. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. Figure Figure the class of valve operation. Starting at the bottom, moving the tap up the coil increases the feedback, and the loop gain up to a maximum; thereafter the loop gain falls again because the grid leak, in parallel with the valve input resistance, is reflected across the tuned circuit by autotransformer action as a progressively lower resistance, thus damping it and reducing the Q. The best position for the tap is usually found by experiment; about 1/5 of the way up is
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. Figure Figure the class of valve operation. Starting at the bottom, moving the tap up the coil increases the feedback, and the loop gain up to a maximum; thereafter the loop gain falls again because the grid leak, in parallel with the valve input resistance, is reflected across the tuned circuit by autotransformer action as a progressively lower resistance, thus damping it and reducing the Q. The best position for the tap is usually found by experiment; about 1/5 of the way up is reasonable for a first guess. Colpitis oscillator In the Colpitts circuit {Figure ) which must necessarily be shunt-fed, the tuned circuit capacitance is tapped instead of the inductance. If the total tuning capacitance required is C, then the capacitances C„ and Q must be related to C by C = (C„Q)/(C„ + Q), and if the equivalent distance up the inductance for the tapping point is to be l/«th, then /i = Q + CJC^. HT* Choke. 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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