For Hobbyists & Makers · Active Filter (Bode)
Active Filter (Bode) for an op-amp filter
Built for hobbyists & makers exploring it for fun. Play with real physics and math, no license and no setup — just open and tinker. Simulate an op-amp filter live below — adjust the inputs and watch it respond, right in your browser.
Active Filter (Bode Plot)Live
shaping a frequency response
Controls
Presets
A filter passes some frequencies and blocks others. The cutoff fc = 1/(2πRC) is where the response falls 3 dB; beyond it the magnitude rolls off at 20 dB per decade per order — steeper filters cut harder. Educational tool.
Data Inspector
Cutoff frequency1.0 kHz
Roll-off40 dB/decade
At 10×fc-40 dB
Governing equation
Reading this result: The −3 dB cutoff sits at 1.0 kHz, where the low-pass response begins to roll off. Order 2 sets the steepness at 40 dB/decade — a gentle slope that eases into the stopband with minimal ringing. Raising the order steepens the roll-off while adding phase lag around the cutoff.
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
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Frequently asked questions
- Is this good for hobbyists & makers?
- Yes — this version of "Active Filter (Bode) for an op-amp filter" is framed for hobbyists & makers exploring it for fun. Play with real physics and math, no license and no setup — just open and tinker.
- Do I need to install anything?
- No. It runs in any modern browser, free, with no account required.