. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. NEGATIVE VOLTAGE FEEDBACK AND THE STABILIZED GAIN AMPLIFIER If the valve is a pentode Rj^ <^ r„ and the output impedance is given with sufficient accuracy merely by 1/^^. For both triode and pentode it is real and positive, meaning that the output impedance is resistive. ^,„ is typically 5 mA/V, giving an output resistance of only 200 This is very low com- pared with the output resistance of an amphfying stage, which is for a pentode substantially equal to the load, say 100,000 Q. {
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. NEGATIVE VOLTAGE FEEDBACK AND THE STABILIZED GAIN AMPLIFIER If the valve is a pentode Rj^ <^ r„ and the output impedance is given with sufficient accuracy merely by 1/^^. For both triode and pentode it is real and positive, meaning that the output impedance is resistive. ^,„ is typically 5 mA/V, giving an output resistance of only 200 This is very low com- pared with the output resistance of an amphfying stage, which is for a pentode substantially equal to the load, say 100,000 Q. {Figure ), and HT +. 9r ,f>Vo. 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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