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Summary of change:
Found the problem. Puls on IC3 seemed to be lot longer than on IC1. Replaced LM1815 and added 1uF on C40 and OK. Thanks for the hints. A few remarks : I tried to setup the same engine with a 24-1, 24-2, 24-4 wheel. The compression is so high that normal pulses can be more than twice the length of the previous normal pulse. With advanced filtering i can filter normal tooth to max 194%, which is not sufficiënt for this engine. Therefore switching to 16+1
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