Ripples from Mutable Instruments (open hardware) is a low pass 4th order filter. The schematic is found here https://mutable-instruments.net/modules/ripples/downloads/ripples_v40.pdf

Can I swap resistors and capacitors in the signal chain to create a high pass filter? eg R10, C7 swapped with R8, C6

I would do this is Sallen and Key configuration but the inclusion of the OTA and VCA ICs makes me question what would be the right conversion.

  • \$\begingroup\$ Assuming the circuit worked as a LPF, and you can live with the change in input impedance, you can swap the input with the input cap ground connections. NO idea why you would want to do that. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Jun 10 at 1:50

Below shows a high pass sallen key filter on the left, and a low pass sallen key filter on the right. The resistors and capacitors are swapped. (Both high and low pass filters form a band pass). If you want to convert one sallen key configuration to the other, then swap resistors and caps

enter image description here Source:


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