I am doing a custom project, where I have to heat up a big resistor controlled by a PID and a thermistor.
Normally, I use a 12V 30A power supply, but I would like to design my own power supply, to learn how to do it.
Well, I am now choosing a simple transformer, and I find that they are pretty expensive. Maybe I am choosing the wrong transformer or the wrong provider (I am looking in Digikey).
So, I would like to ask:
For a European primary voltage and 12V secondary voltage, if I need 30A, I would need a 360VA transformer right? I see that many cheap power suppliers are cheaper than the transformer. Ok, those are optimized, but... cheaper than everything?
Which technology is best for this? I see many different types of power transformers, but I don't get the differences.
So, how would you look for a transformer for your own power supply?