The combination of a balanced microphone transformer and a low noise amplifier is normally used for studio microphones. A design is shown to replace the transformer and associated amplifier. This incorporates the balanced and floating virtues of a transformer without the signal loss introduced ahead of a low noise amplifier. Gain and input stage current is adjustable. High common mode rejection is achieved with a balanced output and a very good noise figure at all gain settings.
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https://aes2.org/publications/elibrary-page/?id=11648
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