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Re: Lighting questions
On Sat, 8 Aug 1998, Huw Powell wrote:
> > Hella suggests relays with resistors and diodes on the control circuit
> > to avoid voltage spikes up to 500 volts produced by the relay closing.
> > I noticed the resistor and diode are on the control side. So now my
> > relays will blow my brittle headlight switch, I can't win! ;)
> If that's happening, what about all the other relays in the car? That
> "spike" must be very short lived, generated by the relays coil. Not
> many electrons...
In testing relays while debugging some of our transformer designs at my
father's company, we came across a similar situation. Looks like a
inductive kick-back possibly from the relay coils -- but, what we saw was
a current spike in the neighborhood of 3x to 10x rated latching current --
but we weren't looking for anything else. Blew out our circuit breakers
too often! Strange ... YMMV.
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