I have been following the CDI thread with great interest. I commend the diligence and persuit of the goal. The journey is a reward in itself, I understand.

Thing is I would like to make an ignition and actually fly it. Another hobby of mine is making radios from scratch so, I know not to grab the hot end of the soldering iron and how to read a schematic. I don't want to buy or wind a miniature coil. The computerized advance seems to be the stumbling block on the Gompy unit. It seems to me that for my level of electronics building experience a mechanical advance would be perfect. I see one company still uses them on their engines. I have found schematics for transistorized ignitions that use miniature coils and hall sensors. I want to take it to the next evolutinary level but not get into a programable advance.

Does anyone know where to find a schematic for making one that uses no coil? It needs to be something that is light enough to use in an airplane. I have hundreds of pounds of electronic compontents of all kinds. I am pretty sure I have what is needed in my "junk box".