piclist 2002\10\18\005937a >
Thread: Orienter w electromagnet ViBRATOR
www.piclist.com/techref/index.htm?key=orienter+electromagnet
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face BY : Russell McMahon email (remove spam text)



> > The typical way of fixing this is to put a zener in
> > (reverse) series with your diode, so that the coil
> > back-emf is clipped at (say) 30v. This fully protects
> > your driver semi provided it is rated at higher than 30v.

> Any idea how much current can be expected, rule-of-thumb ?
> I know u dont have the specs for the solenoid (nor do I), but
> say would it be more or less than it need to operate ?

The initial current is the coil current at turn off time and it decays from
there due to energy dissipation considerations.


       RM

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