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Posted: 18 May 2010 09:38 AM     [ Ignore ]  
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Posted: 02 June 2010 03:18 AM   [ # 1 ]     [ Ignore ]   [ # 1 ]  
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Joined  2010-06-02

Magnetostriction is (almost) never the source of noise in an inductor or transformer. Airgaps - also in the form of poorly assembled cores - are a common source, loose windings is another. And yes, I heard once a shielding vibrate. Capacitors sometimes make sounds. Quite unexpected. I heard it from a type-III ceramic one. But logical after all: it used BaTiO3 as a huge-K dielectric because it is ferromagnetic, and under polarisation it acts as a piezoelectric material and is commonly used in transducers. Type-I ceramic don’t do that, plastic capacitors neither. The get a hum from a 150kHz switching frequency, you must have something flawed in your circuit: typically an oscillating regulation - consistent with the bigger capacitor stabilizing it. And by the way, 150kHz is already huge, I wouldn’t go to 250kHz. The duty cycle can’t be 100% nor 90% in an inductor buck circuit with 24V and 3.3V; and even with a transformer, designers stop at <90% duty cycle so that the transistor always switches