Hello,

I need to power a circuit I made with the main's AC. This because I use it's frequency (50Hz in Europe) to clock my PIC. My circuit draws around 50mA (mainly due to the 7-Seg 4-Digit LED display).

Using a transformer is very easy but extremeley unefficient regarding space and power dissipation.

I've heard quite a lot about SMPS (Switching Mode Power Supplies).

There are lots of theoretical documents about this subject but, unfortunately, I couldn't find at least one electronic shema example about this.

Does anyone know where I could find this kind of information?