Op Amp Labs Transformers
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!!!!
** However, solenoids and relays have moving parts - transformers do not, so are normally bolted up tight and run silent.
Had a Chinese made guitar amp here that would suddenly made a loud hum if laid over on its back, standing upright it was OK.
The four bolts holding the power transformer laminations together were barely finger tight. Soon fixed.
..... Phil
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