rotary encoder

Found it. http://usdigital.com/products/interfaces/ics/lfls7083

The LSI Computer Systems LFLS7083 allow incremental shaft encoders to drive standard up/down counters. Connect the encoder quadrature outputs to the A and B inputs. The LFLS7083 outputs can connect directly to the up and down clock inputs of counters such as 74193 or 40193.

The next generation Encoder to Counter Interface chips are now available and recommended for new applications (DIP package, LFLS7183 / LFLS7184, or SOIC package, LFLS7183-S / LFLS7184-S ).

Well, that is not super impressive. This is my circuit, without the 74193 counters. Which means it is replacing two flip-flops and an inverter. I think I can do better. :slight_smile: