AC Filters & Resonance

RC High-Pass Filter & AC Coupling Differentiator Simulator

Block DC offsets and attenuate low-frequency hum while passing crisp high-frequency waveforms and square-wave edge spikes.

Speed
Blocks DC and attenuates low frequencies while passing rapid transitions across the load resistor (CH2 leads CH1 in phase).
● CH1: CH1
● CH2: CH2

Engineering Theory & Mathematical Model

fc = 1 / (2πRC), φ = +arctan(fc / f)

Swapping the positions of R and C places the series capacitor directly in the signal path, completely blocking steady DC (f = 0 ⇒ Xc = ∞) while passing frequencies well above fc = 1/(2πRC). Notice on the oscilloscope that Vout (CH2) now leads Vin (CH1) in phase! Driving this circuit with a low-frequency square wave turns it into a classic RC pulse differentiator.

Interactive Lab Procedure

  1. Observe the phase lead of amber CH2 ahead of sky-blue CH1 at 100 Hz.
  2. Select VAC1 and switch Waveform from Sine to Square to see positive and negative differentiator edge spikes!
  3. Add a 5V DC Offset to VAC1 and confirm that CH2 stays centered cleanly around 0V (DC blocking).

Technical FAQ

What is the core governing formula for RC High-Pass Filter & AC Coupling Differentiator Simulator?

fc = 1 / (2πRC), φ = +arctan(fc / f) — Swapping the positions of R and C places the series capacitor directly in the signal path, completely blocking steady DC (f = 0 ⇒ Xc = ∞) while passing frequencies well above fc = 1/(2πRC). Notice on the oscilloscope that Vout (CH2) now leads Vin (CH1) in phase! Driving this circuit with a low-frequency square wave turns it into a classic RC pulse differentiator.

Can I modify component values and rewire this circuit live?

Yes! The schematic above runs a live MNA SPICE engine. Click any part to adjust parameters, add or delete wires and components, and click Share URL to save your custom topology.

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