555 timerHow a 555 Timer Works in a Beginner Circuit
Learn what a 555 timer does, how RC timing changes its output, and how to explain monostable and astable modes to beginners.
From the workbench
News
Teaching notes, project walkthroughs, and hands-on electronics guides from Gary and the Mr Circuit team.
20 posts
Updated Jun 10, 2026
More topics
electric circuitsHow Circuits Connect to Physics Class
Use simple circuits to teach energy transfer, voltage, current, resistance, and evidence-based reasoning in physics class.
classroom managementHow to Manage Mixed Skill Levels in a STEM Class
Use these practical routines to teach beginners and advanced students in the same STEM class without lowering challenge or losing structure.
computer scienceWhat Are Logic Gates? AND, OR, and NOT Explained With Real Circuits
Learn what logic gates do, how AND, OR, and NOT truth tables work, and how to explain digital logic with real beginner...
beginner roboticsHow Robots Use Sensors to Make Decisions
Learn how robots use sensors to detect light, distance, and contact, then make simple decisions students can see in real classroom builds.
beginner electronicsWhy a Circuit Does Not Work: Student Troubleshooting Checklist
Use this student-friendly circuit troubleshooting checklist to find open paths, wrong polarity, bad breadboard placement, and meter-ready mistakes.
digital multimeterHow to Teach Students to Use a Digital Multimeter
Teach students to use a digital multimeter with a safe beginner routine for voltage, resistance, and continuity in STEM class.
circuitsElectricity for Middle School: What Students Actually Need to Understand
Plan a stronger middle school electricity unit by focusing on closed circuits, voltage, current, resistance, and evidence-based troubleshooting.
beginner circuitsHow to Teach Electronics When You Are Not an Electronics Expert
You do not need to be an engineer to teach beginner electronics. Use this simple classroom plan to start with safe builds,...
beginner electronicsCircuits Students Should Understand Before Robotics
Teach robotics with less confusion by covering the circuit ideas students need first: power, closed loops, polarity, sensors, motors, and troubleshooting.
beginner electronicsWhat Is a Sensor? Simple Examples for STEM Students
Learn what a sensor does, how it turns physical changes into signals, and which simple sensor examples help STEM students understand robotics...
beginner electronicsWhat Is Resistance? Simple Circuit Explanation
Learn what resistance means in a circuit, why resistors protect LEDs, and how to explain ohms to students with simple examples.
ampsWhat Is Current in a Circuit? Simple Explanation
Understand what current means in a circuit, how amps measure charge flow, and how to teach current with simple classroom examples.