The 4017 is (currently) a prototype recreation of the popular CMOS IC the CD4017 I’ve taken the internal structure of the 4017 and implemented it with 210 surface mount transistors. The circuit is an approximation of what would be inside a real 4017, but all of the logic is created with the 4017s datasheet logic … Continue reading 4017 Retro CMOS Large Scale IC (LSI)