Hi Everyone,
Long time lurker, first time poster. I'm saving up for an RV10 kit, but in the meantime I am in a flying club with a few Archers. Most of the club members are strict pilots and couldn't answer my technical questions- I figure the members of this forum would probably know the ins-and-outs of avionics off the top of their heads.
TLDR:
I'm looking for some incite into how the mic input works on a standard audio panel- namely, if something is wrong with my microphone circuit are they short tolerant or could that destroy the panel?
Details:
I have (for non-aviation use) a set of cowin (or insert other cheap imported) noise canceling headphones that are dirt cheap ($40) and work well in cockpit. I am looking to modifying them into an aviation headset - primarily for passengers as i cant rationalize owning 2-3 additional headsets at $500 (min) each. My goal is to be able to add a ~$75 attachment (adds a mic and matches the impedance on the audio) to my $40 ANR headset and have a nice option for my passengers.
The speaker part is easy- just a 300ohm to 8ohm audio amp which works, the mic is more interesting. I built an electret condenser to carbon mic conversion circuit to take advantage of the mechanically noise canceling mic's that are available for fairly cheap. I put my normal headset on a 10V power supply and spoke into it while recording the signal on an oscilloscope, and did the same with my test circuit and everything looks good. My major concern is that, because the audio panel is a 'black box' that i don't fully understand, that it is possible to damage the panel if the circuit is not correct. It is an un-powered circuit (the audio panel provides the power) so my main concern would be a dead short.
Is there anything I should be concern with? Am I overthinking this?
Thanks,
Michael.
Long time lurker, first time poster. I'm saving up for an RV10 kit, but in the meantime I am in a flying club with a few Archers. Most of the club members are strict pilots and couldn't answer my technical questions- I figure the members of this forum would probably know the ins-and-outs of avionics off the top of their heads.
TLDR:
I'm looking for some incite into how the mic input works on a standard audio panel- namely, if something is wrong with my microphone circuit are they short tolerant or could that destroy the panel?
Details:
I have (for non-aviation use) a set of cowin (or insert other cheap imported) noise canceling headphones that are dirt cheap ($40) and work well in cockpit. I am looking to modifying them into an aviation headset - primarily for passengers as i cant rationalize owning 2-3 additional headsets at $500 (min) each. My goal is to be able to add a ~$75 attachment (adds a mic and matches the impedance on the audio) to my $40 ANR headset and have a nice option for my passengers.
The speaker part is easy- just a 300ohm to 8ohm audio amp which works, the mic is more interesting. I built an electret condenser to carbon mic conversion circuit to take advantage of the mechanically noise canceling mic's that are available for fairly cheap. I put my normal headset on a 10V power supply and spoke into it while recording the signal on an oscilloscope, and did the same with my test circuit and everything looks good. My major concern is that, because the audio panel is a 'black box' that i don't fully understand, that it is possible to damage the panel if the circuit is not correct. It is an un-powered circuit (the audio panel provides the power) so my main concern would be a dead short.
Is there anything I should be concern with? Am I overthinking this?
Thanks,
Michael.