Discussion
Which device would you choose for a low-noise microphone preamplifier?
Answer: A
A dynamic microphone is a low-impedance source, and a bipolar device's low equivalent input noise voltage suits a low source impedance best. Field effect devices excel with high-impedance sources, where their negligible input current noise dominates the comparison. Which family is quieter depends entirely on the source impedance, which is why low-noise design begins by measuring the source rather than by choosing a device.
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