I have a problem with Maestro MIC2, not its possible transmit without high noise, such AC power, I tested dynamic microphone, electret capsule, Trust quasar headset, Heil Sound Proset Elite, Heil Sound Pro7, with and without BIAS all with same result. Also I removed the AC switched power supply using a linear power supply. It is possible that I have a hardware problem on Maestro?
https://vocaroo.com/i/s15MsA7A5DbR I attach audio sample of noise.
in advantage, Miguel EA5GF