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• 20:34, 28 May 2024 Peter talk contribs created page Butterfly circuit (Created page with "In the words of the patent application, <blockquote> The principal object of the present invention is to provide ultra-high-frequency tuning apparatus which is readily tunable over a wide frequency range, and which avoids the difficulties of erratic operation encountered in some existing resonant circuit controls. </blockquote> The arrangement consist of a butterfly-type capacitor (two sets of stator plates with a butterfly-shaped rotor that needs no electrical connect...")