But AFAIK there IS no "low tension side of the magneto". The spark is
created when the magnet on the crankshaft passes by the stionary coil, which
results in the spark. Please correct me if I'm wrong, remember, this is a
small 2 stroke engine. Thanks, TTYL

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Richard Prosser
> Sent: Thursday, August 09, 2001 16:24
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: Building a Servo
>
>
> I think the suggestion was to put a relay across the points/sensor on the
> low tension side of the magneto.
>
> Richard P
>
>
>
>                     Herbert Graf
>                     <mailinglist@FA        To:     PICLIST@MITVMA.MIT.EDU
>                     RCITE.NET>             cc:
>                     Sent by: pic           Subject:     Re:
> [PIC]: Building a Servo
>                     microcontroller
>                     discussion list
>                     <PICLIST@MITVMA
>                     .MIT.EDU>
>
>
>                     10/08/01 08:16
>                     Please respond
>                     to pic
>                     microcontroller
>                     discussion list
>
>
>
>
>
>
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Douglas Butler
> > Sent: Thursday, August 09, 2001 15:50
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [PIC]: Building a Servo
> >
> >
> > >         I might also add a redundant kill switch with a
> > > second transmitter and
> > > receiver, the only problem, and this is something I was
> > > planning to ask, is
> > > how do you stop a gas engine remotely? I thought about
> > > disconnecting the
> > > spark plug but how would I do that considering the voltages involved?
> > > Cutting the fuel flow is a second idea but my experience with
> > > two stroke
> > > engines is that they keep running, without any fuel flow for
> > > at least 30
> > > seconds, long enough to cause damage. Anybody have a better
> > > idea? Thanks,
> >
> > How about some relay contacts across the breaker points for the ignition
> > coil, assuming you have mechanical points vs. electronic ignition?  The
> > voltages there are reasonable and without spark the engine should stop
> > quickly.
>
>         I was thinking about something like that but it may be
> hard to find
> a relay
> that can do it. The problem is that if the relay contacts aren't
> far enough
> apart a spark will simply develop across the relay contacts AND the plug!
> :( The motor I am using (and no I can't change the kind of motor being
> used!
> :) )uses a "coil flying by a magnet really quickly" approach to
> develop the
> spark.
>
> Why I don't really like this idea either is that assuming I find a relay
> with contacts far enough apart it is still possible that on say a
> humid day
> the spark WOULD jump across the contacts. I guess I could heavily modify a
> relay so the contacts are say 1cm apart, I believe that would be enough,
> but
> being a safety device I'd rather go with something a little more
> "sure". :)
> TTYL
>
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