A pair of electronic devices for detecting restricted-band audio and ultrasonic frequencies |
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| Authors: | David L Hoats |
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| Institution: | 1. Edward R. Johnstone Training and Research Center, 08505, Bordentown, New Jersey
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| Abstract: | Two devices, the bandpass active filter and the phase-locked loop, are briefly discussed, with applications of each. The reader is directed to further sources of information on theory and practical circuitry as well as to sources of components and finished units. |
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