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

2 posts Updated Jun 29, 2026

Learn what a photocell is, how light changes its resistance, and how to teach this simple sensor in a beginner STEM circuit...

Jun 29, 2026· 3 min read

Build a simple night-light circuit on a breadboard with a photocell, LED, resistor, and transistor using this beginner-friendly classroom guide.

Jun 7, 2026· 5 min read