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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
Variable timer circuit with a pushbutton trigger, 555 timer, capacitor, adjustable resistor, and timed LED output
555 timerHow to Build a Variable Timer Circuit

Build a variable timer circuit with a 555 timer, pushbutton, LED, and adjustable delay using this beginner-friendly classroom guide.

Jun 29, 2026· 4 min read