transformer question


diyAudio Moderator Emeritus
2002-06-10 12:01 pm
As long as they are truly identical, then it's acceptable to connect all secondary leads in parallel.

A better way might be to connect each transformer for 12v 6a (by paralleling secondary) and connect these in series. This would also be acceptable for non-identical transformers.

Remember there is no +ve or -ve as we are dealing with AC here. It's phase that matters;)


Paid Member
2002-01-15 12:57 am
Tyrone Ga. U.S.A.
No. 2 12v 3a transformers in parallel will be 12v 6a
2 12v 3a in seriese will be 24v 3a

It may be helpful to add the term VA. VA or volt amp is
the amount of power . For a 12v 3a transformer this works
out to 12v x 3a = 36va . So when you add 2 12v 3a transformers
in parelle you get 12v X 6a or 72va 36va from each transformer.

Now if you use a full wave bridge rectifier and 2 capacitors
with 2 seriese connected 12v 3a transformers you can come
up with ~ +15v = and ~ -15v. But the amp rating of the 15v
supplies will be a lot less than 3a.