Weird sound from switching transformer; Audio attached, TL494

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MacIntoshCZ

Joined Sep 4, 2019
22
Hello,
does anyone know how to eliminate weird that comes probably from vibrating cores?
It appears only when voltage / current is limited (and gap between pulses are big enough)
I need to lower duty cycle to have more pulses with lower gap.
Thanks very much for hints =)
*attached print from scope is sensed on current transformer
 

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