Active Low-Pass Sallen-Key Op-Amp Filter

Electrical Diagrams · made in Skemio

Circuit diagram illustrating an active Sallen-Key filter network powered by a 15V DC rail with cascaded resistor-capacitor stages and terminating load.

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What it shows

Two cascaded RC poles achieve sharp second-order frequency cutoff.
Active feedback loop stabilizes Q factor without bulky inductors.
High-impedance op-amp buffers the output from downstream loading.

The takeaway

Sallen-Key topologies deliver sharp second-order filtering using only standard resistors and caps.

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