![]() ![]() Transformers in analogue signal paths tend to be frowned upon today, with differential amplifiers used in preference. Most items of mains-powered audio equipment contain a mains transformer, and some other items – albeit fewer than five decades ago – contain signal transformers also, usually at their input or output. For it was he who first demonstrated that electromagnetic induction can be used to link one electrical circuit to another. But a time-travelling Faraday – bemused by radio frequency communication, lasers and sound reproduction in general – would find something reassuringly familiar in the transformer. There isn't much in a modern hi-fi system that would be familiar to the great 19th century English physicist Michael Faraday. They're crucial to hi-fi, but how do they work? Keith Howard explains all.
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