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Old 20th December 2019
Lives for gear
ruffrecords's Avatar
Originally Posted by David Rick View Post
AC coupling will prevent any DC current from phantom power resistor mismatch or other offsets from flowing though this shunt resistor. It will see only the audio signal power, which is negligible.
Any such dc current would be well within the rating of any 1/4 or 1.8 watt resistor. if there was any dc imbalance, which is unlikely except under fault conditions, I would be more worried about its effect on the mic transformer core than on the resistor
Also you can use a potentiometer to produce variable impedance. The pot must not have DC on it or it will crackle.
Whole different ball game.