I just happened to receive an LEV200 in the mail today, coil measures 10.7 ohms according to my Fluke*. So the ideal resistor value bumps up to 3.05 ohms for this one. (Dang all I have in 3 ohm are expensive "non-inductive" resistors I was saving for a speaker crossover, have to hit the junk shop next week.)
* (Fluke also says that the battery that was in it was down to 5 volts! It was still working as a beeper, but the ohms setting produced negative 5 ohms when the leads were shorted, so the coil reading is with a fresh battery!) On Thu, Jun 27, 2013 at 6:03 AM, Lee Hart <[email protected]> wrote: > 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<http://www.sunrise-ev.com/LeesEVs.htm> > ______________________________**_________________ > UNSUBSCRIBE: > http://www.evdl.org/help/**index.html#usub<http://www.evdl.org/help/index.html#usub> > http://lists.evdl.org/**listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> > For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/* > *group/NEDRA <http://groups.yahoo.com/group/NEDRA>) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130629/afb9200c/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
