On Wed, 25 Nov 2009 16:47:26 -0500, "Spehro Pefhany" said:

> 
> I think they use IGBTs to control the flash current (interrupt it before
> the
> photoflash cap is discharged too much). IGBTs are generally a more
> appropriate
> choice than MOSFETs in this kind of application.

That makes sense, then they could do all sorts of clever things, flash
several times for effects, etc.

It would take some interesting calculating of the on-time as the cap
voltage would be lower each flash. A monitoring photodiode might be an
easy cheat for that.

Thanks!

Cheers,

Bob

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