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Old 10th February 2008, 09:55 AM   #1
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Default transformer question

a newbie question, is it possible to combine/parallel two identical transformer to make a voltage/amperes higher?
like 2x 12v/3amp transformer combined to make 24v/6amp:
positive+positive negative+negative.

Last edited by abiedoodles; 23rd April 2012 at 10:06 PM.
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Old 10th February 2008, 10:40 AM   #2
dhaen is offline dhaen  Europe
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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
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Old 10th February 2008, 11:05 AM   #3
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Location: 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.
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Old 10th February 2008, 11:35 AM   #4
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thanks for the reply, i might use in gainclone as i have a bunch of this available.
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