Re: Testing timing of Red Atom Modules

[debe]

Hadnt thaught about reversing the wiring of the coil primary, but it seems to work. Using TIP102 & BD649 transistors the Mosorb or TVS will need to be a 1.5KE91 (clamps voltage spikes at around 90V) its a 90V 5W TVS, & this will get quite warm on some coils. This is required as the transistors are only VCEO 100V (Collector to Emitter breakdown voltage). It took me a long time to find a reliable transistor to handle the High voltage spikes on the primary windings of the ign coils. The 2SD1071 has a VCE of 300V, even that did not like the Wipac coil on a Seagull motor, that was the reason for adding a 200V 5W TVS. Using transistors with too low a VCEO will cause reliability problems. This is probably why the Nova modules fail. The modules when finished & tested do need poting, as vibration will eventually cause problems with the wiring of the components.