This circuit is an audio range low-pass filter based on the Maxim DS3903 triple 128-position non-volatile potentiometer. By modifying the values of the capacitor, or choosing a digital potentiometer with different end-to-end resistance values, this circuit can be designed with cutoff frequencies up to 500kHz. To view the complete application note, click on the link below.
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Company: MAXIM INTEGRATED CIRCUITS
Product URL: Click here for more information