https://wiki.ocrobot.com/ 2026-07-19T09:21:24+00:00 https://wiki.ocrobot.com/ https://wiki.ocrobot.com/lib/tpl/20cones/images/favicon.ico text/html 2025-10-11T02:55:35+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.ocrobot.com/doku.php?id=en:knowledge:electronic:20180421&rev=1760151335&do=diff The History of PCBs The Wayback Machine: A History of Printed Circuit Boards (PCBs) from Past to Present Like many other great inventions in history, the printed circuit board (PCB) that we know today was built on a foundation of advancements throughout history. In our little corner of the world, we can trace the history of PCBs back over 130 years, when the great industrial machine of the world was just kicking into motion. What we’ll be covering in this blog is not a complete history, but ra… text/html 2025-10-11T02:55:35+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.ocrobot.com/doku.php?id=en:knowledge:electronic:2019032101&rev=1760151335&do=diff FIXME This page is not fully translated, yet. Please help completing the translation. (remove this paragraph once the translation is finished) Arduino sound level meter and spectrum analyzer Recently I have been doing some projects with the Arduino electronics platform. One of the projects involved benchmarking certain motors and required me to measure noise levels. I will cover that project in more detail in one of the future articles, but now I would like to write about the process and best…