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What is inductance (NOT impedance!) of typical dynamic microphone?
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Conrad Hoffman:
Entire books have been written about making electrical models. I usually model PZT devices like crystals, for which there are simple widely published formulas. Not sure about a dynamic, but it's going to be similar to a speaker. I've always liked this diagram from an old General Radio manual because the presentation is easy to understand. Note that "c" means Hz. Don't be surprised if an equivalent network uses impractically large inductances. I'd start by measuring reactance within the frequencies of interest. If you need to convert them to a more useful form I've got an impedance converter here, first item- http://www.conradhoffman.com/chsw.htm

Conrad Hoffman:
A dynamic mic and a loudspeaker are really the same device. In fact the reciprocity principle is used to calibrate microphones. This is a good read-
https://en.wikibooks.org/wiki/Engineering_Acoustics/Transducers_-_Loudspeaker
Zero999:

--- Quote from: Conrad Hoffman on May 23, 2023, 08:00:19 pm ---A dynamic mic and a loudspeaker are really the same device. In fact the reciprocity principle is used to calibrate microphones. This is a good read-
https://en.wikibooks.org/wiki/Engineering_Acoustics/Transducers_-_Loudspeaker

--- End quote ---
True. A dynamic microphone is more like a small headphone transducer, as it's roughly the same size.
dmills:
And in fact if you plug an SM57 into the headphone out on the desk with a bodge lead you can use it to swear at the talent for behaving badly on stage...

Who? Me? Never.

Regards, Dan.
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