Dual Aviation Headset to Line Converter

[fvzeppelin]

Hi all,

cleaning up the basement, I have found my good old aviation headset and asked myself if I could use it with my PC flight sim 🙂

And, additionally, I want to be able to use two headsets 😀

So, the task is:
Build a box where I can plug in 2 aviation headsets on the one side and my PC line in/out connectors on the other side. Both, the headset mics and phones shall have volume controls. And the two mics shall be mixed. Optionally, I want to be able to shut off each mic to be able to implement a push-to-talk thing later.

So far, I have made my mind about the microphone part and I have attached the schematic. But as I'm absolutely not an expert for this kind of circuits, it would be great if you could have a look at it and let me know what ou think?

Questions which I have in mind at the moment:

• is the +6V generation better or worse than a simple voltage divider with 2 resistors in terms of noise?
• is the mixing implemented correctly? Is the value of C9 appropriate or maybe C9 is not needed at all?
• probably many more which I don't know yet 😱

Thanks a lot!

Frank


P.S. The TL072 part is basically taken from Dougla Self's book "Small Signal Audio Design"