#autodyne

• Autodyne — A radio receiver circuit or electronic tube in which the same active element (vacuum tube or transistor) simultaneously fulfills the role of a local oscillator and a detector-mixer for high-frequency signals; a regenerative receiver adjusted to the brink of oscillation for receiving continuous waves.
• Autodynes — The plural form of the noun autodină; a collection of electronic circuits or historical radio receivers based on using a single active element as both detector and local oscillator.
• Autodyne — An electronic device or circuit (historically used in superheterodyne radio receivers) consisting of a single electron tube or transistor that simultaneously fulfills the roles of both a local oscillator and a mixer stage (frequency changer), converting the received signal frequency into a stable intermediate frequency.