[sdiy] Ferrite Beads

[stew]

I've been planning a new system and have been putting 10 way boxed IDC headers on the last few PCB's I've designed so I can use 10 way ribbon cables for power. I'd have two wires for analog ground, and two wires for digital ground. These will plug into a distribution board with no more than about 10 modules hanging off it, and no daisy chaining. Am I asking for trouble here using that wire size? I think they are .12mm.

Regards,
Stewart.



> Ian Fritz <ijfritz at comcast.net> wrote:
> 
> At 02:14 PM 2/3/2011, David G. Dixon wrote:
> 
> >My panels are grounded at a single point (typically to one of the jack
> >rings) taken from the PCB.  Modules are all connected separately to the
> >power supply ground in a "star ground" configuration, but this is 
> defeated
> >as soon as anything is plugged into anything else, because then the two
> >panels are connected through the cable shielding, so I must have ground
> >loops all over the place.  Doesn't matter!  I also mount all of my 
> boards on
> >grounded metallic stooge brackets which cover the entire copper side of 
> the
> >board, so this might provide some extra noise insulation.  Otherwise, 
> it's
> >just dumb luck.
> 
> Ground loops don't hurt you if all the ground resistances are zero.  :-)
> 
> IOW, if you have star-type power distribution with nice heavy gauge 
> wires 
> then cross talk should be minimal.
> 
> Beads will help with high-speed (digital) hash, if that is a problem.  
> My 
> TZ VCO has a bunch of beads and subregulated supplies to try to prevent 
> syncing to the FM input signal.  It wasn't easy but I eventually got rid 
> of 
> the on-board x-talk difficulties.
> 
> Ian 
> 
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