It is really a doubt I have. They brought me an air plate with its corresponding sensors and display, and instead of the corresponding transformer, the owner gave me a magnetic transformer for dichroic (the model I think is TM-50A and something else; the label is quite erased), with which was testing the plate, although it is not correct. As I said, the problem was that after connecting the board, the voltage at the input dropped from 220 VAC to 30 VAC, which stopped the board. I did the test and the same thing happened. However, placing the correct transformer, I checked that the board works perfectly. But my question is, why does the voltage drop using this type of transformer? Do rectifier diodes have anything to do with it? Or can the transformer simply fail? It gives me the feeling that it also generates noise. And I would like to know if these dichroic magnetic transformers bring only a primary and a secondary, or something else, and what is the difference with electronic transformers.