If the AC voltage of my oscillating coil is 30% higher than the rectified DC, how would I get closer to the AC voltage? Is it just a switching/frequency limitation and will schottky diodes perform better?

switching diodes work better than traditional diodes. I don't know about Shotky diodes, I never had the chance to work with them - I usualy prefer vacuum tubes in this situations - but rectifying diodes from switching power supplies will do their job and never get hot. In the power supply modules from PC computers, there are some diodes with three connectors (common anode I think) which have the maximum of around 50 volts and around 20 amps - at least this is what their datasheet say. They look like a big transistor. Those are the diodes you should try. If you use high-frequency switching diodes, they will never get hot as the traditional rectifying bridges - or the 1N4007. Romero did a great thing by connecting many diodes in parallel (or rectifying bridge with diodes in parallel) but there was a lot of loss due to the incorrect diode type. The problem with heat is the switching frequency - inapropriate for traditional diodes.

hi all
Shottky diodes work really well with backemf/recoil since it is really really fast reaction of the votlage spikes....however they dont make that high of voltage ones....for genrator coils, they dont make much difference.

Quote from: romerouk on May 09, 2011, 10:38:51 AM
I have lots of them, a big box full of S30D45CS ; SBL1640CT; STPS3045CW; STPR1620CT,SB3045ST; S20C10CC,....
I have tested those and performance was lower than existing ones 1n4001. Maybe they do work good but at higher frequency BUT not in my current setup.
Maybe someone can explain and help me decide what to use in the next setup.

Romero has tried those rectifiers from the power supplies. (S20C... are in fact Schottky rectifiers: http://html.alldatasheet.com/html-pdf/141510/MOSPEC/S20C40CE/217/1/S20C40CE.html) But they did not perform better in HIS setup. I am using 1N4007 in parallel to FWBR. But in fact he was using 1N4001.

I found out that it is possible to get every coil into self oscillation mode even without the rotor attached using his driver circuit. The hall sensor has to be placed somewhere near the coil, sometimes beneath, sometimes on top, depending on the inductance and the distance of the biasing magnets. It is important to have the right amount of magnets at the right distance under the coil and to match the direction of current flow through the coil. So if the connections are reversed it won't work. This works with a steel core as well. When driving with 15V I have the AC voltage between 40V and 60V. Unifilar connection seems to give higher voltage compared to bifilar.

So I still wonder if these high frequency oscillations are key. His statement from above indicates that this was not necessarily the case. I wish he had shown a scope shot of one of the driving coils too.

Hello here!

I see you all very busy about Bill's Dynamo

May I ask you if someone has achieved too, like RemeroUK, a COP 2.0, or at least > 1.0? I've read elsewhere that it was fake but I've seen the vids and I seen nothing wrong with his experiment :/ but any way, if someone else have done too, so that it was good, at least on the basics

So, could let me know about your own achievements here?

Cheers.