cdi tester

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01:51:04

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published 6 years ago

figgie

6 years ago

Does this work?

figgie

6 years ago

This on or the other or just concept?

faceblast

6 years ago

works fine. ignition coils are not magical. you put current through the primary coil, then stop it abruptly. a spark comes out the ignition lead towards the negative terminal. set up the ignition lead close to the negative terminal to make a spark gap

faceblast

6 years ago

all you need is something to switch current on and off abruptly and reliably. complex circuits aren't needed. you can even use a blinker circuit

faceblast

6 years ago

an old relay is the quickest and cheapest way to switch large currents for a quick test. it will thrash the contacts after an hour or so, but it's the simplest way to make a quick high power switch

figgie

6 years ago

Ah ok i see you have made a spark coil tester not cdi tester

faceblast

6 years ago

I test the coil with a similar circuit first to check the coils are ok. then I test the condenser and the coil with this. then I put them back on the ignition and crank it. if there's no spark then the ignition isnt firing

hurz

6 years ago

@figgie, its totaly unclear what you want to test. you came with a high voltage circuit, which is actually not needed to test the CDI modul. And you came with more circuits where you had a 555 running on about 5V but the CDI we have to guess is for a automotive environment 12V. So the interfaces from voltage level are already wrong. 5 to 12V does not fit. Also you never told us what you have in front of you and what you are trying to test. Which CDI nodul for which car? The information you have dropped here is lousy. Please clearify that or stop this it doesn't help anybody.

figgie

6 years ago

Hurz the ac cdi module is powered by an unregulated stator which generates around 350vac at 1amp. The trigger is a secondary pickup coil genrates volatages ranging from .5 to 12v ac depends on what the cdi needs to trigger. I had 3 different circuits i was working on i ended up going with the 555. Its for motorbikes and outboard. How is it lowsy i cant see how this schematic replicates that. From what i can see looks like a good coil tester

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