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March 21, 2021 / consort3

Tunable 3rd order Rumble filter

The 3rd order equal capacitor low pass filter gave me the idea for an equal resistor high pass filter by swapping resistors for reactances and vice versa. With a 3 ganged pot. I have made it tunable from 10Hz to 100Hz. You need supplies for the opamp.which could be a NE5532.

3rdgain2a

3rdgain2z

Another application for a 3 gang pot is a Twin T filter or oscillator. A 47k pot in series with 2.7k resistors and using 2 off 2.2n and a 8.8n capacitor will give a tunable notch from 1k to 19k. A 47k pot is available here:

https://www.omeg.co.uk/potentiometers/unswitched/eco/eco-3-gang/

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