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Electrical Engineering
Electronics intuition for practicing engineers and students, grounded in the math. Every circuit runs live in your browser, so every waveform you see comes from a real solver, verified with simulation.
LW Labs · the Lab scope
Not a video. This is the Lab's scope driving itself through four exact circuits: an RLC ringing, a Lissajous through resonance, a transmission line's reflections and an in-amp pulling a signal out of hum. Every sample, trigger crossing and measurement is computed live. Grab any knob or key to take over.
A series RLC driven by a 5 kHz square wave. CH1 is the generator; CH2, the capacitor, rings at 50 kHz.
Live Lessons · how a lesson works
Every lesson runs the same loop on a live circuit: commit to a guess, watch the real circuit answer, then see the math that explains it. Here is lesson 1's, playing itself.
A 1 kHz square wave from a 50 Ω generator drives 1 kΩ into 100 nF. When does V(out) reach 90%? Mark it on the scope before you see the trace.
Your mark: —
Off the mark. You marked ~1 τ — that's the 63% point. 90% needs ln 10 ≈ 2.30 τ, and 99% needs 4.6 τ.
1 · LIVE
The RC network →
One pole, four views. Probe loading.
2 · LIVE
RL and the inductive kick →
Why relays need flyback diodes.
3 · LIVE
RLC: damping and Q →
Poles leave the real axis.
4 · LIVE
Impedance as geometry →
Phasors you can drag.
5 · LIVE
Filter families →
Butterworth vs Bessel vs Chebyshev, in the time domain.
6 · LIVE
The op-amp is a pole →
GBW, slew and the ideal-model lie.
In the Lab · on the board
Before a chip goes into production it's fitted to boards as an engineering sample, laser-marked ES. These are ours: the parts around the engine started on this board as engineering samples, and all of them have now made it into production. Point at a chip to read its datasheet.
Datasheets
Point at a chip to read its datasheet. Every chip on the board is in production today; the four around the engine started here as engineering samples, marked ES, and were proven on the board before they shipped.
Get an email when each one ships