Synchro flash voltage reducer.

I need a simple circuit for voltage reduction of studio flash synchro cable in order to use it with my digital camera. The camera only work with 6 volts charge, higher voltage will burn the camera circuit, my flashes deliver from 20 to 80 volts in the syncro contact. I tried to buy the "Wein safe sync" device, but in southern Brazil this is imposible. Thanks for any help.