Is there a thing as a transformer toroidal coil?

Question

Is there a thing as a transformer toroidal coil and if there is, where can I get one?

Answer 1

Yes. They are the round counterparts to the more common square -shaped transformers. You can buy small examples at Radio Shack

Answer 2

Yes.

Here:

http://www.toroid-transformer.com/main.h...

http://stores.ebay.com/Antek-inc

They are generally more efficient than more conventional iron "E-I" core transformers but more labor-intensive to wind the core so they are more expensive.

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