Affordable Learning Solutions: Open Educational Resources by College

This website provides the most commonly used equations with notes on appropriate situations to employ them.

A good primary textbook by Louis Scharf (Research Professor at Colorado State University) that provides an introduction to Electrical and Computer Engineering.

Course materials by Don Johnson at Rice University. "The course focuses on the creation, manipulation, transmission, and reception of information by electronic means. Elementary signal theory; time- and frequency-domain analysis; Sampling Theorem. Digital information theory; digital transmission of analog signals; error-correcting codes."

Many open courses from MIT's Electrical Engineering and Computer Science department, from introductory undergraduate to advanced graduate levels. Courses can include downloadable lecture materials, video lectures, assignments, exams, and other materials.

"This course involves the stages, principles, and requisites of product design, and incorporates skills acquired in lower-level engineering courses. This course discusses, among other topics, project management using Gantt charts and other time management tools, various design codes and standards that engineers should be aware of while designing, including acceptable drawing standards, safety requirements, regulations, and so forth. This free course may be completed online at any time."