crystal detector

Thân thiện

A scientist adjusts the fine wire on a crystal detector.

Definition

1. Noun:
   • A type of early radio signal detector: A "crystal detector" is a simple electronic device used in early radio receivers to convert alternating current (AC) radio signals into direct current (DC) signals that can be heard through headphones. It consists of a thin wire (called a "cat's whisker") making contact with a piece of crystalline mineral, such as galena (lead sulfide).

Examples of Usage

• Noun:
  • Early amateur radio enthusiasts often built their own receivers using a crystal detector.
  • The simplicity of the crystal detector made it a crucial component in the development of early wireless communication.

Advanced Usage

• Historical Context: The term is primarily used in historical or technical discussions about the early history of radio and electronics.
  • The crystal detector, though obsolete, represents a fundamental principle in semiconductor technology.

Variants and Related Words

• Cat's whisker detector: Another name for a crystal detector, emphasizing the fine wire component.
• Semiconductor diode: A modern solid-state electronic component that performs a similar rectifying function and evolved from the principle of the crystal detector.

Synonyms

• Rectifier: A general term for any device that converts alternating current to direct current.
• Demodulator: A device that extracts the information-bearing signal from a carrier wave.

Related Phrases

• Crystal set: A simple radio receiver that uses a crystal detector, typically without a power amplifier.
  • He built a crystal set as a science project to demonstrate basic radio principles.

Học thuật

Noun

1. a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier