I bought 2 center tapped transformers because I need to make 30V 2A center tapped transformer equivalent and I couldn't find anything with a 120V input.
So I got a 18V 2A center tapped transformer and a 12V 2A center tapped transformer.
How can I connect the secondary together so I get a 30V 2A center tapped transformer equivalent?
Best Answer
Basically you can't. If you connect the secondaries of your transformers in series, you will get 30V across them but the common connection will not be a center tap since one side will be at 18V and the other at 12V. If you got 2 of the 18V transformers, you would get a center tapped 36V transformer by connecting the secondaries in series. Two of the 12v transformers connected in series will give you a 24V center tapped transformer. You really need 2 15V transformers and they don't have to be center tapped. When you connect them in series, the common point becomes the center tap of the 30V transformer.