The Master Of Magnetics "Steven Mark"

[tishatang]

Hi all,

The resistance in the plug wires is to cut down radio interference when the plug fires.  In the early days of solid plug wires, if you had a buzz in your radio, you used resistor spark plugs.  They stopped using
resistor plugs when all the cars required high resistance carbon coated string instead of solid wire to the plugs.  The capacitor in the circuit is also to cut down radio interference from the sparks.

If the resistance is to high (too large a gap to fire) the coil will arc internally across its secondary winding, burning it out after a short time.

I have some 5 strand #26 litz wire I plan to wind many turns around so that it is at least 1/4 wavelength of 175K hertz.  I figure I can solder the ends together to add effective length.  This is to get the effect of standing waves ala a Tesla coil.

Somewhere I read about an old energizer design which had miles of wire on it.  I think it worked by switching it off before the the currant reached the end.  Something like Mannix's parable.  If I can find it, I will post the link.

Tishatang

[pese]

the wire resistance IS NOT NEED !

Car (Germany ) was up 1955 without any resistance ! (only insulated wires)
Some drivers , want to by special (additional) resistors, OR
Spark - Plugs with (build-in"resistor")
to DEGREASE , noise (trouble) in Car-AM-RADIOs.
Thats all .
Nothing "mystery"

D.P.

[bob.diroto]

Hi all,

I found a site which may help us visualise what happens when different waveforms combine. Opposite of an FFT on a waveform.

This is where all the java applets to run can be found:
http://www.educatorscorner.com/index.cgi?CONTENT_ID=2481

This one demonstrates how any complex waveform can be broken down into it's component sin waves of different phase AND different amplitude.
http://www.educatorscorner.com/index.cgi?CONTENT_ID=2487

Now imagine on the coils that instead of sine waves we applying pulses to each coil. Each waveform could have a different frequency and amplitude and possibly 90 phase change via a capacitor.

[bob.diroto]

Steven Has said that electron tubes were better,especially when first experimenting because of their ability to handle transients better than semiconductors . Can any body see the relevance of this?

Lindsay Mannix

At a guess, with semiconductor diode you're going to get reverse current if the transient is greated than the breakdown threshold of the diode. Whilst a rectifier electron tube will not have this problem ??

If all coils are commoned on one transformer and you're driving each coil with a different frequency square wave (especially if the square wave isn't well shaped) you're going to get transients ?

[bob.diroto]

Been having a discussion with gnostic on this one. Can we have votes (A,B or C) in as to what the likely arrangement is:

Steven says the coils are "one on top of the other" :

Would this be:

Version A
A horizontal cross section from the side would look like this, to my understanding.

c1c1c1c1c1c1xxxxxxxxxc1c1c1c1c1c1c1
c1c1c1c1c1c1xxxxxxxxxc1c1c1c1c1c1c1
c2c2c2c2c2c2xxxxxxxxxc2c2c2c2c2c2c2
c2c2c2c2c2c2xxxxxxxxxc2c2c2c2c2c2c2
c3c3c3c3c3c3xxxxxxxxxc3c3c3c3c3c3c3
c3c3c3c3c3c3xxxxxxxxxc3c3c3c3c3c3c3


Version B

c3c3c3c3c3c3xxxxxxxxxc3c3c3c3c3c3c3
c3c2c2c2c2c2xxxxxxxxxc2c2c2c2c2c2c3
c3c2c1c1c2c2xxxxxxxxxc2c2c1c1c2c2c3
c3c2c1c1c2c2xxxxxxxxxc2c2c1c1c2c2c3
c3c2c2c2c2c2xxxxxxxxxc2c2c2c2c2c2c3
c3c3c3c3c3c3xxxxxxxxxc3c3c3c3c3c3c3


Version C

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c3c3c2c2c1c1xxxxxxxxxc1c1c2c2c3c3
c3c3c2c2c1c1xxxxxxxxxc1c1c2c2c3c3
c3c3c2c2c1c1xxxxxxxxxc1c1c2c2c3c3
c3c3c2c2c1c1xxxxxxxxxc1c1c2c2c3c3
c3c3c2c2c1c1xxxxxxxxxc1c1c2c2c3c3