Capacitive Discharge Ignition (CDI) unit for KLX250S - Electronic Circuits Projects Diagrams Free

mooredan · 25th March 2008, 05:52 AM

Hi all,

I'm new to the forum and posted in the general chit-chat area for tips on winding a transformer.

My project underway is a CDI unit for a Kawasaki KLX250S motorcycle:

I do have a working prototype, but it far from being perfected. Here's a YouTube video of the design in operation:
http://www.youtube.com/watch?v=3dJ0AHexQ8c

I have an abbreviated log of my work here: CDI Project

It is a PIC-based design. One problem that I'm currently trying to tackle is my DC-DC converter section isn't powerful enough to fully charge the capacitor at RPMs greater than 6000-7000 RPM, which results in a weak spark. So I'm looking at an alternative design for the DC-DC converter.

The design I'm going to try utilizes a TI TL494 Pulse Width-Modulation Control circuit and a custom-wound transformer set up in a push-pull configuration.

This will be the first transformer I ever wind so any tips would be certainly welcome.

Thanks.
Dan

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25th March 2008, 05:52 AM	(permalink)
mooredan	Capacitive Discharge Ignition (CDI) unit for KLX250S Hi all, I'm new to the forum and posted in the general chit-chat area for tips on winding a transformer. My project underway is a CDI unit for a Kawasaki KLX250S motorcycle: I do have a working prototype, but it far from being perfected. Here's a YouTube video of the design in operation: http://www.youtube.com/watch?v=3dJ0AHexQ8c I have an abbreviated log of my work here: CDI Project It is a PIC-based design. One problem that I'm currently trying to tackle is my DC-DC converter section isn't powerful enough to fully charge the capacitor at RPMs greater than 6000-7000 RPM, which results in a weak spark. So I'm looking at an alternative design for the DC-DC converter. The design I'm going to try utilizes a TI TL494 Pulse Width-Modulation Control circuit and a custom-wound transformer set up in a push-pull configuration. This will be the first transformer I ever wind so any tips would be certainly welcome. Thanks. Dan