[sdiy] Transistor buffer stage with differential output

[Rönnberg Niklas]

Hi,

I'm planning a trip to the desert near the mountains on the border between
Argentina and Chile. There I will help some students with their master
thesis, to rebuild an old Indian city using modern VR-techniques. One thing
I'm going to do is to record sounds in the environment, so the final show
will be more alive than just images.

My idea is to use four of these microphones:
http://www.elfa.se/elfa/produkter/se/2013813.htm

I will place them in each direction and record surround sound. Using this
technique I can use all four microphones to record A B stereo, X-Y stereo,
Blumlein and so on...

The rather simple microphone I'm planning to use, uses up to +10V power
supply and I'm going to go for +9V so I can use regular batteries. 

I also want to have balanced cables... Does anyone have any schematic or a
suggestion how to make a good balanced output from these microphones? I
know that some microphones have a transistor output instead of expensive
transformers, but how do I do a good transistor buffer stage with
differential output? Can anyone help me out?

Best regards, and have pleasant weekend!

/Niklas