Some simple phantom powered FET preamp schematics

http://www.till.com/articles/PreampCable


https://pubs.shure.com/guide/MX400D/es-ES
(Just a JFET?)


https://www.elektroda.pl/rtvforum/topic1197474.html


http://www.hansenaudio.se/Active%20DI%20box%201975.jpg


https://www.spainlabs.com/foros/tema-Microfono-Electret