Dynoreg 12 - A 20Amp Voltage and current regulator for the Lucas C40 (and other similar) positive earth dynamo.
These units are ideal for small wind and hydro, the C40 is suprisingly efficient and low speed.
Voltage regulation by PWM modulation of the field coils, reverse battery blocking diode so can be permanently connected to the battery.
I added variable current limit so it didnt overload the driving source, a small waterwheel
Flying leads supplied for connection to the dynamo but do remember its case is positive.. pretty sure you can modify to reverse this - we havnt done it yet.