Hi i am building A cdi unit designed for Yamaha dt125 but will be using it for my quadzilla ram r100 (2 stroke 100cc rev n go). I have taken apart the old cdi unit and looked at the circuit board and it matches the Yamaha dt125 circuit diagram.
My old cdi unit contains:
-transistor scr = t106m2 (still have it but taken off the board for replacement)
-diodes =1n4007 (taken off the board thrown away they cheap to buy, there was one odd one that had no writing on it maybe text rubbed off)
-capacitor = 400v 1uf (thrown away drilled through it)
-capacitor = labeled 153 (i think is 15nf 1000v)
-cap = 2.2uf 50v (thrown away drilled through it)
-resistors = 33k, 1k, 300r
But i be modifying the old circuit board with new parts from the diagram:
Circuit diagram is provided below:
Now my question??
1.what diode is the D2?
2. what alternative transistor can i use apart from 2p4M?
i am desperate to get the quad started but 40 quid a cdi unit i rather build one. I will be hopefully reporting back if it works or not.