Electronics > Projects, Designs, and Technical Stuff

Fet preamp circuits for dynamic microphones

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Zero999:

--- Quote from: computerlen on August 08, 2020, 11:34:36 pm ---I just made contact with a tech who I sent the wiring diagram to. That is all I wanted. Someone to communicate with back and forth about the diagram. Someone who is showing genuine interest. No more of these chat rooms for me. Bye.

--- End quote ---
The whole point of a chat room is to communicate with many people simultaneously. If you don't want to do that, then this is not the place for you.

David Hess:

--- Quote from: magic on August 08, 2020, 06:29:14 am ---
--- Quote from: Marco on August 02, 2020, 11:53:25 pm ---A BF862 is so low noise in the audio band it simply doesn't matter any more.
--- End quote ---

That might be true.
Just the Johnson noise of a 150~200Ω dynamic mic is more than 1.5nV/rtHz.
--- End quote ---

Linear Integrated Systems and Interfet also make some suitable low frequency low noise JFETs, but they have a higher flicker noise and higher capacitance than a less expensive bipolar transistor.  The JFETs would be more suitable for a "universal" design because they could be used with both low and high impedance sources if their input capacitance was bootstrapped.

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