Ah, the 5mm LED. Once a popular choice ... [Ian Dunn] chose those very parts to produce his 4017 Decade Binary Clock. The clock uses only digital logic ICs to tell the time – there are no ...
There are 12 lines of three LEDs around the face of [Mike]’s clock. These LEDs represent the time in minutes in binary – the inner LED is 1, the middle LED is 2, and the outer LED is 4.
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