Photograph by Blake Hannaford
HOMEBREW
My LED Heirloom Clock
In the summer of 1975, I had just completed a rigorous course in digital logic design and decided to build an LED clock to last the rest of my life. To start, I partitioned the design into three printed circuit boards: display, clock logic, and power supply. I bought copper-plated boards and ferric chloride at RadioShack, signed each card with my name and the date, and etched out the boards in the backyard of my parents’ house. I bought discrete red LEDs from a surplus ...
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