Frequency Interchange Filter HPF cutoff

[Guillaurent]

I'm looking around for a HPF and LPF pedal and found the Frequency Interchange Filter PedalPCB.
I'm far from an expert in Sallen Key Filters but my math tells me that the High Pass Filter cutoff frequency would be in the 25Hz-190Hz range with the course of the HP potentiometer as it is.

I'm looking to have a HPF cutoff frequency go up to somewhere around 1.5kHz 700Hz. I was wondering it I could just replace the values of C5 and C6 from 56nF to 5.6nF.
If I got it right, the cutoff range should land at about 245Hz-1900Hz.

I'm very unaware if I'm right about using the formulas and if I'm not going to have side effects.
Any help is appreciated.

PS: I'm trying to put the schematic in LTspice but the software if so unfriendly to use...

 

[jwin615]

there are plenty of calculators online

Sallen Key Highpass Filter

Free Online Engineering Calculator to quickly estimate the Component values for a Sallen Key High Pass Filter. Documentation is also available.

www.changpuak.ch

What are you high passing at 1.5k? Bats?

 

[Guillaurent]

Brain fart, I mixed the HPF and LPF cutoffs...

It's surprisingly a bass guitar signal.
The idea is to have a loop with: Gain, HPF@700Hz, [email protected], subtile fuzz/distorsion.
This loop would be in parallel to the clean sound dialed in just not distorted enough to hear the effect but with enough harmonics in the mid range to better cut through the mix. I prototyped it in a DAW and it worked pretty good. I was curious to try it live.

 

[Passinwind]

I'm looking around for a HPF and LPF pedal and found the Frequency Interchange Filter PedalPCB.
I'm far from an expert in Sallen Key Filters but my math tells me that the High Pass Filter cutoff frequency would be in the 25Hz-190Hz range with the course of the HP potentiometer as it is.

I'm looking to have a HPF cutoff frequency go up to somewhere around 1.5kHz 700Hz. I was wondering it I could just replace the values of C5 and C6 from 56nF to 5.6nF.
If I got it right, the cutoff range should land at about 245Hz-1900Hz.

I'm very unaware if I'm right about using the formulas and if I'm not going to have side effects.
Any help is appreciated.

PS: I'm trying to put the schematic in LTspice but the software if so unfriendly to use...

If the online calculators don’t give you what you want PM me and I’ll help you get your Spice model working, it would likely go very fast on my end.