Definition

1. Noun (Physics, Electronics):

   • A type of circuit or device: An "autodyne" is a self-oscillating detector or mixer circuit used in radio receivers, where the same vacuum tube or transistor serves both as an oscillator and a mixer to convert radio frequency signals to an intermediate frequency. It is a form of heterodyne receiver that does not require a separate local oscillator.

2. Adjective (Physics, Electronics):

   • Self-heterodyne: Relating to or denoting a circuit or device that performs both oscillation and detection/mixing functions within a single active component, as in an autodyne receiver.

Usage Examples

• Noun:

  • Early radio enthusiasts often built simple autodynes for receiving AM broadcasts. (A self-oscillating detector circuit used in early radio receivers.)
  • The autodyne was a popular design in the 1920s due to its simplicity and low cost. (A type of receiver that combined oscillator and mixer functions.)

• Adjective:

  • The autodyne principle allows a single transistor to replace two separate stages. (The self-heterodyne principle where one component performs both roles.)
  • This circuit uses an autodyne configuration for frequency conversion. (A configuration where oscillation and mixing occur in one element.)

Advanced Usage

• "Autodyne receiver": A specific type of radio receiver that employs the autodyne principle for signal detection and frequency conversion.

  • The autodyne receiver was a stepping stone toward more advanced superheterodyne designs. (A receiver that uses a self-oscillating mixer.)

• "Autodyne oscillator": A circuit that simultaneously oscillates and mixes signals, often used in early radio technology.

  • In an autodyne oscillator, the feedback loop is carefully tuned to maintain oscillation while allowing signal mixing. (A circuit that combines oscillation and mixing.)

Variants and Related Words

• Heterodyne (n/adj): A technique of mixing two frequencies to produce a beat frequency, often used in radio receivers.

  • The superheterodyne receiver improved upon the autodyne by using a separate local oscillator. (A more advanced form of heterodyne receiver.)

• Self-oscillating (adj): Describing a circuit that generates its own oscillation without an external signal.

  • A self-oscillating mixer is the core of the autodyne design. (A circuit that oscillates internally.)

Synonyms

• Self-heterodyne (adj): A synonym for autodyne, emphasizing the self-mixing property.
• Homodyne (adj): A related but distinct term where the oscillator frequency matches the incoming signal exactly, used in direct conversion receivers.

Related Idioms

Phrasal Verbs