Thank you very much for your interest and time. Since I am interested in building these wind turbines in the easiest way (for anyone to be able to build for themselves too) I am using circuits that I find free on the internet. I use old parts taken out from old electronic circuits. If you have any idea to add or to make them better please do not hesitate to comment on my profile where you will find the photos and the circuit drawings.
Again thank you very much for your kind interest.