I've been reading up on isolation transformers and was wondering if I can set one up. This question is somewhat related to  but without the centre-tap.
I have two 230V->12V AC transformers. Having read , I understand that I can have the incoming mains go into the first transformer, and have the secondary part be connected to the second transformer's secondary. Then the second transformer's 'primary' is connected to the unit in question.
In theory, I feel that it should work. However, while the transformers have the label of '230V' on the primary and '12VAC' on the secondary, I don't know the current rating. Also the size of the two transformers are different. I salvaged them from an old lighting system at work which powered a series of halogen 'spotlights' (the small round halogen lights that shines downwards... I don't know the right terminology for this).
Is this do-able?