Cavalier

I am looking for information or a schematic/circuit to convert 6VAC from my bicycle generator to 12VDC? Is this possible? I can read schematics and build electronics with no problem I just can't get my head around this one. Could someone please help me with this.... If someone helps me with this and I am able to provide some type of service for them I will be happy to, PCB Fabrication, PCB Layout design ect. Thanks....