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Was (wer) ist regenerative$68369$ - definition
![Armstrong circuit]], in which the feedback was applied to the input (grid) of the tube with a "tickler coil" winding on the tuning inductor.](https://commons.wikimedia.org/wiki/Special:FilePath/Armstrong regenerative receiver circuit.svg?width=200 "Armstrong circuit]], in which the feedback was applied to the input (grid) of the tube with a \"tickler coil\" winding on the tuning inductor.")
![Rear view of the above radio, showing the simplicity of the regenerative design. The tickler coil is visible inside the tuning coil and is turned by a shaft from the front panel; this type of adjustable transformer was called a ''[[variocoupler]]''.](https://commons.wikimedia.org/wiki/Special:FilePath/Regenerartive Receiver-S7300056.JPG?width=200 "Rear view of the above radio, showing the simplicity of the regenerative design. The tickler coil is visible inside the tuning coil and is turned by a shaft from the front panel; this type of adjustable transformer was called a ''[[variocoupler]]''.")
![DoE]]](https://commons.wikimedia.org/wiki/Special:FilePath/Energy flows in car.svg?width=200 "DoE]]")
.jpg?width=200 "A Tesla Model S P85+ using regenerative braking power in excess of 60 kW. During regenerative braking the power indicator is green")
Wikipedia
A regenerative circuit is an amplifier circuit that employs positive feedback (also known as regeneration or reaction). Some of the output of the amplifying device is applied back to its input so as to add to the input signal, increasing the amplification. One example is the Schmitt trigger (which is also known as a regenerative comparator), but the most common use of the term is in RF amplifiers, and especially regenerative receivers, to greatly increase the gain of a single amplifier stage.
The regenerative receiver was invented in 1912 and patented in 1914 by American electrical engineer Edwin Armstrong when he was an undergraduate at Columbia University. It was widely used between 1915 and World War II. Advantages of regenerative receivers include increased sensitivity with modest hardware requirements, and increased selectivity because the Q of the tuned circuit will be increased when the amplifying vacuum tube or transistor has its feedback loop around the tuned circuit (via a "tickler" winding or a tapping on the coil) because it introduces some negative resistance.
Due partly to its tendency to radiate interference when oscillating,: p.190 by the 1930s the regenerative receiver was largely superseded by other TRF receiver designs (for example "reflex" receivers) and especially by another Armstrong invention - superheterodyne receivers and is largely considered obsolete.: p.190 Regeneration (now called positive feedback) is still widely used in other areas of electronics, such as in oscillators, active filters, and bootstrapped amplifiers.
A receiver circuit that used larger amounts of regeneration in a more complicated way to achieve even higher amplification, the superregenerative receiver, was also invented by Armstrong in 1922.: p.190 It was never widely used in general commercial receivers, but due to its small parts count it was used in specialized applications. One widespread use during WWII was IFF transceivers, where single tuned circuit completed the entire electronics system. It is still used in a few specialized low data rate applications, such as garage door openers, wireless networking devices, walkie-talkies and toys.
