This document outlines the modules covered in Unit 2 of a sequential circuit design course, including synchronous and asynchronous counters, up-down counters, N modulo counters, shift registers, and ring and twisted ring counters. It was authored by Mr. C.R. Shinde of the Electrical Engineering Department at Matoshri College of Engineering & Research Centre in Nashik, India, who provides his contact information at the end for any questions.