Learn electronics
Short guides, no fluff. Every page has something you can click and change, so you see what happens instead of just reading about it. When you're ready, build the real circuit in VoltTrial.
The basics
Voltage, current, resistance and power. Everything else is built on these.
- Guide · 6 min readOhm's law without the boring partV = I × R in plain words, with a playground where you see the current change as you move the sliders.
- Tool · 5 min readSeries and parallel resistors, without the headacheSame parts, two ways to connect them, very different results. Add resistors and see where the current goes.
Parts and how to use them
What each part does, how to pick a value and how not to burn it.
- Guide · 5 min readWhy your LED needs a resistor (and which one to use)Put an LED straight on a battery and it dies. Here's why, and a calculator that tells you the exact resistor.
- Tool · 4 min readResistor colour codes: read them in 10 secondsTap the bands on an interactive resistor, or type a value and get the colours. Plus the easy way to remember them.
- Guide · 6 min readHow a capacitor charges (and why it's never instant)A capacitor doesn't fill up at once. Drag the time and watch the curve. Then the one rule that explains timers and delays.
- Guide · 6 min readUse a transistor as a switch (and pick the base resistor)Your control pin is weak. A transistor lets it switch something big. Calculate the base resistor and wire it right the first time.
Circuits you can build
Small, useful circuits, explained step by step.
- Tool · 5 min readVoltage divider: get any voltage from two resistorsTwo resistors turn 9 V into 4.5 V, or 5 V into 3.3 V. Here's how, and the one mistake everyone makes with it.
- Guide · 6 min readBuild a blinking LED with a 555 timerThe classic first chip. Two resistors and a capacitor set the blink speed. Calculate it, see it blink, then wire all 8 pins.
Workbench skills
Measuring, testing and finding what's wrong.