Help! Recently saw a virtual coil calculator...

[Noahfence]

Can't remember where I saw it, but once you put in all the details it gave you a visual as to how it should look.
Thought I saved the page but I guess I didn't!

Does anybody know what this is called?

Thank you

 

[Susan~S]

Was it one of these?

Here are a few links for you regarding building coils and getting the resistance just where you want it:
1. Steam Engine
2. Coil Toy Calculator

 

[Noahfence]

That was it! Coil toy!

Thank you!!