High Pass Filter (help me)

[idvc]

Hi, I will design a very simple basic "high pass filter" for my guitar circuit. I want to light touch and shape the sound. I have already equalizer but I want to this inside of guitar circuit.

Here is the filter circuit schematic;



the Cutoff frequency value I want is ~ 397hz.


in this case, I can use R of 40K and C of 0.01uf.

Another option;
I can use R of 20K and C of 0.02uf.

Another option;
I can use R of 10K and C of 0.04uf.

All of them provide about ~ 397hz. What is the difference in between them?

[nickb]

The problem is you cannot consider the filter in isolation. It is driven by something (source) and it is connected to something (load). The impedance of both the source and the load will interact with your filter and that will influence your choice of component values. If you make the filter components low impedance it will load down the source yet if you make them too high the filter will be affected by the load (cable and amplifier). If you take a look at the typical values used for the pots in a guitar then that is a clue. I suggest you try 100K and 3.9nF as a sort of compromise.

[Chuck H]

It might help you to look up "bass cut" in the guitar tech sub forum. There are a few discussions for guitar tone controls that cover high pass filters used with actual guitar circuits.

[Mick Bailey]

I like the bass control shown here. The 1M pot can be replaced with a trim pot and tucked away inside the guitar so that the frequency can be fine-tuned. It works really well.