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Tutorial on how a four-input multiplexer works and how to make it. It explains how it is implemented: 0:00 Introduction 2:16 Operation and truth table of the 4-input multiplexer 4:02 Implementation with logic gates 5:49 Multiplexer decoder 9:22 Multiplexer with enable 11:09 4-input multiplexer from 2-input mux 14:39 4-input multiplexer from 2-input mux with enable It is recommended to watch the tutorials first: 2-to-4 decoder: • 2-to-4 decoder - Circuits with... Two-input multiplexer: • 2-input multiplexer - Circuits with... The pdf of the presentation is available: https://doi.org/10.5281/zenodo.3724040 More about digital electronics: • Fundamentals of digital electronics Additionally, this book of solved digital electronics problems is available: https://eciencia.urjc.es/handle/10115... Finally, if you want to learn how to describe a multiplexer in VHDL, you have two videos: Multiplexer part 1: • VHDL Design 2: Multiplexer (1/2) Multiplexer part 2: • VHDL Design 2: Multiplexer (2/2) CC-BY License https://creativecommons.org/licenses/...