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Four Quadrant Power Supply Provides Any Polarity Voltage and Current: 01/08/04 EDN Design Ideas /
(added 1/05) A conventional power supply operates only in the first quadrant; positive-voltage output and current are sourced to a load or, with a deliberately miswired output,
statically in the third quadrant as a "minus" supply. The conventional supply cannot, however, operate in either the second quadrant as an adjustable load for a minus supply, for example, or
the fourth quadrant as a discharge-testing......
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