Hello friends! Today we will build a single-digit counter using a 555 timer, a CD4026 and a seven-segment display in Proteus ISIS. The timer supplies clock pulses, the counter advances from zero to nine, and its decoder lights the segments needed for each digit. We will also examine three different controls: blanking the display, pausing the count and resetting to zero. They can look similar in a screenshot, but they change different parts of the circuit. Understanding that distinction is useful when you later build event counters or time displays. The original diagrams and download are retained below. We will improve their explanation and add the missing hardware considerations, particularly current-limiting resistors for the display and defined levels on every control input. Figure: Seve ...