Confusion about transformers, specifically planar ones and how they work?
I'm trying to eliminate the need for a large coil transformer (120V, 60hz, AC to AC). Now I know very little about transformers but I've been researching planar transformers (for their low profile nature and weight savings) however they only seem to come in AC to DC variants. All of the reading I do about transformers state that all they do is change voltage through inductance. Why and how does a planar transformer change incoming AC to DC with out a separate rectifier?