helpme please, pasty face (soul bender) sounds like BOOM!!!

[panchokunstmann]

I built the Soul-bender, with 2 B324 and 1 2N3906 (only for now).

the problem that I have is that if the volume pot is not full, the pedal sounds like "BOOM"; with a lot of bass sounds and nothing of middle and high sounds

to be understood here goes a video:

as you can see, if the volume is at maximum pedal sounds beautiful, but if the volume pot is not the maximum, the pedal sounds like a mass of bass sounds.

I have put pots as 1M and 10k but the problem is the same. the volume pot has to be at maximum to sound good (like a soul-bender) and not as a mass of bass sounds.

I tested with more transistors and the problem persists, I really don't know what to do

please advise me


thank you very much.


Francisco

[panchokunstmann]

anyone have any idea? please

[midwayfair]

-Did you use C7, R10, and R11, and what are their values? C7, when you roll down the volume, forms a low-pass filter that varies with how much you turn down the volume; if it's too large, you will cut lots of highs.

-What are your voltages?

-Does the same thing happen when you change the guitar volume?

[panchokunstmann]

-Did you use C7, R10, and R11, and what are their values? C7, when you roll down the volume, forms a low-pass filter that varies with how much you turn down the volume; if it's too large, you will cut lots of highs.

-What are your voltages?

-Does the same thing happen when you change the guitar volume?

Jon ,thanks for helping!.

I started checking the capacitors and I realized that I had C7 with 20% tolerance, change it to 5% tolerance and the problem was solved.

I never thought I would be so a notorious difference of 20% to 5%.

really thank you very much, looks like a small problem but without your help I would have NEVER noticed how affects C7

I'm very grateful from you Jon

Pancho

[midwayfair]

Glad you got it working!