For electrical or computer engineering students or anyone with a passing interest, this site presents a very good overview of digital logic. The basics of both combinational and sequential logic are discussed, and the design of specific components such as counters and shift registers are also illustrated. A particularly interesting section is devoted to the inner workings of logic gates, which is important to fully understand digital design. This looks beyond the gate level into the transistors and other basic elements. Even though the material is very informative overall, one possible downside to this site is that some of the circuit diagrams are a little too closely spaced.
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