What are your favourite blues breaker mods?

[neiltheseal]

I'm looking to add a presence control to a pro-10 build. By any chance, you can share with us how you did that for your mod? Thanks

Hey. Well I didn't modify the blues breaker PCB, I used EasyEDA to make my own version based on the mods suggested in this thread. Here is my schematic.

Looking at the pro 2 schematic, it looks like you could replace R10 with a trimpot and add a capacitor between the trimpot and Vref.

C7 in the schematic will have an effect here, not sure what. You could always remove it.

Although the presence is mroe of a set and forget for me. You could always change the caps in the tone section to 33nf or more if there is too much treble. Tha'ts what I did.

 

[jcrhee]

Hey. Well I didn't modify the blues breaker PCB, I used EasyEDA to make my own version based on the mods suggested in this thread. Here is my schematic.

Looking at the pro 2 schematic, it looks like you could replace R10 with a trimpot and add a capacitor between the trimpot and Vref.

C7 in the schematic will have an effect here, not sure what. You could always remove it.

Although the presence is mroe of a set and forget for me. You could always change the caps in the tone section to 33nf or more if there is too much treble. Tha'ts what I did.

Thank you for this. Will follow your instructions on my mod. I actually prefer a little more treble than stock. I'm the select few that turn the presence control on my king of tone up to noon.

 

[andrewsrea]

I like to keep it low gain. My mods are to replace R3 and R6 with 50K linear trim pots, so that you can dial in 27K & 33k respectively for a KOT and dial in the resistance to 4K7 & 3K3 to bring it back to BB. You can also experiment with them to come up with your own gain frequency. I also like to insert a 25K linear trim pot before and in series with C7 to act as a presence control.

 

[MindFarter]

Hello All New Member, and noob at DIY Pedal Building
I am trying to build a Blue Breaker Mod for a friend, unfortunately, I do not have a lot of time left due to bad health
I have been working on this design for about a week now, and I want to call it the Big Balls Breaker, after the AC/DC song
All the parts have not arrived yet so I have not been able to breadboard it yet, I have been learning from the Brian Wampler course
https://www.guitarpedalcourse.com is an amazing course for beginners like me.
Between the course and YouTube videos and forums, I have developed a schematic that I think will work.
The Mods: JFET Boost into the Gain with on/on/on switch to toggle between gain, Tone Stack, Treble and Bass, second op-amp and 2-way switch for mono/stereo, and 3 sets of Diodes, Genuine MA859 (can't believe I got them) 1N4148 and BAT41 with an on/on/on toggle switch.
According to my latest MRI, I am demented so please check my schematic for errors, there are bound to be a few.
Please do point out any errors you see. Any recommendations for different resistors or capacitors are always welcome. I will try them all when I breadboard it.
I would love to create a PCB, I have done the schematic in easyEDA and I have put a PCB together and deleted it about 100 times while I have been working on this pedal, I need to make sure the schematic is correct before I create a PCB for the pedal.
Any help with this project is more than welcome and very much appreciated.


Thank you

 

[cdwillis]

I did a quick glance and your gain pot isn't set up right. The lug 1 should be going to the negative pin of the op amp, not ground. Your 100pf resistor needs to connect the positive and negative pins there. C10/C12 and R12/R13 are redundant too. Just use one cap and a 10k resistor. I never noticed any difference between 100nf and 220nf in that spot. Hell, when I play around on the breadboard I just omit that cap entirely and the circuit works fine.

Here's an example of that gain stage from one of my schematics

 

[MindFarter]

Thank you very much, I knew there would be some glaring mistakes that I just could not see.
I will fix the schematic change the caps and resistors by the gain and have a good play around when I get all the parts.