Adjust LP and HP filters

[LaceSensor]

Had a request to adjust the sweep range of this project .
https://docs.pedalpcb.com/project/FrequencyInterchange-PedalPCB.pdf

Does anyone have a good calculator for the type of LPF and HPF here? Im comfortable with one-potentiometer LP circuits, but these are dual-gang and I am not sure how to adjust the capacitors/resistors to effect the change.

The desired range is LP - 1k to 6k HP 30-250hz

Thanks for your help

Ian

[LaceSensor]

Ive been reading some documents on second order filters and I cant even get the example maths they provide to work with their "default" circuits.

eg https://k7mem.com/Fil_2nd_Active_LP_HP.html
eg https://www.electronics-tutorials.ws/filter/filter_6.html

Any help would be super appreciated!

Cheers

[mauman]

You could try a sim in Spice and experimentally tweak the components around the LP and HP pots, there aren't that many. 

[NorthCoast]

How about this:

https://www.allaboutcircuits.com/video-tutorials/op-amps-low-pass-and-high-pass-active-filters/

http://sim.okawa-denshi.jp/en/OPseikiLowkeisan.htm
http://sim.okawa-denshi.jp/en/OPseikiHikeisan.htm

[LaceSensor]

How about this:

https://www.allaboutcircuits.com/video-tutorials/op-amps-low-pass-and-high-pass-active-filters/

http://sim.okawa-denshi.jp/en/OPseikiLowkeisan.htm
http://sim.okawa-denshi.jp/en/OPseikiHikeisan.htm

Dude! Legendary. This works/worked perfectly to simulate the original circuit.
Im working on adjusting values now. Cheers