>
> >Do you have to be more concerned with EMI when you use a switching DC-DC
> >convert / regulator?
>
>Yes, you do; possible interference to sensitive circuits in your own
>device is always an issue, as are possible radiated and/or conducted
>emissions that could interfere with other devices.
>
>The LT1931 device you linked to below operates around a megahertz,
>which could cause a lot of interference with nearby radios.

True, up to a point.
If it's a 10 watt converter, then you're going to have 10 watts in
circulating AC, at the switching frequency, with edge rates out to 10X that
and more.
However, they can be built properly, with just some attention to where the
current is going.
If you do this, you can barely tell they are on, with a sensitive receiver.


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