Connecting two transformers of equal rating to recharge a battery
If what you are saying is that your transformers are each rated at 12V (with a center tap) @ 0.5A, you can put a full-wave rectifier on just one of them and pull 1A @ 6V from the output. The average current through each half of the secondary won't exceed the 0.5A rating.







simulate this circuit &ndash; Schematic created using CircuitLab