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Missing Build Docs / Schematics
- Thread starter Robert
- Start date
Chuck D. Bones
Circuit Wizard
Can we get a schematic for the Unchained (Carl Martin Panama) please & thank you.
Robert
Reverse Engineer
It's in the PDF now.
Chuck D. Bones
Circuit Wizard
Not yet it isn't.
Chuck D. Bones
Circuit Wizard
Maybe I'm looking on the wrong webpage. I thought this was PedalPCB. 
Oh, I get it, now. It's in a PDF, just not the one I can access.
Oh, I get it, now. It's in a PDF, just not the one I can access.
Robert
Reverse Engineer
Oh, I get it, now. It's in a PDF, just not the one I can access.
This file?
Chuck D. Bones
Circuit Wizard
Oh right, another Tube Fuzz Muff Bender, mark 3. 
Feral Feline
Well-known member
No, not that one, the one on the page that hasn't been refreshed on my computer yet.
@PedalPCB Will the building documents for the project https://www.pedalpcb.com/product/pcb453/ be on the site?
I have the board waiting to be populated )) or am I the only one who ordered this board?
I have the board waiting to be populated )) or am I the only one who ordered this board?
Last edited:
jimilee
Well-known member
The values are on the board, they’re tiny, but they’re there.
Yes I know )) but it's always nice to have schematics to check and the drilling template is a big bonus alsoThe values are on the board, they’re tiny, but they’re there.
Chuck D. Bones
Circuit Wizard
The Unchained is an interesting circuit actually. The active notch filter up front makes a variable depth scoop centered at 160Hz, making it more of a bass scoop than a mid scoop. Then comes an asymmetric soft clipper with over 80dB of gain 
. It becomes very mid-focused at the highest gain settings. After that is a treble-cut Tone control followed by a level control and an inverter to undo the inversion of the Tone stage.
With all of those opamps, the Tone stage could have been Baxandall. Or the treble cut could be passive and use two less opamps.
I'm not convinced that the charge pump is necessary. With the right opamps, headroom does not need to be an issue. Looks like the max output is around 6.5Vp-p.
Another breadboard candidate.
. It becomes very mid-focused at the highest gain settings. After that is a treble-cut Tone control followed by a level control and an inverter to undo the inversion of the Tone stage.With all of those opamps, the Tone stage could have been Baxandall. Or the treble cut could be passive and use two less opamps.
I'm not convinced that the charge pump is necessary. With the right opamps, headroom does not need to be an issue. Looks like the max output is around 6.5Vp-p.
Another breadboard candidate.
jimilee
Well-known member
Totally agreeing with you. Schematics are so helpful.
jimilee
Well-known member
Thank you.
