. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. DOUBLE-SIDED AMPLIFIERS Depending on the nature of the input circuits, it may be possible as an alternative to carry out gain balancing at the grids {Figure ). R^ and i?2 form a fixed potentiometer which reduces the input to the lower valve by a factor 0-9. If R^ is a quarter of R^, then when the slider is in the middle the input to the upper valve is also reduced to 0-9. When the slider is at a the feed to the upper valve is 10 per cent high, and when at ^ it is 10 per cent low. Stat
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. DOUBLE-SIDED AMPLIFIERS Depending on the nature of the input circuits, it may be possible as an alternative to carry out gain balancing at the grids {Figure ). R^ and i?2 form a fixed potentiometer which reduces the input to the lower valve by a factor 0-9. If R^ is a quarter of R^, then when the slider is in the middle the input to the upper valve is also reduced to 0-9. When the slider is at a the feed to the upper valve is 10 per cent high, and when at ^ it is 10 per cent low. Static balance This is a problem which occurs only in direct-coupled amplifiers, and refers to the requirement that when the difference of potential between the input terminals is zero the difference of potential between the output terminals is also zero. An coupled amplifier is self-adjusting in this respect, since in the absence of any input the potentials of the output terminals automatically return to that of the point P, usually earth, and so become equal to each other {Figure ). HT+. X[P Output. 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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