Larson scanner using 7400 series logic hardware

April 20, 2011 By 11 Comments

[RandomTask] is sharing a Larson scanner he built a few decades ago. These days you can whip one of these up using an Arduino in under an hour. He mentions this, but we agree that for nostalgic purposes there’s nothing like implementing the scanning LED effect using hardware.

Often called a Cylon Eye (after the television show Battlestar Gallactica) … Read the rest

Filed Under: led hacks Tagged With: , , , ,

FlipFlop clock uses mains frequency to keep time

April 10, 2011 By 33 Comments

flipflop_clock

One afternoon, [Sam] was a bit bored and decided he would build a clock. Not wanting to spend any money on the project, he set off to construct his clock using only the components he had on hand – this meant no micro controllers would be used whatsoever.

Built on a set of four breadboards, his clock sports a … Read the rest

Filed Under: clock hacks Tagged With: , , ,