Need help with finding the electronic schematics
When you click the "Specifications" tab on that anemometer page,
it specifically says


  Signal type:   low level AC sine wave, frequency linearly proportional to wind speed
  
  ... (more details about the output signal omitted) ...
  
  Magnet:    Indox 1, 25 mm (1 inch) diameter, 13 mm (0.5 inch) long, 4 poles
  
  Coil:  single coil, bobbin wound, 4100 turns of #40 wire, shielded for ESD protection


From those specs, it is almost certainly a fixed-coil, moving-magnet magneto -- a kind of alternator -- with the wires from the coil coming directly out.
It apparently doesn't have any other "electronics" or "circuits".

It has a coil of wire, and it has a magnet spinning in the center of that coil.
That's it.

They gave you details about each and every electronic part of the device -- both the coil, and the magnet.
I'm a little puzzled -- Why would anyone think "they give no info about it" when their website already lists almost everything there is to know about it?

Could you give a link to a web page about something you've designed, that shows the amount of detail you think is appropriate?



(Image from http://en.wikipedia.org/wiki/File:Alternator_1.svg ).