This proof-of-concept is just waiting for you to put it to good use. [Mike Tsao] wrote an Arduino sketch that lets him decode incoming audio data which could be used to program the device. He’s ...

When one counter's clock receives two consecutive spikes without the arrival of an intervening reset pulse, the high-order bit of that counter goes high. Then, a latch formed by two NOR gates of IC 4 ...

[Osgeld] built himself a binary clock. He didn’t take the time to explain his project, but he did post beautifully hand-drawn schematics and pictures of the circuit (PDF) as he was building it. We’ve ...