Gallery, Projects and General > The Design Shop

Newfangled ignition coils

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MrSleepy:
If you do decide to use a CDI type ignition coil you may find this site interesting..

http://www.sportdevices.com/ignition/ignition.htm#differences

It shows the basics of how the CDI system works..and how the coil is energised by a generated 300vDC..  through a capacitor.
The spark being produced by the firing of a thyristor and subsequent grounding of the primary(through the capacitor).
Which may require you to add a microcontroller to obtain the required timing accuracy.

Rob

geoff_p:
Many thanks to Rob for your link, which is most informative.

And to KRV: I worked out what you are saying and realise it exactly fits the motorcycle coils I have.

Where I had been trying to use these coils in 'the old-fashioned way' of interrupting a (DC) current through the primary, KRV's description makes total sense - a flywheel-magneto 'dumps' a short-duration, heavy current into the primary, which is of very low impedance.

It also makes sense of why my Thai motorcycle-repairman friend, who speaks almost no English, couldn't understand my problem - we were coming from diametrically opposed views, though we didn't realise it.

Again, thanks to all for your input.

Geoff

krv3000:
no problem geoff_p glad to hellp sos for me spelling   :nrocks:

geoff_p:
Well I tried Translate.Google.com for geordie first  :D, then I realised it was just spelling. 

Cheers,

Geoff

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