Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
This is a picture of a Green Atom ignition module used on Brigs engines. They are not my pictures & the person I got them from did not check any values. But the construction & transistors are the same as a Red module. Personaly I would build the Red module & just try it on a Brigs engine.
The transistor is marked A3 & has a Texas instruments symbol on it. So it was probably custom made & there order would have been in the thousands at the time. It has taken me several years to find a suitable transistor. Some of the criteria was suitable Gain, Current & voltage rating & it had to be a Darlington transistor. The MOSORB was added as a Wipac coil on Seagull outboards was very destructive to these modules & the Transistor.
You wouldnt think it was so hard to do! You have done well to find replacements, I have a very old outboard on my little boat (Honda 75 engine). I might go take a look at it, although it needs alot of work before it sees water again!
Once I have a driving license I might have an incentive to get the boat finished .
I have several Seagulls, This is a pic of the Modified 40+ with a Wipac ign used for bench testing of modules before seting them in resin. I use an electric drill to drive it. Also a module temporay fixed to a 5HP Tohatsu for sea trials.
Nice motor I have one more question and its about the bc337 on your module its hard to see how its soldered to the tranistor are all three soldered to each of pins of transistor? and which way does bc337 go?