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Lesson 1
One resistor, one capacitor, one pole. It is also your scope probe, every CMOS gate input, and the reason edges have rise times. Commit to predictions first, then fire up the scope and see why.
Predict · 1 of 2 · baseline
A 1 kHz, 0 → 1 V square wave from a 50 Ω generator drives 1 kΩ into 100 nF. On the scope, drag the cursor to where V(out) crosses 90% of its final value after the rising edge. Estimate it in your head; that's the skill.
Result
Waiting on your call.
Make your mark, then lock it in. The answer, your error and the reason behind it land here, and the scope and every view below fire up.
Engine: in-browser MNA solver, 4,000 timesteps to periodic steady state · max deviation from closed form 0.004% of full scale · cross-checked against SPICE on this lesson's three circuits: transients within 35 µV, Bode within 10⁻⁷ dB and 10⁻⁶°.