I will share everything I come up with and where I am purchasing parts and which ones etc. I will also post pics of how to I build mine and video of running motor.
I think 2 modules can be built one for negative ground engines and one for positive ground engines which would make building them easier depending on the engine you use it on. I am still learning and testing.
The BD649 transistor I just built some with has to be insulated from engine ground to work on OMC Ken is saying the BU931 transistor doesn’t which means you would just ground it to the block.
Anything is possible so I think that insulating them is most likely the best way so they can be used on either/or type of engines by just reversing the wires. If it won’t spark reverse wires thats simple also.
After looking at Debes Pics of a Red Atom that was taken apart I didn’t see a heat sink only like a plastic case that folds around the electronics like a envelope.It looks like it is surrounded with plastic only no heat shield.
The test modules I just built I suspended the modules in mid air under flywheel using the a ground wire to coil to hold them in place . No heat sink is being used. I think if you attach transistor directly to the motor it might give it too much heat and kill the transistor early just my thoughts. With one insulated from the engine heat it might last longer just my humble opinion and I am testing my theory. A person could also screw a copper penny to the back of transistor if it isn’t touching motor to help pull heat from it.
I also wonder if building the module with the appropriate capacitor/condeser value in uf / mfd for the type coil in motor would help keep them alive or more responsive?? Might be nothing might be something. I think condenser values are related to the OEM coil used as these charts show. I will post the charts but different values are used for different coils. I used a similar value good quality capacitor in my build for my module I am using on my type engine coil. I think the .47uf might be a generic value which will work on most coils but might be a tad high for outboards just my humble opinion.
Hope that helps,
Joe
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