The idea of positive feedback was already current in the 1920s with the introduction of the regenerative circuit.

Such a regenerative circuit is capable of receiving weak signals, if carefully coupled to an antenna.

Such early systems were invariably super regenerative circuits, which meant that two controllers used in close proximity would interfere with one another.

Edwin Armstrong, invented and patented the regenerative circuit while he was a junior in college, in 1914.

In World War II the regenerative circuit was used in some military equipment.

On the same day, Irving Langmuir applied for a patent on his own regenerative circuit.

Regenerative circuits were invented and patented in 1914 for the amplification and reception of very weak radio signals.

After months of delay, Edwin H. Armstrong filed a patent application on his invention of the regenerative circuit.

Positive feedback around the tuned circuit ("regeneration") can also increase selectivity (see Q multiplier and Regenerative circuit).

The regenerative circuit allows an electronic signal to be amplified many times by the same vacuum tube or other active component such as a field effect transistor.

A regenerative circuit is often an AM detector, converting the RF signal on the antenna to an audio waveform.

An astable multivibrator is a regenerative circuit consisting of two amplifying stages connected in a positive feedback loop by two capacitive-resistive coupling networks.

Edwin Armstrong and David Sarnoff tested and perfected the regenerative circuit at the Wall site, on the night of January 31/February 1, 1914.

Appellate court credited De Forest with the regenerative circuit: "The decisions of the Commissioner are reversed and priority awarded to De Forest."

For many years, super regenerative circuits have been used for commercial products such as garage-door openers, radar detectors, microwatt RF data links, and very low cost walkie-talkies.

The wide-band regenerative circuit used Acorn triodes from RCA, and the receiving antenna had three pairs of dipoles and incorporated lobe switching.

He received in 1942 the AIEEs Edison Medal "for distinguished contributions to the art of electric communication, notably the regenerative circuit, the superheterodyne, and frequency modulation".

Nancy immediately found herself wondering why B'Elanna had chosen to align the injectors at such an odd angle and whether or not those were actually regenerative circuits she was looking at.

He invented the regenerative circuit while he was an undergraduate and patented it in 1914, followed by the super-regenerative circuit in 1922, and the superheterodyne receiver in 1918.

Lee De Forest filed a patent in 1916 that became the cause of a contentious lawsuit with the prolific inventor Armstrong, whose patent for the regenerative circuit had been issued in 1914.

In recent years the regenerative circuit has seen a modest comeback in receivers for low cost digital radio applications such as garage door openers, keyless locks, RFID readers and some cell phone receivers.

As an undergraduate, and later as a professor at Columbia University, Armstrong worked from his parent's attic in Yonkers, New York to develop the regenerative circuit, the superheterodyne receiver, and the superregenerative circuit.

It turned out to be a booster, designed to compensate for the losses of the others wherever the main curve of their output failed to conform to the specs laid down for it by the crude, over all regenerative circuit.

In particular, the regenerative circuit, which Armstrong patented in 1914 as a "wireless receiving system," was subsequently patented by Lee De Forest in 1916; De Forest then sold the rights to his patent to AT&T.

In 1914 Edwin Armstrong published an explanation of the Audion, and when the two later faced each other in a dispute over the Regenerative circuit patent, Armstrong was able to demonstrate conclusively that De Forest still had no idea how it worked.