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=> Discussion Boards => General Discussion => Topic started by: DuctTapedGoat on May 26, 2011, 09:38:24 AM
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(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fwww.dragonfly75.com%2Fmotorbike%2Fimages%2FCDIboard%2B.jpg&hash=61537e009a82b4da58a257e8e1238dcd4e2881b7)
So, this is what I'm trying to disassemble with a pic. I can't see every component, and I would really appreciate some help in it.
It's a CDI for a motorized bike, and he wants 75 bucks for it. It's not patented, and I don't want to blow 75 bucks on something that's only 10 bucks in components. Anyone willing to help me diagram it out? It's simple enough, but some I just can't read.
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what is the function of this device? any more pictures?
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Short form, adjusts the spark on a 2 cycle motor.
Here's more info out here from the horses mouth. This isn't a picture I took keep in mind, it's one off his site under installation instructions. And it's the only one I can find.
http://www.dragonfly75.com/motorbike/CDI.html (http://www.dragonfly75.com/motorbike/CDI.html)
http://www.dragonfly75.com/motorbike/CDI2.html (http://www.dragonfly75.com/motorbike/CDI2.html)
http://www.dragonfly75.com/motorbike/CDIinstall2.html (http://www.dragonfly75.com/motorbike/CDIinstall2.html)
http://www.dragonfly75.com/motorbike/4curves.html (http://www.dragonfly75.com/motorbike/4curves.html)
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right so this is obviously not a PCB, just Veroboard/stripboard/whatever you wanna call it, the first thing is working out which way the copper goes
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I dont think this is stripboard i think its matrix board ( Like This (http://www.bitsbox.co.uk/images/hardware/padboard2.JPG) )
or one of those ones with pads in groups of 3 holes or some variation on this, which makes reversing it from the picture very difficult...
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I don't think so - the diode and resistor by jumper/header A almost looks like you can see the wire through it, that or it's a scratch, but I think it's just cheap bread board.
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Time to put this mofo into paint, it says the C106D is a thyristor, looking up the datasheet now
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I think your best option is maybe to buy one, reverse engineer it, then sell a couple to make your money back...
EDIT: Is this the same? (http://www.transmic.net/en/analog.htm)
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yeah, thats easiest, you dont know the values of somethings
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It's another CDI box - but should give enough similar values to be able to process of elimination it out, at least with the resistors.
I'm near tempted to, but 75 before shipping is a lot of money even to start it out with. Gotta register for college when I get paid, and getting all that rolling is going to eat into my check a bit.
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so the one i posted doesn't function the same?
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Nope - the xt600 was a 4 cycle motor, they fire completely different from a 2 cycle motor unfortunately. It functions relatively the same in that it's designed to discharge the capacitors in the coil to get spark, but with a different circuit sequence.
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I agree to just buy one and reverse it.
I did the same with a CFL bulb's internal PCB and breadboarded it just because I could and it was a cool idea.
Sir, i think you have yourself a bridge rectifier in there and a Logic-Level Thyristor SCR. :)
so when the voltage is switched positive it stays positive, when the voltage is switched negative it turns off.
I don't know much about small engines, but if that kinda makes a bit of sense of what the circuit can do. hyper's link (http://www.transmic.net/en/analog.htm) to explain the relationship of the stator and ignition systems show why this is important, just timing.
I guess that this circuit just fires a pulse to the spark plug when the alternator is at a certain point?
what do you guys think
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Exactly what it does. Essentially this one specifically is designed is to adjust the RPM's powerband as revolutions increase, and with a capacitor upgrade on the ignition coil, have a stronger spark.