. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. Figure Phantastron In this circuit one valve is used to its utmost; not only all three grids and the anode, but also the cathode fluctuate in potential to contribute to the action. Stripped of unessentials, the circuit has the appearance of Figure Ri, i?2 and ^3 are merely a potential divider across the HT supply to. Figure define the potentials of suppressor and control grid when the circuit is quies- cent. Notice the catching diode, which allows the control grid to mov
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. Figure Phantastron In this circuit one valve is used to its utmost; not only all three grids and the anode, but also the cathode fluctuate in potential to contribute to the action. Stripped of unessentials, the circuit has the appearance of Figure Ri, i?2 and ^3 are merely a potential divider across the HT supply to. Figure define the potentials of suppressor and control grid when the circuit is quies- cent. Notice the catching diode, which allows the control grid to move negative with respect to the junction of R^ and R^, but not positive. Before the arrival of the trigger pulse screen current flows and by cathode follower action the cathode is shghtly positive with respect to the control grid. As a result of the voltage drop along i?2 the suppressor is considerably more negative and in consequence anode current is cut off". On the arrival of a positive trigger, the suppressor potential is raised, allowing anode current to flow. Vertical fall occurs at the anode and is communicated to the control grid via C and to the cathode by cathode-follower action. Since control grid and cathode have fallen it is as if the suppressor potential had been raised, and Miller run-down can proceed even though the trigger pulse has come to an end. 17 245. 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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