Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

VAR

Symbols

Varactor diode

A reverse-biased diode whose junction capacitance is used as a voltage-controlled circuit element.

Drawing use: Schematic
Application: Electronic components
Reference family: Manufacturer

A distinction that matters

A varactor uses junction capacitance under reverse bias; it is not an adjustable mechanical capacitor.

Full reference

C ADJ

Symbols

Adjustable capacitor

An adjustable capacitor provides a documented variable capacitance. Its control or preset adjustment is specified separately from the two main circuit terminals.

Drawing use: SLD / Schematic
Application: Control circuits
Reference family: IEC / Manufacturer

A distinction that matters

Adjustable capacitance changes a capacitive parameter; it is not an adjustable resistor.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.