Hi:



Using ferrite profiles, how problematic can be the coil to ferrite slack in the cylindrical part of the toroid?

Thanks
Martins

 

On the worry scale of 1 -> 10, it's a zero if it's just a little uneven like your example.

 

A toroid has higher permeability than air core coils, which means you need fewer windings. You can also build them with higher Q than air core coils.
sliding the turns close together or farther apart will have SOME effect, but much much less than you would have on an air wound core. A toroid core will give you more inductance stability. Like Mister nsaspook said in your example, don't worry about it.

 

Thank you.

 

A toroid has higher permeability than air core coils, which means you need fewer windings. You can also build them with higher Q than air core coils.
sliding the turns close together or farther apart will have SOME effect, but much much less than you would have on an air wound core. A toroid core will give you more inductance stability. Like Mister nsaspook said in your example, don't worry about it.

With good test equiipment you may be able to measure a bit of difference, and if you have a tuned circuit for an oscillator at 3.50 megahertz you may be able to shift the frequency 100hz or so. If that matters then an application of coil glue will keep the turns in place. 100Hz/3500,000Hz is a very small percentage of change.