[sdiy] Ferrite Beads

[David G. Dixon]

> 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.

Every module is hooked to the power distro board with four 20-gauge stranded
wires: one for each rail, and two for ground.  So, yeah, I have a lot of
ground conductor to each module!

> 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.

Luckily, there will be no digital logic in my TZFM VCO beyond a (rather
slow) comparator and a JFET switch.  However, thanks for the heads-up about
the syncing difficulties.