just for a quick background i am a electronic engineering student and my father inlaw is a electronic engineer for the last 30 years. i dont like to bug him to much so instead of building a programable ignition a am going to build one out of semicoductors. i have a31cc ryobi engine that i am converting for a airplane. the homemade ignitions are not that great so i did some digging around and found that the off the shelf one are way to much money. ST semiconductor has three electronic ingnition controllers that have a lot of cool adjustal features. the three i am looking at are the L497, L482, L484. they use little outside parts and require a coil. i can mail anyone the pfd files if they leave there email. if anyone is interesed in helping out it would make this go a lot faster. i have all of the software to build the boards and inport and export different file types to sharing files will be very easy. i can either make the pcb's by my self or have a local company make them. cost for the final ignition will be around 6-10 bucks plus a coil (2-5 bucks used and all the way up for brand new one) and board will only cost 1-3bucks. i can make small amounts of boards for a few dollars each. if there are a lot of people we can have my made professionally for the same price. if any one has question please post them here so we can all keep track of where we are at. sorry fro my gramer and spelling. thanks