Ballard, William Cyrus, Jr · New York [etc.] McGraw-Hill company, inc. · leaf 50
eration of any self-controlled system of this VACUUM TUBE OSCILLATORS 27 kind. For instance, if the sound produced by a telephonereceiver is of greater intensity than that which must beimpressed on the transmitter to produce the same sound,the system can be made to oscillate and produce a loud howl… … inputa/watt outputlOwatts Fig. 10.—Vacuum tube with its grid excited from an outside power source. Feedback Coupling.—In applying these principles to thevacuum tube, we must take some of the energy set freefrom the plate battery and bring it back to the grid cir-cuit where it can in turn control…
Radio
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