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Four Quadrant Power Supply Provides Any Polarity Voltage & Current - 01/08/04 EDN-Design
Ideas: 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,.....(design idea added 1/05)