Re: Re: Coil Question

Posted by Mark on February 16, 2004 at 13:06:18 from (199.46.199.232):

In Reply to: Re: Coil Question posted by Mark on February 16, 2004 at 06:18:42:

Peabody,

Now a purist will come along and say "dummy, that's the purpose of the condenser"................Trruueee. And, for things like automobiles with radio's it suppresses electrical noises that are present when things spark and currents get interrupted in magnetic circuits.

If the current that was charging the coil could be slowly altered and them stopped, when you are through charging and ready to smack the plugs, there would be no sharp rise in voltage across the opening points and hence no damage (primary circuit). The secondary (part going to the plugs)is still doing it's thing and has essentially done it before much changes in the primary. A condenser (capacitor in electronic jargon) is just the opposite of an inductor (coil) in that it sucks up inrushes of current and takes awhile to build up voltage.....neat. If I put a capacitor across the points, when they open, the capacitor would act like a slowly increasing resistance in the coil's discharge and if I select the right value, the voltage across it (while absorbing the current that the decaying field in the coil is generating) will rise slowly enough that it will be below the "flash" value of the points and aha mateees, there will be no spark and essentially no degredation of the points.

I left that out before because you have to eat this stuff a little at a time or it will overwhelm you . A little at a time and it's fun.

Mark

ps Another response to your post from Mr. Hall stated that they run 6v coils until they burn up and they pitch em. Well if you don't have adequate resistance in the primary circuit you can fry the coil too but you will know that well in advance if you monitor the temperature of the coil. If it is hot to the touch and the heat is not coming from the engine your resistor is too small and your coil is on the way out. I'd bet if Mr Hall measured the resistance in his primary circuit there wouldn't be any (so to speak...the wire resistance is there but it is slight)or it would be less than 2 ohms.

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• Re: Re: Re: Coil Question Seifdoggy2 19:27:21 02/17/04 (0)

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