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IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now. Visit Preferences to set your user name 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 sufficiƫnt for this engine. Therefore switching to 16+1 Optional: Add document to category: Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.