Lee Hart wrote:
My suggestion would be to add a series resistor, with a capacitor in
parallel (called a "slugger" circuit)...
Mike Malmberg wrote:
--So a series resistor on positive or negative side of coil?
It doesn't matter. The resistor goes in series with either coil wire.
Without the resistor, you see 14v across the coil with it on. Choose the
resistance value so you get about 10v across the coil, and 4v across the
resistor.
Then, wire the capacitor across the resistor (not the coil). The
capacitor has a polarity; connect it so your meter shows a positive
voltage across it (with your meter red + lead on the capacitor +, and
the meter black - lead on the capacitor -).
The capacitor should be rated at about 10,000uF (the value is not
critical -- 2:1 either side of this is fine). It should be rated for
16vdc or more.
The Tyco data sheet doesn't tell me the coil resistance; you'll have to
measure it with your meter. Then the resistor value is about 4/14th of
the coil resistance. For example, if your coil measures 10 ohms, then
the resistor is 10ohms x 4 / 14 = 2.85 ohms. Again, it's not critical;
anything from 2 to 3.5 ohms will work. Since the coil draws about an
amp, the resistor needs to dissipate power; about (4v)^2 / R. If your
resistor is 4 ohms, that's 4^2 / 4 = 16 / 4 = 4 watts; so use a 10 watt
resistor.
If you can tell me the coil resistance, I can send you the parts. The
postage costs more than the parts do!
--
For every complex problem, there is a solution that is simple, obvious,
and wrong. -- H.L. Mencken
--
Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.htm
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