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'[EE] 2 Stroke Ignition Module circuit diagram'
2006\01\19@170202 by Richard Prosser

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Does anyone have a simple schematic for the ignition module used in
place of contact points on 2 stroke (magneto) engines?

If I have to I can buy a generic one for about $NZ20 but they appear
to be so simple that I should be able to knock one up out of junk
parts. Unfortunately the one I am wanting to replace is buried in
epoxy so it is unlikely to be fixable or easily reverse
engineered..It's combined in a module with the magneto coils but I
think I can separate it out OK.

Richard Prosser

2006\01\20@093001 by Danny Sauer

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Richard wrote regarding '[EE] 2 Stroke Ignition Module circuit diagram' on Thu, Jan 19 at 16:05:
> Does anyone have a simple schematic for the ignition module used in
> place of contact points on 2 stroke (magneto) engines?

No, but if you look at how a mechanicl ignition works, you just have
a lump on a shaft that opens and closes the points.  With electonic
ignition the lump is replaced with some kind of magnetic sensor that
genrates a pulse once per hump, and an electronic switch that turns on
and off in place of the mechanical points/switch.

I'd imagine there are examples somewhere of how to use a hall-effect
switch to control power to an inductor through a transistor. :)  Maybe
look around the DIY-EFI - http://www.diy-efi.org/ - and megasquirt -
http://www.megasquirt.info/ - sites.

--Danny

2006\01\20@111814 by GlennM

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> -----Original Message-----
> From: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu
> [.....piclist-bouncesKILLspamspam@spam@mit.edu] On Behalf Of Richard Prosser
> Sent: Thursday, January 19, 2006 2:02 PM
> To: piclistspamKILLspammit.edu
> Subject: [EE] 2 Stroke Ignition Module circuit diagram
>
> Does anyone have a simple schematic for the ignition module
> used in place of contact points on 2 stroke (magneto) engines?
>

I recall seeing an app note for a CDI ignition at the ON Semiconductor site.
I don't have the reference handy, but I'm about 95% sure that's where it
was. Search there. That will give you the basic layout of the charge and
trigger components.

If you don't find the app note, ping me offline and I'll dig it out of my
archive. I'm sure I saved it...somewhere.

Regards,
Glenn Minch

2006\01\20@144737 by Peter

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On Fri, 20 Jan 2006, Danny Sauer wrote:

> I'd imagine there are examples somewhere of how to use a hall-effect
> switch to control power to an inductor through a transistor. :)  Maybe
> look around the DIY-EFI - http://www.diy-efi.org/ - and megasquirt -
> http://www.megasquirt.info/ - sites.

Most low cost magneto style electronic ignitions do not use a hall
switch they use dI/dt sign change to cut the current circuit at the
right moment. This can be achieved with something as simple as one
transistor and two coils but usually there is more to it. Take a look at
the simple circuits required to make a battery powered 'pendulum' toy.
The ignition electronics work almost the same. Here is a circuit that
may provide some ideas:

http://www.geocities.com/~uwezi/electronics/projects/pendulum.html

To use as a magneto replace the battery with the primary of an ignition
coil and use a hefty magnet. The polarity of L1 may have to be reversed
and something better used for Q (MOSFET should work).

Peter

2006\01\20@152109 by Danny Sauer

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Peter wrote regarding 'Re: [EE] 2 Stroke Ignition Module circuit diagram' on Fri, Jan 20 at 13:50:
> On Fri, 20 Jan 2006, Danny Sauer wrote:
> > I'd imagine there are examples somewhere of how to use a hall-effect
> > switch to control power to an inductor through a transistor. :)  Maybe
[...]
> Most low cost magneto style electronic ignitions do not use a hall
> switch they use dI/dt sign change to cut the current circuit at the
[...]

Doh - I missed the magneto part.  I saw "small engine" and immediately
assumed it worked like my lawn mower. :)

--Danny

2006\01\21@010411 by Richard Prosser

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Thanks, yes that's the principle I'm looking for
RP

On 21/01/06, Peter <.....plpKILLspamspam.....actcom.co.il> wrote:
{Quote hidden}

> -

2006\01\21@120136 by GlennM

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I would like to know what you come up with. I have a moribund Kawasaki
KX-175 (rotary valve) that is in need of ignition love. When you have a
schematic please post it.

Glenn Minch

> -----Original Message-----
> From: EraseMEpiclist-bouncesspam_OUTspamTakeThisOuTmit.edu
> [piclist-bouncesspamspam_OUTmit.edu] On Behalf Of Danny Sauer
=

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