3 ms·

He posts full schematics on his google+ page - https://plus.google.com/+HenrykGasperowicz https://plus.google.com/+HenrykGasperowicz Here is the schematic for

• SAI_Peregrinus 8y ago
  The bit inside the 9 volt connector isn't really logic. The flip-flops and Schmitt trigger gates are just to generate square waves at 3 different frequencies. There's also a small power supply to drop the 9V down to 6.2V for the input of that, some comparators, and a bit of filtering. The LEDs contain LC filters, tuned such that they'll light (visibly) when the appropriate frequency is applied. Touching the wire in different places creates a different parasitic load, which is detected by one of the comparators. That comparator then toggles the clock generator for the appropriate frequency, turning that LED off or on. As with all of his circuits it's a brilliantly simple idea implemented in a ridiculously constrained space.
  • sitkack 8y ago
    What I like is how it breaks down the model that most people had. Models simplify, but they also constrain and we need to always be cognizant of where the model stops. Some people over train in model-space and are unable to make thoughts that occur outside of that universe.