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Index of Electronic Circuit Components

Introduction

This page is an alphabetical list of electronics components with their common circuit symbols. The headings with links lead to more detailed tutorial documents on those components. The unlinked headings are of very simple devices that are included only to illustrate their circuit symbols.

The descriptive documents will often refer to a component as either a passive or an active device. Passive components, such as resistors and capacitors, are generally two-terminal devices that have no external power source. Active devices, such as transistors, have more than two terminals and have are externally powered so that the device output can be amplified compared to an input.


Capacitors


Diodes


Fuses


Note: the SB in the example means "slow blow"

Ground or earth


Note: multiple ground symbols in a circuit imply that they are connected to a common ground.

Lamps


Inductors


Meters


Note: The voltmeter is used in parallel to measure the potential difference between two points and the ammeter is used in series to measure the current through a point.

Operational Amplifiers (op-amps)


Note: The power supply leads, V+ and V-, are often left out of circuit diagrams.

Oscillators (quartz crystal)


Power Supplies

Battery or dc power source

ac power sources


Resistors


Silicon-controlled rectifier (SCR)


Switches


Transformers


Transistors

bipolar

B = base, C = collector, and E = emitter

JFET
MOSFET
D = drain and S = source

Note: transistor terminals are usually not labeled in circuit diagrams.


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 Copyright © 2000 by Brian M. Tissue, all rights reserved.