. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. SINE WAVE OSCILLATORS tapping points: one, the intentional one on the inductance, and another unintentional one of the Colpitts type in virtue of the two stray capacitances between the ends of the tuned circuit and earth (Figure ). Since the two taps are unUkely to be at the same effective distance up the tuned circuit, the oscillator is liable to peculiar behaviour due to, as it were, not knowing which tap it is supposed to be using. The author has never experienced this difficulty an
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. SINE WAVE OSCILLATORS tapping points: one, the intentional one on the inductance, and another unintentional one of the Colpitts type in virtue of the two stray capacitances between the ends of the tuned circuit and earth (Figure ). Since the two taps are unUkely to be at the same effective distance up the tuned circuit, the oscillator is liable to peculiar behaviour due to, as it were, not knowing which tap it is supposed to be using. The author has never experienced this difficulty and has so far always used the Hartley circuit with satisfactory results. Probably the Colpitts circuit becomes necessary only at frequencies much higher than those usually of interest to electrobiologists. The Hartley and Colpitts oscillators are the important LC oscillators and are the only ones with which it is proposed to deal. We have now to attend to how to lead out the oscillations the circuit is generating. HT+ HT+. 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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