voodoo, I too am searching for ricks schematic to apply to a fan I have already modified. I need to grasp the basics of the scr and how it wires up correctly. I emailed him and despite being very busy he answered promptly. He said that the schematic would come with all the kits he sold, and that it was just another way to wire it up. He told me to go ahead and just do the 555 timer as it is just as if not more efficient.

So if anyone has a better understanding of the scr and its function I would be greatful, otherwise I will probably just move on and figure out a mechanical switching like Aarons with the copper tabs or step up and try and replicate the 555 timer.