel Labelled.svg IGFET N-Ch Enh Labelled.svg IGFET N-Ch Dep Labelled.svg N-channel
JFET IGFET enh IGFET dep
BJT symbol PNP.svg PNP
BJT symbol NPN.svg NPN

Switches[edit]

Open Switch.svg Closed Switch.svg
Open Switch Closed Switch

Greek characters[edit]

One reason people don't understand math or physics very well is that it literally is Greek to them.

  • alpha α
  • beta β
  • gamma γ
  • delta δ
  • epsilon ε
  • zeta ζ
  • eta η
  • theta θ
  • iota ι
  • kappa κ
  • lambda λ
  • mu μ
  • nu ν
  • xi ξ
  • pi π
  • piv ϖ
  • rho ρ
  • sigma σ
  • sigmaf ς
  • tau τ
  • upsilon υ
  • phi φ
  • chi χ
  • psi ψ
  • omega ω
  • Gamma Γ
  • Delta Δ
  • Theta Θ
  • Lambda Λ
  • Xi Ξ
  • Pi Π
  • Sigma Σ
  • Upsilon Υ
  • Phi Φ
  • Psi Ψ
  • Omega Ω


References[edit]