File:Neutrodyne circuit.png

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(1,944 × 1,611 pixels, file size: 21 KB, MIME type: image/png)

Captions

Captions

Add a one-line explanation of what this file represents
This circuit image could be re-created using vector graphics as an SVG file. This has several advantages; see Commons:Media for cleanup for more information. If an SVG form of this image is available, please upload it and afterwards replace this template with {{vector version available|new image name}}.


It is recommended to name the SVG file “Neutrodyne circuit.svg”—then the template Vector version available (or Vva) does not need the new image name parameter.

Summary

[edit]
Description
English: Schematic diagram of a triode vacuum tube RF amplifier stage with neutralization using the Neutrodyne circuit invented by Alan Hazeltine in 1922. RF amplifier stages like this were used in Tuned Radio Frequency (TRF) radio receivers during the 1920s. A major problem was that at radio frequencies the capacitance Cgp between plate and grid served as a feedback path, coupling energy from the plate ciruit back into the grid, so that the stage would become an oscillator, creating whistling and shrieking sounds in the output. In the Neutrodyne circuit, a second feedback signal of opposite phase was coupled from the plate to the grid through a capacitor CN. By adjusting the capacitor to provide the correct amount of feedback, this second signal will cancel or "neutralize" the feedback through Cgp, preventing oscillations. The feedback signal is taken from the opposite end of the grounded centertapped primary of the output interstage transformer T2, so it's phase is 180° opposite to the plate signal. Neutrodyne receivers were used until about 1930.
Date
Source Retrieved February 27, 2014 from C-W and A-M Transmitters and Receivers, Technical Manual TM11-665, September 1952, United States Dept. of the Army, p. 179, fig. A on Google Books
Author Unknown authorUnknown author

Licensing

[edit]
Public domain
This image is a work of a U.S. military or Department of Defense employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain in the United States.

العربية ∙ català ∙ čeština ∙ Deutsch ∙ Ελληνικά ∙ English ∙ español ∙ eesti ∙ فارسی ∙ suomi ∙ français ∙ galego ∙ हिन्दी ∙ hrvatski ∙ magyar ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ മലയാളം ∙ Malti ∙ Nederlands ∙ polski ∙ português ∙ português do Brasil ∙ română ∙ русский ∙ sicilianu ∙ slovenčina ∙ slovenščina ∙ српски / srpski ∙ ไทย ∙ Türkçe ∙ українська ∙ Tiếng Việt ∙ 中文 ∙ 中文（简体） ∙ 中文（繁體） ∙ +/−

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current19:19, 28 February 2014Thumbnail for version as of 19:19, 28 February 20141,944 × 1,611 (21 KB)Chetvorno (talk | contribs)Enlarged labels which were illegible
07:00, 28 February 2014Thumbnail for version as of 07:00, 28 February 20141,944 × 1,611 (20 KB)Chetvorno (talk | contribs)User created page with UploadWizard

You cannot overwrite this file.

There are no pages that use this file.

File usage on other wikis

The following other wikis use this file:

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Neutrodyne_circuit.png&oldid=283167006"