>Does a switch mode power supply also dump the excess voltage as heat?

Some of it. The "efficiency" rating tells you how much. I think PCA said the switching supply was around 95% efficient, meaning that 5% of the power drawn would not go to power the empeg, but would be lost as heat instead.

For the 5V supply, that could mean (13V x 1A = 13W x 5% = small number.

Cheers


Edited by mlord (24/08/2003 05:47)