. Electronic apparatus for biological research . 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 wavefo
. Electronic apparatus for biological research . 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
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