last modified: October 23, 2025
Posted on 2015-11-24— How and Why, Projects
I explain how to use the Cat Protector project's scripts to prepare an SD card with audio samples. I walk you through installing SOX and Perl, converting WAVs with ConvertAudio.pl, building a disk image, and safely writing it with dd on Linux or macOS. Read the full guide for commands and tips.
Posted on 2014-11-08— Common, Projects
I tested a prototype of my Cat Protector and then built the finished device. I’ve added a new page that walks through the whole process—design tweaks, parts, assembly, and final testing—in clear, practical steps. If you’re interested in building or learning from the project, please read the full walkthrough.
Posted on 2014-11-08— Projects
I swapped my LM386 for an NXP TDA7052 to reduce distortion and gain more volume. The TDA7052 needs only power, an input and connects to an 8Ω speaker; I added a volume trimmer (I used 47k, 10k also works). Read the full post for the schematic and wiring details.
Posted on 2014-11-06— Projects
I built a small device that detects movement on protected surfaces and plays recorded phrases in your voice to deter the cat. I documented schematics and software details, including SD access, so you can replicate or adapt it. Read the full project notes to learn how it works and ask questions.