Practical Electronics/Basic Components

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

Power Sources

Voltage Source	Current Source	Controlled Voltage Source	Controlled Current Source	Single cell	Battery of cells

Grounds

Signal Ground		Chassis Ground		Earth Ground

Resistors

Resistor	Variable Resistor	Potentiometer

Capacitors

Capacitor	Polarized Capacitor	Variable Capacitor

Transformers

Air-core Transformer	Iron-core Transformer	Center-tapped Transformer	Autotransformer	Coil with tickler	Step up	Step down

Diodes

Diode		Light-Emitting Diode		Zener Diode		Schottky Diode

Transistors

			P-channel
			N-channel
JFET	IGFET enh	IGFET dep

	PNP
	NPN

Switches

Open Switch		Closed Switch

Greek characters

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

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References

• Electronic Symbols