Discussion
An electron microscope needs twenty kilovolts at a few microamps. Which topology suits it?
Answer: A
A multiplier reaches a high voltage from a modest transformer, and its poor regulation hardly matters when the load is small and steady - which is why photomultiplier and cathode-ray supplies use them. Schottkies have low voltage ratings, and both remaining options need a transformer wound for the full output voltage. Choosing a topology means matching its weakness to something the application does not need. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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