Frequency Interchange Filter range adjustment

[LaceSensor]

Hi

Had a request to adjust the range of this project .

https://docs.pedalpcb.com/project/FrequencyInterchange-PedalPCB.pdf

Does anyone have a good calculator 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!

 

[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

 

[LukeFRC]

unless you've got something happening between 190Hz and 250Hz you really need to filter out... does it need modifying? Everything else you can set in the current setting. It's also 12dB per octave filters - so not super clinical (but sound good) so I would be suprised if you needed that much tweaking. (20k and 25Hz are chosen at limits as that's typically close to human hearing)

 

[LaceSensor]

thanks for the reply.
I guess people want what they want

Anyway I was recommend a simulator which has helped figure this out

(Sample)Sallen-Key Low-pass Filter Design Tool - Result -

 

[Passinwind]

thanks for the reply.
I guess people want what they want

Anyway I was recommend a simulator which has helped figure this out

(Sample)Sallen-Key Low-pass Filter Design Tool - Result -

I'd highly suggest that you learn LTspice or something similar, it makes looking at the overall picture of how various sections interact so much easier.