A collection of analog filter circuits

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• Anti-aliasing filter
• Anti-hum filter 50 Hz
• Anti-hum filter 60 Hz
• High-quality reconstruction low-pass filter for digital audio
• Rumble filter
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Analog filter circuits

Here is a collection of analog filter circuits. Most of the circuits have been created using a computer-aided design software.

Active filters

• The anti-aliasing filter is a low-pass filter and is necessary at the input of an analog-to-digital converter (ADC). The same filter can be used as a reconstruction filter at the output of a digital-to-analog converter (DAC).
• The anti-hum filter 50 Hz is a notch filter and can be used to suppress the unwanted hum tone which can have been interfered by the electrical grid. This design is for a utility frequency of 50 Hz.
• The anti-hum filter 60 Hz is a notch filter and can be used to suppress the unwanted hum tone which can have been interfered by the electrical grid. This design is for a utility frequency of 60 Hz.
• The high-quality reconstruction low-pass filter for digital audio can be used at the output of a digital-to-analog converter (DAC) in a digital audio device, e.g. a CD player.
• The rumble filter is a high-pass filter and can be used to suppress the unwanted rumble sound of a turntable.