Second-Order Butterworth Low-Pass Filter Circuit Diagram Examples
The second-order Butterworth low-pass filter is a cornerstone of analog signal processing, offering a maximally flat passband and a predictable -40 dB/decade roll-off. On this page, you’ll find a collection of circuit diagrams for second-order Butterworth low-pass filters, including popular Sallen-Key and multiple-feedback topologies. These examples are ideal for electronics engineers, students, and hobbyists designing audio crossovers, anti-aliasing filters, and sensor signal conditioning circuits.
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About these examples.
Each diagram is rendered with ChatDiagram’s circuit diagram tool, so you can easily edit component values, adjust the topology, or export a high-resolution image for your documentation.
Whether you need a unity-gain Sallen-Key implementation or a gain stage with a multiple-feedback architecture, these circuits are ready to adapt. Use the generator below to create your own second-order Butterworth low-pass filter diagram in minutes.
Make one yourself.
Select a second-order Butterworth low-pass filter template
Start from a pre-built Sallen-Key or multiple-feedback circuit to save time.
Adjust component values
Change resistor and capacitor values to set your desired cutoff frequency and Q factor (typically 0.707 for Butterworth).
Connect the signal path
Ensure the input, op-amp, and output are properly wired according to the chosen topology.
Add annotations
Label nodes, component values, and the filter response to make the diagram self-explanatory.
Export or share
Download as SVG, PNG, or share a live link to collaborate with your team.
Frequently asked questions
What is a second-order Butterworth low-pass filter?
What is the difference between Sallen-Key and multiple-feedback topologies?
How do I calculate component values for a second-order Butterworth filter?
What is the cutoff frequency of a Butterworth filter?
Can I use a single-supply op-amp for a second-order Butterworth filter?
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