Isolation transformers...

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br1nkLT

I need a 1:1 isolation transformer and was curious if that could be achieved by using two similar 12v transformers with the secondary’s connected to each other?
 
Yes. But it would not finish up being exactly 1 : 1. It would probably be something like 1: 0.9 which would probably be OK if it is just for safety when repairing things.
 
But it would not finish up being exactly 1 : 1. It would probably be something like 1: 0.9
Why do you say that?
If the output is unloaded, then with identical transformers, it should be very close to 1:1.

The voltage will decrease with load, of course, and the load should probably be no more than about 50% of the transformer VA rating for a tolerable voltage drop.
 
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