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Hey Bluejets, please dont think Im being defiant, Im just trying to understand the reasons for why my Hall sensor is working in the absence of a resistor and LED and in response to you saying "simply just won't work". Do you think back EMF from the reed coil could be an issue for the Hall...

But Im using a bare bones Hall sensor with no pull-up resistor or LED across the Hall pins and it works fine?

During my experiments I found leaving the 0.1 cap on the base leg of the transistor caused the spark to break down at an earlier rpm. The cap gives a short pulse but at high rpm this is not allowing the reed coil time to saturate. Removing the cap I can push past 18,000 sparks per min! The...

Hi Bluejets, still makes me think we need to test some other units on your set up. To see why your CDI works on your original circuit and why others dont. If you plug one of my spare CDI into your set up and it works I will faint!!! If you email me your addy I'll be happy to send you a couple...

Here are some pictures of the completed item. Re potting the extra component added about 6 mm to the over all thickness of the CDI. FYI the potting mix is just some regular epoxy resin mixed with about 4% acrylic house paint :) I pushed the terminal locking tabs in then using a heat gun...

Tachometer and Kill switch. Using an electronic tachometer I connected the tach input to the trigger terminal on the CDI. This is the same terminal the booster induction coil is on. The kill switch I ground the same wire. Seems to work fine in tests.

Well done

Hall sensor is the same as most any used here on the forums for all ignitions. 3144 but Ive used several others. The Hall signal wire just goes to ground when the magnet is near and goes open when is not. There is no pull-up resistor used on my Hall sensor. The LED you see in my video is...

Here's a video of the set up and it running. (as of writing the video was still uploading)

Success! (In a round about sort of way). So I was using the coil ripped out of an old 24 volt relay as an induction coil for the CDI trigger by passing a magnet passed the induction coil and inducing the desired spike (emf) which the SCR is looking for to trigger, and of course worked like a...

Claudio, unfortunately I dont have the inner workings of the CDI, it is of course ebay Chinese and god knows what they have inside them and Im sure like any budget manufacturer they will alter the design to suit their parts inventory and although the packaging looks the same and serves the same...

Claudio, See the attached pic, I followed your schematic . All the resistors shown are 1k. I temporarily used a grounded LED to test the cathode leg of the transistor and with each pass of the magnet over the hall sensor, sure enough the LED gave a "pulse". But still no spark! I have two...

I’d imagine the trigger voltage produced by the original pick coil would be quite high. Is it possible that the 12 volt circuit here is too low in voltage to trigger? I speculate that perhaps Bluejets CDI maybe designed differently that mine, the Chinese will keep changing designs to make...

Before the LED I did try the pull up resistor across the hall sensor +ve and signal out and made no difference. But I will try your schematic and remove the LED across the transistor too and do the other things as well. thanks

I tried all the above in various stages all the way up to all suggestion being implemented. I replaced the PNP BC558 transistor to be sure. I learned how to test it and it seems to do what its supposed to. I added a 1k resistor across the +ve and switch wire then added an LED to the Hall...

Hi, I just checked the cap it is correct, 0.1uF the paper work also reflects the same. I'll try the pull up resistor across the +ve and the signal wire of the hall sensor and see if that helps.

No its not a KY-003, its just a raw hall sensor potted in a plastic case. When the magnet is near the signal wire goes to earth. When the magnet is away the signal wire goes open. It has no resistor or LED like the KY-003.

Oh so the resistor on the KY-003 is a pull up? Its role is important in the circuit and is not just for the LED?

G'day Ray, Bluejets circuit is designed to allow a Hall sensor to take the place of an induction coil for triggering the DC 12 volt CDI. So the small Hall driven interface has to emulate a"sine wave" as a opposed to the Hall sensors square wave, right?