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Teaching notes, project walkthroughs, and hands-on electronics guides from Gary and the Mr Circuit team.

1 post Updated Jun 29, 2026
Simple audio generator circuit with a 555 timer, potentiometer, capacitor, and piezo speaker on a breadboard
555 timerHow to Build a Simple Audio Generator

Build a simple audio generator with a 555 timer, potentiometer, and piezo speaker using this beginner-friendly STEM classroom guide.

Jun 29, 2026· 5 min read