BAJA SLO MkII overdive pedal project 040218  [verified]

Original effect designs complete with verified schematics, layouts and instructions. All project were freely contributed by members and cannot be used for commercial purposes without consent of the respective owners of the copyright.
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287m
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Post by 287m »

Wowsshhh. Finally, my favorite circuit.
Shit, out of njfet. Why this come after place order :scratch:

didnt think fit in 1590B :| unless 9mm pots came.
Image

Thanks Baja!
plush wrote:
287m wrote: or where the best position to experiment?
Between clipping diodes and output buffer. Don't forget to decouple.

If any volume drop occurs, you can replace output buffer with a power booster.
Or add another gain stage to look like this: ->[clipping diodes]->[buffer/amplifier]->[tonestack]->[output buffer/amplifier]->[volume knob]

You can find classic soldano tonestack in gewgl.
latest build, stacked with baxandall tmb style. Im not satisfied, but he said good enough. :D

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mkenny17
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my favorite amplifier: Marshall JTM 45 Mk II
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Post by mkenny17 »

bump. still waiting for PCB Layout or Vero Layout for the MkIII SLO Overdrive :D

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FiveseveN
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Post by FiveseveN »

mkenny17 wrote: 17 May 2020, 11:22 still waiting
WTF is keeping you from making one? If you don't know how, take it as an opportunity to learn.
Ignorance more frequently begets confidence than does knowledge. (Charles Darwin)

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mkenny17
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Post by mkenny17 »

FiveseveN wrote: 17 May 2020, 13:46
mkenny17 wrote: 17 May 2020, 11:22 still waiting
WTF is keeping you from making one? If you don't know how, take it as an opportunity to learn.
well yeah, thanks for the advice. but currently as i type this i'm also learning how to make it happen.

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FiveseveN
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Post by FiveseveN »

Alright, now we're talking. What software are you working with? I've been meaning to switch to KiCad myself and it looks like there are plenty of learning resources.
Ignorance more frequently begets confidence than does knowledge. (Charles Darwin)

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rockola
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Post by rockola »

FiveseveN wrote: 17 May 2020, 19:25 Alright, now we're talking. What software are you working with? I've been meaning to switch to KiCad myself and it looks like there are plenty of learning resources.
Here's a KiCAD learning resource for you: I redrew the schematic in KiCAD, you can download it from

https://github.com/rockola/slo-overdrive

Just import the schematic to pcbnew (literally one mouse click) and lay out the PCB.

PS: there are some small cosmetic differences, notably I drew Vbias pointing up where possible, however the schematic should be 100% equivalent to bajaman's MkIII, let me know if there are errors. I also didn't include the bypass switch nor the LED.

KiCad 5 is required. Latest (and recommended) version is 5.1.6, however I'm using the development version, let me know if it doesn't open for you.

PPS: Footprints have not been assigned so there's a bit more work to get to that one mouse click.

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FiveseveN
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Post by FiveseveN »

Way to leave a guy without excuses to procrastinate! :D
I'm actually working on a hybrid (Blackstar HT style) SLO preamp so I'll probably do that one instead. There's some info about its current state in this log, under "Tube Boomer".
Maybe mkenny17 will tackle it if going for KiCad as well.
Ignorance more frequently begets confidence than does knowledge. (Charles Darwin)

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SYK0T3K
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Post by SYK0T3K »

Guys, can someone explain to me what is the need for multiple gain stages?

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bajaman
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Post by bajaman »

"Guys, can someone explain to me what is the need for multiple gain stages?"
answer: read the first post in this thread ;-)
be kind to all animals - especially human beings

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Repo
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Post by Repo »

Is there a demo of this pedal somewhere?

Thanks!

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