ttray321 said:If I use this circuit, I may try only one diode.
EC8010 said:
No, for safety you must use two diodes back to back in parallel, and high current ones at that. A cheap convenient source of high current diodes is a 35A bridge rectifier...
Incidentally, I believe the diagram in the earlier post has an error in it; the lower AC terminal of the bridge rectifier should connect to the same point as the upper AC terminal (ie, the negative side of the upper DC supply).