Hi peter,
Quote:
That wouldn't pose a problem to a transformer providing the transformer is rated to a lower frequency and higher voltage than the maximum voltage and highest frequency output from the turbine. The reason is because the voltage drops as the frequency drops so core saturation wouldn't be a problem. For example, if the output is 120V at 60Hz at full speed then the 60V at 30Hz produced at half speed won't damage the transformer
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To use a step down transformer when the input is say 120Vac, it would have to be say, 12:1 to have about 10Vac on the seconadry, before rectification and regulation, to charge a 6V battery.
If the wind speed dropped and the output was 60Vac, thru a 12:1 it would have 5Vac on the secondary, and so on.............
What transfomer did you have in mind ??? The OP is talking 50 mAmps, the charger has to be efficient as possible.
Peter search this site for a suitables switcher design: its interactive.
**broken link removed**