. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. THE MULTI-VIBRATOR given gain, g^^L^ we see that a figure of merit for pentodes for this and other types of high speed pulse work is merely g„JCg,^. Screen-coupled multi-vibrators—Sometimes it is desirable to make a multi- vibrator work into an inductive load such as a relay coil or lightly loaded transformer. If a triode multi-vibrator is used the presence of the inductance in place of pure resistive loads seriously modifies the mode of operation, and renders it highly dependent on the na
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. THE MULTI-VIBRATOR given gain, g^^L^ we see that a figure of merit for pentodes for this and other types of high speed pulse work is merely g„JCg,^. Screen-coupled multi-vibrators—Sometimes it is desirable to make a multi- vibrator work into an inductive load such as a relay coil or lightly loaded transformer. If a triode multi-vibrator is used the presence of the inductance in place of pure resistive loads seriously modifies the mode of operation, and renders it highly dependent on the nature of the inductive load. A solution is to use pentodes and obtain the feedback signals from the screens. The anodes are then free for the driving of almost any kind of load, without affecting the operation of the multi-vibrator proper (Figure ). It must HT+. Figure be borne in mind that so far as speed of transition is concerned this is a triode, not a pentode, multi-vibrator, as there is now considerable Miller capacitance from screens to control grids. Cathode coupled multi-vibrators Consider a circuit like Figure V^ is a cathode follower and V^ a triode amplifier. If K^ grid is made very negative with respect to earth, V^ is cut off and V^ acts as an amplifier valve automatically biased by R^ to some anode current such that the anode potential is, say, V^. HT-f. 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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