This Linear Technology circuit charges a battery from the energy produced by a wind generator that can be a 12 V dynamo driven by a propeller. FET admits equivalent.
This circuit is based on a 5 V LED flasher. We found it in October 1980 Radio Electronics...
With this system you can disconnect phone lines in case of need for protection. The circuit is...
This circuit was found in a Popular Electronics from the 90s. The circuit has 4 frequency ranges...