> So, putting a ferrite bead in series with the power supply feeding some
> 'stuff', do they prevent noise on the supply lines from coming back to
> the source?  For instance, a DC/DC module feeds 3 circuits, each having
> a bead. If noise is injected back onto the supply from the devices, it
> would stand to reason the bead would help prevent it from being
> transferred to the other devices?  Correct? Comments?

To a point. However you probably want some other form of filter in this
position if you have serious problems with noise.

have a look at these application notes.

http://www.interpoint.com/technical/application.tem

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