Guitar feedback issue at high frequencies - please help

[Sam_sky]

I am currently using a Stratocaster Guitar to a Guitar processor to AMP (or direct PA).. 
I am getting a high frequency feedback - kindly see the attached picture.. Only when I use the acoustic guitar patch ...(for other patch I might not hear it - but its not a patch issue).. 

- I tried building a low pass filter to cut that frequency - with the attached CAP and RESISTOR value. 

- Unfortunately the overall tone gets very muddy and I needed your help cut the feedback issue yet have decent treble.. 

is it because of the cap or not sure why the before calculation does not work?

kindly help.. 

 

 

[HarryA]

What you need is a notch filter to remove only a narrow band of unwanted  frequencies . There are pedal notch filters on the market but they are pricey. Search on "guitar notch filter pedal".

Also see::  https://lambdageeks.com/notch-filter/#:~:text=A notch filter%2C also known as a frequency,while allowing other frequencies to pass through unaffected.

About half way down the page he covers guitar pedals.

If you wish to make one perhaps I could help you with it.

 

[Sam_sky]

8 hours ago, HarryA said:

What you need is a notch filter to remove only a narrow band of unwanted  frequencies . There are pedal notch filters on the market but they are pricey. Search on "guitar notch filter pedal".

Also see::  https://lambdageeks.com/notch-filter/#:~:text=A notch filter%2C also known as a frequency,while allowing other frequencies to pass through unaffected.

About half way down the page he covers guitar pedals.

If you wish to make one perhaps I could help you with it.

 

Thank you for your reply.. happy to follow any circuit that I can build

One of the main challenge here in India.. these pedal cost even more.. all they might have is a op amp and 2 to resistors.. 

Kindly assist..!

Sam

Also will Cable Ferrites or ferrite bleed help?

[tony stewart]

two variations. Critical values

 

[HarryA]

I prototyped  a couple of passive notch filter circuits including the one Tony posted. But neither were very good; two broad.

If I can find an inductor between 150 to 200 mh I will try a parallel resonant band stop filter.

This site maybe helpful:  8 Ways Of Resolving The Electric Guitar Feedback Problem

[VictorAnderson]

  

On 11/15/2023 at 7:50 AM, HarryA said:

I prototyped  a couple of passive notch filter circuits including the one Tony posted. But neither were very good; two broad.

If I can find an inductor between 150 to 200 mh I will try a parallel resonant band stop filter.

This site maybe helpful:  8 Ways Of Resolving The Electric Guitar Feedback Problem
 






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