Hi! I am trying to make a box that will be inserted between a wireless microphone receiver and a mixer which will unmute the audio once a strong and persistent enough signal is detected. I came up with this circuit but I want to be sure that it can work before I build it. I also want to make sure I understood correctly some things about the mic/receiver signal.
I chose the mosfet design because relays would introduce pops. I chose to short the audio signals in order to keep the (possible?) DC offset and so to avoid clicks (and to avoid passing the signal through silicon). Is there a DC bias expected on XLR lines (coming from the receiver)?
I am mostly worried about the amplifier circuit: I removed the usual 0.1uF decoupling capacitor on the input because 1) I am afraid it will "load" the line(alter the audio?) 2) the signal is expected to be centered around 0 anyway(right?).
From what I read I understood that: the audio signal is indeed centered around 0V but all the references about -40db or -60db refer to the absolute value of the signal aka p-p. Is it so?
I chose the mosfet design because relays would introduce pops. I chose to short the audio signals in order to keep the (possible?) DC offset and so to avoid clicks (and to avoid passing the signal through silicon). Is there a DC bias expected on XLR lines (coming from the receiver)?
I am mostly worried about the amplifier circuit: I removed the usual 0.1uF decoupling capacitor on the input because 1) I am afraid it will "load" the line(alter the audio?) 2) the signal is expected to be centered around 0 anyway(right?).
From what I read I understood that: the audio signal is indeed centered around 0V but all the references about -40db or -60db refer to the absolute value of the signal aka p-p. Is it so?
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