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Regarding the use of MOV's (metal oxide varistors) to stop the arcing of
switch contacts which control solenoid coils, do they get mounted across
the coil terminals (as in the sketch Ed provided of alternatively using
flyback diodes) or the switch terminals?  Which works better (diodes vs
MOV) or are they about equal?  And how do you size the MOV's... there are
all sorts of specifications when I look in the catalogues for them, how do
I know which one is right for the task at hand?

  <Marv>