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Author Topic: 6400 Dolmar  (Read 2795 times)

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Offline aclarke

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Re: 6400 Dolmar
« Reply #40 on: February 10, 2014, 08:50:51 am »
3000,  i dont get that part of the Darlington coil either< gonna study it more
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Offline 3000 FPS

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Re: 6400 Dolmar
« Reply #41 on: February 10, 2014, 10:50:56 am »
Ok I was looking at the diagram for the magnetic field shown in the explanation and it shows the current reversing direction thru the trigger coil thus producing a negative voltage instead of a positive voltage.    That would then reverse bias the darlington and turn it off and collapse the field in the primary and inducing a voltage into the secondary.  Spark away.
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Offline 660magnum

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Re: 6400 Dolmar
« Reply #42 on: February 10, 2014, 11:35:48 am »
+1

There's a pretty good explanation of both a points system as well as a SIM and a more simple electronic ignition system in one of the Stihl service manuals
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Offline aclarke

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Re: 6400 Dolmar
« Reply #43 on: February 10, 2014, 11:38:08 am »
Ok, Transistors take the place of the points. Solid state...
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Offline 3000 FPS

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Re: 6400 Dolmar
« Reply #44 on: February 10, 2014, 12:58:10 pm »
I did not realize there were so many different designs to do the same thing.

The first one uses a darling transistor with a trigger coil to control the spark.
The second one uses two transistors along with a Zener diode to control the spark.
The third one uses a SCR, they call it a thyristor and a trigger coil to controll the spark. 
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Offline Cut4fun

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Re: 6400 Dolmar
« Reply #45 on: February 10, 2014, 01:04:39 pm »
I searched till I gave up. Nice find Jim WTG and Thank You.  8)

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Offline aclarke

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Re: 6400 Dolmar
« Reply #46 on: February 10, 2014, 01:09:13 pm »
Yep, searched for hours to no avail!!!

Any idea on what trigger type a standard coil uses? Adam
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Offline 3000 FPS

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Re: 6400 Dolmar
« Reply #47 on: February 10, 2014, 01:28:01 pm »
I have no idea myself.

The first one which was a Briggs magnetron looked like it was one piece with trigger and coil all being one part.
The second one which was a Bosch was two piece one being the trigger circuit and the other the coil.
The third was a Sem and was all one piece where the trigger and coil is all one part.
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Offline farmboy

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Re: 6400 Dolmar
« Reply #48 on: February 11, 2014, 08:14:24 am »
EHP says he just slots the mounting holes on 272 coil instead of swapping the cores.
Shep
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Offline 660magnum

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Re: 6400 Dolmar
« Reply #49 on: February 11, 2014, 09:14:13 am »
The Stihl SEM coils are advancing coils if anyone is interested in such technology?
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