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Re: camera flash sound

It's the leaves in the E + I type transformer core most likely. The
interesting bit is that as the cap. charges the current lessens.
Evidently the characteristic of the oscillator is that with less load
its freq. increases. Perhaps for the same reason as a gas tube
relaxation osc. does?

bc

light bulb fill. driven by AC in a mag field oscillates (or DC w/ ac mag
field) -- party bulb????

"Carl E. Mungan" wrote:

As a camera flash charges up, one hears a whirr of increasing pitch.
What causes this? Is there enough stray inductance to cause some
oscillation and hence mechanical stress via a magnetic interaction
(vaguely light-bulb filament style)?
--
Carl E. Mungan, Asst. Prof. of Physics 410-293-6680 (O) -3729 (F)
U.S. Naval Academy, Stop 9C, Annapolis, MD 21402-5026
mungan@usna.edu http://physics.usna.edu/physics/faculty/mungan/