I was looking through some old threads and came across Martin's comparison of the mosfet rectifier circuit that yellow always recommends, and the various combinations of diode/capacitor circuits that Martin has published.
The boost cap seems to provide a significant advantage for getting the light output ramped up earlier, in a very simple circuit.
A drawback to the mosfet rectifier, is that it can't handle a cap in series immediately following it. But I was wondering if you could put a bipolar boost cap on the dynamo output before the mosfets, like a mosfet version of Martin's circuit 5, leaving out C1, and replacing the D1...D2 with the mosfets?
Could you for example put the C2 cap onto one of the dynamo leads before it goes into 1 or 2 in K1 in this circuit?
On a bottle dynamo, the dynamo frequency is high enough so that I haven't seen a need for the smoothing cap, and I thought it might be handy to get that .6v voltage drop back from the diode bridge. But of course, I have no idea if this would work or not.