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Armstrong oscillator
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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Opto-electronic_oscillator/bRn0jT2J">Opto-electronic oscillator</a></li></ul> <h2 id="external-links">External links</h2> <ul><li> Media related to Armstrong oscillators at Wikimedia Commons</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>US 1113149, Armstrong, Edwin H., "Wireless receiving system", published 19 October 1913, issued 6 October 1914 . In Figure 1, a tapped inductor ("auto-transformer") provides the feedback; in Figure 6, a transformer provides the feedback. <a href="https://worldwide.espacenet.com/textdoc?DB=EPODOC&IDX=US1113149" target="_blank">https://worldwide.espacenet.com/textdoc?DB=EPODOC&IDX=US1113149</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>DE 291604, Meissner, Alexander, "Einrichtung zur Erzeugung elektrischer Schwingungen", published April 10, 1913, issued June 23, 1919 , [Equipment for production of electrical oscillations] in German. The patent does not mention Meissner; the patent was issued to Gesellschaft für Drahtlose Telegraphie mbH [Corporation for Wireless Telegraphy]. See also: Meissner, Alexander. "Production of waves by cathode-ray tubes" U.S. Patent No. 1,924,796. (filed: 16 March 1914; issued: 29 August 1933). <a href="https://worldwide.espacenet.com/textdoc?DB=EPODOC&IDX=DE291604" target="_blank">https://worldwide.espacenet.com/textdoc?DB=EPODOC&IDX=DE291604</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Edwin H. Armstrong, Some recent developments in the audion receiver, Proceedings of the Institute of Radio Engineers, September 1915, pages 215-238 <a href="https://babel.hathitrust.org/cgi/pt?id=nyp.33433069055543&seq=223" target="_blank">https://babel.hathitrust.org/cgi/pt?id=nyp.33433069055543&seq=223</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Grebennikov, A. (2007), RF and Microwave Transistor Oscillator Design, Wiley, ISBN 978-0-470-02535-2 <a href="978-0-470-02535-2" target="_blank">978-0-470-02535-2</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> </ol>