Chinese Kit CDI Reverse Engineering

[rohmell]

The purpose of this thread is to reverse engineer and duplicate the Chinese kit-supplied CDI module.
So far, we have determined:

[rohmell]

If anyone has a defective CDI, it would be great if you could try to open it up (I know, it's hard) and see if you can find any resistor values.

[Dirt Road Cowboy]

Well, I tried to chip my old one open, and it didn't come out pretty.

There is only one resistor, and I haven't been able to decipher any color code. That black stuff coats everything in there, and it cracked when I tried to chip the black stuff (epoxy?) off, so I couldn't get a reading with my ohm meter.

I will have to look closely with a bright light and magnifying glass to see if I can find any colors left.

This is what is on the PCB though:

1 resistor
1 capacitor
1 scr
4 diodes

Sorry, that really isn't much help.

[rohmell]

Does the PCB look like this?

[Dirt Road Cowboy]

Yes, that's the one.

[rohmell]

On your PCB, the first component looks to be a glass diode?

[Dirt Road Cowboy]

I think the first component is a black diode. The diode across the bottom of mine is a glass diode.

Black diode then resistor then black diode then another black diode then scr and the bottom diode is like the first one in the picture.
I believe the capacitor went to the scr and then to the coil, but I'm not positive since it broke off when I was trying to get it apart.

Sorry, I'm a bit rusty on my electronics. I haven't really done much electronic work in over 20 years.

[Wm Holden]

They dont use tubes anymore....

Just tryin to help!

[diceman2004]

this might be of interest
Make Your Own CDI

[rohmell]

Originally Posted by Wm Holden

They dont use tubes anymore....

Just tryin to help!

Microwave ovens still use a tube, a magnetron tube.