A balanced view, Part I
People often get confused when grappling with the many kinds of balanced, unbalanced, and ground-cancelling inputs and outputs; given the many permutations and variations this is not surprising. Balanced or quasi-balanced connections have been used for many years in professional circles, and are now slowly but apparently steadily increasing in popularity in the more expensive reaches of the hi-fi market. In this area the outputs are usually balanced by driving the cold line with an inverter rather than going for the full quasi-balanced version, and very sensibly so. The input amplifiers are usually the classic one-op-amp differential stage, though now and then some very complicated instrumentation-amp circuits have been ...
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