. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. TUNED AMPLIFIERS input, by appropriate operation of the potentiometer—the Q control—then the overall gain at high frequencies is AI{1 + AB). At some intermediate frequency m,. the phase shift per filter section becomes 60 degrees and the overall phase shift is therefore 180 degrees. The feedback is now positive. Q control Output. Figure The overall gain rises to a maximum of ^4/(1 — ABF(co^)) where F(^CR 204. Please note that these images are extracted from scanned page images that m

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. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. TUNED AMPLIFIERS input, by appropriate operation of the potentiometer—the Q control—then the overall gain at high frequencies is AI{1 + AB). At some intermediate frequency m,. the phase shift per filter section becomes 60 degrees and the overall phase shift is therefore 180 degrees. The feedback is now positive. Q control Output. Figure The overall gain rises to a maximum of ^4/(1 — ABF(co^)) where F(^CR 204. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press

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