In this case the inputs will be our seven-segment display signals. Second, and perhaps more importantly, you may not be able to safely source enough current through the device to drive all four digits at the same time. Even if you are running from a residential power supply it is wasteful since it is not necessary. If you are running on battery power you’ve reduced your battery life significantly. First, it uses roughly four times as much current to drive all four digits at the same time. You may remember from sequential circuit design that if we can cycle through the digits fast enough, it will appear as if all four digits are on at the same time due to persistence of vision (POV) effects. The term multiplexer is just a fancy way of saying data selector. A multiplexer circuit simply selects a single data source from among several inputs. The MUX will cycle through the display of the digits one at a time. To do that I will use a multiplexer circuit (MUX). Lets revisit the seven-segment display and this time use all four digits.
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