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A Beginner Map of Electronic Components
A plain-language tour of the common parts in a hobby circuit, from resistors and LEDs to switches, sensors and microcontrollers, and what each one is for.
Build And Tinker
Electronics Fundamentals
The core ideas and tools behind every small circuit.
Choosing a Power Supply for a Small Project
How to match a supply's voltage and current to your circuit, why too little current causes odd failures, and what a poor or mismatched supply can damage.
How a Solderless Breadboard Works
See how the hidden metal strips under a breadboard connect its rows and power rails, so you can place parts correctly and avoid common wiring mistakes.
How to Read a Circuit Diagram
Learn the common schematic symbols, how wires, junctions and grounds are drawn, and a simple method for tracing a circuit from power source to load.
Resistors, Capacitors and Diodes Explained
What resistors, capacitors and diodes do in a circuit, how to tell them apart, and the situations where a small project needs each of them.
Understanding Voltage, Current and Resistance
Voltage, current and resistance explained with everyday water analogies, plus how Ohm's law ties them together and where the analogy stops working.
Using a Multimeter to Check a Circuit
What a multimeter measures, how to set it up for safe low-voltage readings, and how to use voltage, continuity and resistance checks to find faults.
Using a Transistor as an Electronic Switch
Why a microcontroller pin cannot drive a motor or lamp directly, and how a transistor lets a tiny signal switch a larger load, with the key parts and pitfalls.
Why Floating Inputs Cause Strange Behavior
Why an unconnected input pin reads random values, and how pull-up and pull-down resistors give buttons and switches a reliable default state.
Why Your First Circuit Does Not Work
A calm, ordered method for finding the fault in a circuit that does nothing, from power and polarity checks to breadboard contacts, wiring and parts.
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