This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Tuesday, August 28, 2018

Mr. Black BB-74x

This is Jack Deville's Marshall-in-a-box emulating a 1974X 18-watt combo amp. Tracing credit goes to Ralf Gottschalk, who has a nice little dual-layer board of this up on OshPark if you don't feel like etching or grabbing the perf for this one (build doc with schematic in the description).




25 comments:

  1. Nice layout, thanks.

    Unfortunately, op amp pedals can't truly emulate amp-related distortion. I hope boutique pedal builders will realize it someday amd all this hoax will die.

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    1. I love the simplicity of op amps. But I agree, fETs are the best simulation.

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  2. Hi, greetings from indonesia
    I have finished on perf board. It's works.
    Thanks for great layout..

    Sorry for my english.

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    1. Thanks for verifying! How does it compare to demos?

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  3. After test my build and compare with the demo, i think my build have more loud volume. I roll up master pots about 9 it's realy loud. And if i roll up tone pots in max i get weird sound like high freq noise.
    I don't have 51k resistor. So i replace with 39k and 12k in series because i think its have more space for 2 resistor in series. It's ok?

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  4. You can replace the 51k resistors with any other value (10-100k), but both must be the same value. It's only a voltage divider.

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  6. Hi! Maybe I'm wrong but I think there is a little mistake with this layout. Both sides of the 100R/1N4148 pairs connect to the pin 1 of the 4558 instead of across the feedback, so as drawn it would work as a booster instead of an overdrive. What do you think?

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    1. I belive you are right. From the schematic, both the 100R in series with the clipping diodes should go to pin 2 of the 4885. That also explains why Fuji's build is louder than the demo.

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    2. You are right. You'd just ned to swap the placement of the 100Ω resistors and the 4148 diodes to correct it. I'll update the layout momentarily.

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    3. Hi from Brazil! Have you corrected the layout above? It looks the same with both sides of the 100R/1N4148 pairs connected to the pin 1 of the 4558 instead of across the feedback as Zen of Tone mentioned before. Maybe I missed something. Could you please explain the corrected version? Thanks!

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    4. Oh man. Just all kinds of brain farts on my end. I miss read what Zen said and thought I had the 100Ω resistors connected to pin 1 instead of pin 2. NOW it's fixed and I'm going to bed. lol

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    5. Great! Everything looks good now! All the best, ZoT.

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  8. No worries.. Thanks a lot, mate!

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  10. Hey, I see you used my demo! That’s pretty cool. I hope everyone enjoys it!

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  11. What do you suggest for the non polarized 1uf caps?

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    1. The grey film box caps from Tayda are what what it's laid out for, but other can be used.

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  12. once again a great layout, tested and had a great sound, thank you very much for your work here on the site, without you it would be very difficult to have access to such accurate information, greetings from Brazil

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  13. Replies
    1. It's in the Dropbox folder with the rest of them:

      https://www.dropbox.com/s/zfg1s7guo9x66j3/Mr%20Black%20BB-74x%20drilling%20template.pdf?dl=0

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    2. Thanks David! This pedal worths an enclosure!

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