RuudNL
Well-known member
Recently I repaired a Neumann KMR82i microphone.
I noticed that the polarisation voltage is put on the capsule through a gate-drain junction of a FET, in fact a BF245B.
(Source wire was simpy cut off.)
What could be the advantage of using a FET here, instead of the usual high value (1 G.ohm or so) resistor?
I noticed that the polarisation voltage is put on the capsule through a gate-drain junction of a FET, in fact a BF245B.
(Source wire was simpy cut off.)
What could be the advantage of using a FET here, instead of the usual high value (1 G.ohm or so) resistor?