Ferrite Core Audio Transformer

Transformer types - Wikipedia

https://en.wikipedia.org/wiki/Transformer_types#:~:text=Ferrite-core%20transformers%20are%20widely%20used%20in%20%28intermediate%20frequency%29,for%20stability%20and%20to%20reduce%20interference.%20Audio%20transformer

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Ferrite cores for audio transformers? | GroupDIY Audio Forum

https://groupdiy.com/threads/ferrite-cores-for-audio-transformers.4872/

> Can ferrite cores be used for audio transformers? Of course. Historically, ferrites gave much too low inductance for good bass response with low winding resistance. Sort of halfway between air and iron. But there is a LOT of research for switcher power supplies which need extremely low copper and core loss.

Data on Ferrite Transformers - OnAllBands

https://www.onallbands.com/data-on-ferrite-transformers/

It’s more difficult to obtain high coupling coefficients in radio frequency transformers, but a ferrite core based design offers the prospect of high coupling coefficient devices. One definition of coefficient of coupling, k, is: Where Lp and Ls are the primary and secondary winding inductances and M is the “mutual inductance.”

Everything You Wanted to Know About Ferrite Core …

https://www.customcoils.com/blog/everything-you-wanted-to-know-about-ferrite-core-transformers/

What is the low frequency limit for ferrite cores in audio ...

https://electronics.stackexchange.com/questions/117281/what-is-the-low-frequency-limit-for-ferrite-cores-in-audio-applications

There is no low frequency limit - I'm running 6.0 Hz through a ferrite transformer in order to provide signal isolation to a circuit. I can run it all the way up to 50 kHz too and, there is no change in amplitude. What I have to be aware of is the low magnetization inductance that a hundred turns on an RM12 pot core produces.