. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. Figure Figure The effect of this charging will be such as to cause the grid to become less positive, as shown in Figure The time constant C2R2 is chosen so that it would take much longer than the time of one cycle of oscillation for the charge on C2 to leak away via R^*. Thus when A swings negative again Cg remains flf-© Anode 1 current I. Figure Figure charged to approximately the peak voltage developed across Lg. Thus the voltage to which Cg charges represents a
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. Figure Figure The effect of this charging will be such as to cause the grid to become less positive, as shown in Figure The time constant C2R2 is chosen so that it would take much longer than the time of one cycle of oscillation for the charge on C2 to leak away via R^*. Thus when A swings negative again Cg remains flf-© Anode 1 current I. Figure Figure charged to approximately the peak voltage developed across Lg. Thus the voltage to which Cg charges represents a steady bias on the valve of magnitude proportional to the amplitude of oscillation. As the oscillations grow a point is reached at which, on the extreme negative excursions of grid voltage, the valve is cut off altogether {Figure ). It is now clear that the form of the anode current is of the form of a fundamental wave of frequency co plus harmonics. More important, as a result of the clipping of the waveform, a given proportional increase in the valve input can no longer produce a commensurate increase in anode current swing, that is, the effective valve gain is reduced. The amplitude of oscillations is therefore automatically stabilized, for any tendency to increase further is offset by a further reduction in effective valve gain, and vice versa. The equilibrium level of oscillation and the form of the anode current wave depend on the magnitude of Q, M and the valve gain. If this product is barely sufficient to maintain oscillation the output will be small and the anode current might have the form of Figure This is clearly substantially class But see under Blocking Oscillators 209. 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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