01 / The question
Where does a filter stop behaving linearly?
This project characterised an active band-pass filter in an audio system, including both frequency response and saturation.
02 / The intuition
A mechanism worth testing.
A filter specification describes a range of behaviour, not a guarantee at every input amplitude.
03 / The work
Inside the method.
Explore each part of the approach.
01Understand the topology
Circuit analysis established the expected filtering role of the stage.
02Measure the Bode response
Frequency sweeps were used to compare gain and phase behaviour.
03Increase the input
Level tests investigated where the response ceased to remain linear.
04 / The observations
What emerged.
The notes record experimental response and saturation tests, with adjustments to the measurement procedure when needed.
This account is based on recorded project notes. Original reports, figures and datasets are not embedded here.
05 / The limits
Where the evidence stops.
Precise limits require the original circuit and measurement records; none are inferred from the project title.
The academic foundations