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Lighting and Electrical Things that go ZOT! Ignition components, batteries, lighting and accessories

View Poll Results: Are You Going to Roll Your Own CDI?
No, too complicated and difficult. 27 24.77%
Yes, but only one, for my own MB. 36 33.03%
Yes, a few for my own use. 37 33.94%
Yes, many, I'm gonna sell 'em! 9 8.26%
Voters: 109. You may not vote on this poll

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  #631  
Old 03-10-2016, 01:47 AM
thecoolsundar thecoolsundar is offline
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Join Date: Mar 2016
Location: Bangalore, India
Posts: 2
Default Re: Roll Your Own CDI

Has anyone disassembled the rotor? I'm curious as to what kind of magnets they use and how the laminated stack looks on the inside
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  #632  
Old 04-07-2016, 03:38 AM
Ahmedy's Avatar
Ahmedy Ahmedy is offline
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Join Date: Nov 2015
Location: South Africa
Posts: 20
Default Re: Roll Your Own CDI

Hi guys. I've got a problem. I've built Rohmell's cdi twice now and I tried building the jag one also. I'm not getting spark from either. Then when I hook up the original Cdi it works with no problem. Could it be the Chinese coil I'm using or could it be that the original stator coil isn't producing enough volts.
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  #633  
Old 09-08-2016, 03:09 PM
nyemi nyemi is offline
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Join Date: Feb 2014
Location: Hungary
Posts: 3
Default Re: Roll Your Own CDI

Welcome everyone.
Circuit your opinion?
Resistance(P1) to change the ignition timing.
Your test circuit.

Regards nyemi


Postscript:I optimize circuit.Sorry.
Attached Images
File Type: jpg Single coil CDI..jpg (82.0 KB, 23 views)

Last edited by nyemi; 09-13-2016 at 04:47 AM.
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  #634  
Old 11-17-2016, 01:22 PM
humanj humanj is offline
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Join Date: Nov 2016
Location: George
Posts: 2
Default Re: Roll Your Own CDI

Hi Rohmell

Please help me out, I noticed in the first circuit you posted a 33 Ohm resitor was present. The later circuits it is not present. At first I tried the circuit with the 33 Ohm resitor but no spark. Eventually I came right after removing it. Is the purpose of this resistor the limiting of current on the Gate Resitors?

I must say this circuit performs very well givven its simplicity. I used a Yamaha Generator Ignition Coil.

Thanks for your effort!!
Attached Images
File Type: jpg CDI 2 (1).jpg (22.4 KB, 8 views)
File Type: jpg ROHMELL CDI schem.jpg (15.9 KB, 9 views)
File Type: jpg Capture.JPG (189.8 KB, 6 views)
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  #635  
Old 11-17-2016, 01:41 PM
humanj humanj is offline
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Join Date: Nov 2016
Location: George
Posts: 2
Default Re: Roll Your Own CDI

Hi Toad

You can use a Yamaha Generator coil -- Yamaha High Voltage Set ET950 -- Works well.

In the orginal Circuit you added another capacitor but you did not include the capacitance value. I would also like to experiment, please supply the vallue.

The orginal circuit works well I must say.
Attached Images
File Type: jpg cdi mod.jpg (17.3 KB, 11 views)
File Type: jpg coil.JPG (30.1 KB, 6 views)
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  #636  
Old 01-26-2017, 05:47 PM
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rohmell rohmell is offline
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Join Date: Jun 2010
Location: New York
Posts: 1,534
Default Re: Roll Your Own CDI

Another CDI schematic.

Single coil CDI..jpg
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  #637  
Old 02-01-2017, 12:56 AM
nyemi nyemi is offline
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Join Date: Feb 2014
Location: Hungary
Posts: 3
Default Re: Roll Your Own CDI

Quote:
Originally Posted by rohmell View Post
Another CDI schematic.

Attachment 84786
Hi rohmell
Operation description, help:thyristor adjustable phase cutting.
Link:http://www.allaboutcircuits.com/text...rectifier-scr/
Factory-circuit revised ideas:
Attached Images
File Type: jpg egytekercses gyújtás.jpg (58.7 KB, 4 views)
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