The question has come up regarding syncronising hyrdoelectric power station= s. I can see how a diesel fired station is controlled but I cant see how you could control a hydro powered turbine. I guess they generate ac and variable freq convert to dc and convert to ac.= ' However, the converts would have to handle a huge amount of power and perhaps not possible to build such a device. Any ideas. The web didn't want to play. Cheers Justin --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .