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On Sunday, March 4, 2018 at 7:49:09 PM UTC-5, Phil Allison wrote:
wrote:

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I'm particularly interested in how badly they ring. What causes an audio
transformer to ring?


60Hz transformers hum,


** A lot of force comes from the 60Hz supply acting on anything magnetic with a bunch of wire wound around it. This is single, low frequency, forced vibration, not resonance.

You know, in AC solenoids a shorting ring is beneficial to keep 60 Hz buzzing to a minimum, as the shorting ring provides a CEMF!!!!


Jack



so at the right audio resonant frequency,
I guess the core could resonate and ring, physically!!

** The sort of ringing being referred to here happens at high audio and supersonic frequencies - needs test gear to see.

Folk fuss about it cos it indicates non flat response.


..... Phil