need some help for my modification - treble booster with clean blend

[hellsparrow]

Hi, guys.
I need an error check for pedal modification, can you give me an opinion if it's okay?
I pray that the anomalous communication caused by using a translator doesn't confuse you too much

The circuit diagram and artwork below are the pedals I'm trying to make this time
Intended to add a Clean Blend knob based on the PPCB Dragon Breath pedal (https://www.pedalpcb.com/product/pcb402/)




I made it with reference to the 3. "Additive" Op Amp Blend circuit of this post on the forum, and added an inverting jfet buffer to reverse the inverted phase
(https://forum.pedalpcb.com/threads/why-your-clean-blends-suck-or-how-to-clean-blend.20986/)

Looking at it, I think the jfet inverting buffer block is designed to be a complete sham

As long as I decided to make a treble booster, it seems inevitable that the signal will flip once, is there a way to complete the circuit without using a second OPAMP?

 

[jesuscrisp]

This one might sound horrible with the buffer up front I'm afraid, also not sure how much sense it makes AND you'd definitely need to flip the phase back on the clean part. I'd rather just do a treble booster with the range and maybe a tone control and the heat/gain externally so you can vary whether you want a more clean or more dirty sort of tone as well as the EQ.

 

[Chuck D. Bones]

Putting a blend pot on a EQ can give unexpected results. The EQ, in this case a Treble Boost, changes the phase as a function of frequency. When you mix that back in with the dry signal, you can get humps and/or notches in the overall freq response.

I agree with jesuscrisp. There are so many variations on the basic Treble Boost that you should be able to achieve the tone you desire without re-inventing the wheel. If the purpose of this effort is to see what happens, then by all means give it a try. Have you run simulations or breadboarded this circuit?

 

[hellsparrow]

Putting a blend pot on a EQ can give unexpected results. The EQ, in this case a Treble Boost, changes the phase as a function of frequency. When you mix that back in with the dry signal, you can get humps and/or notches in the overall freq response.

I agree with jesuscrisp. There are so many variations on the basic Treble Boost that you should be able to achieve the tone you desire without re-inventing the wheel. If the purpose of this effort is to see what happens, then by all means give it a try. Have you run simulations or breadboarded this circuit?

my experience of using klon centaur and gladio sc as gain boosters was very positive.
I vaguely thought that when I mixed the clean signal in moderation, it would suppress the extremeness unique to the treble booster and make it very sweet...

Was it a bit of a naive approach?

Also I don't really prefer breadboarding because the debugging process is exhausting...
I live in an area where I can get made in China pcb samples very quickly, so I just skip the breadboard verification and work on the next revision

Anyway, I understood what you said, and I will try to create an ideal tone without a clean blend.

thanks for your help