The regenerative circuit (or self-regenerative circuit) or "autodyne" allows an electronic signal to be amplified many times by the same vacuum tube or other active component such as a field effect transistor. It consists of an amplifying vacuum tube or transistor with its output connected to its input through a feedback loop, providing positive feedback. This circuit was widely used in radio receivers, called regenerative receivers, between 1920 and World War II. The regenerative receiver was invented and patented in 1914 by American electrical engineer Edwin Armstrong when he was an undergraduate at Columbia University. Regenerative receiver circuits are still used in low-cost electronic equipment such as garage door openers.
Read more about Regenerative Circuit: How It Works, Advantages and Disadvantages, History, Operating Limits, Super-regenerative Receiver, Patents
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