Chapter 22. Experiment 22: Logically Audible

In this experiment I want to take a break from logic problems and probability. I’m going to show you how to build something that is fun, weird, and simple (although later in the book, I’m going to find a way to make it more complicated). I’m going to show you how to pass audio signals through logic chips.

Background: Neither Here nor Theremin

Long ago, in the earliest days of electronics, a gadget called a theremin created creepy noises on the sound tracks of horror movies. The theremin (pronounced “ther-a-min”) was played in real time by a performer who waved his or her hands around two rods that were sensitive to fluctuations in capacitance between the theremin and ground. A skilled operator could ...

Get Make: More Electronics now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.