Quote Originally Posted by rsocor01 View Post
For power design (buildings), 80% is a safe maximum number. Now, for small transformers I don't know what the percentage is.

Robert
The transformer power rating is with a resistive load. If you use diodes and a capacitor to make DC then the transformer should be de-rated to 50%. Because of the diode/capacitor, current only flows near the peak of the sign wave. The current only flows for about 20% of the time and is 5x larger than with a resistive load.