Hi, everyone, I have two 200w 12v ac lighting transformers, I would like to use those as power of amp board I'm building, but the amp board requires 12-0-12ac, the lighting transformer is 12-0 ac, and it's sealed, I can't make any mod on it. So I wondering if I can use two of it to make 12-0-12v ac? Thanks a lot for answering.

 

Lighting "transformers" are often not "normal" iron-core transformers but switch mode power supplies of various types which may or may not be compatible with what you want to do. A photo or two would be helpful.

 

Yes you can use two transformers as long as they are both the same Va rating, just wire the secondaries in series in the correct polarity, and use the junction as the CT.