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Unblocking the pump

Unblocking the pump
Although the pump circuit, in one or other of its many guises, has been used in electronics for some fifty years, textbook explanations of its operation tend to be either sketchy and qualitative or overly mathematical. This article aims to remove the confusion surrounding the circuit by concentrating on its physical operating mechanisms and to show that algebraic analysis can be replaced by a simple, but novel, graphical procedure.
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