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).




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27 comments:

  1. plushAugust 28, 2018 at 1:42 PM

    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. VegasVaapFebruary 20, 2021 at 10:41 PM

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

      Delete
  2. UnknownAugust 28, 2018 at 7:45 PM

    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. Effects LayoutsAugust 28, 2018 at 11:36 PM

      Thanks for verifying! How does it compare to demos?

      Delete
  3. UnknownAugust 29, 2018 at 3:20 AM

    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. Diego JorgeAugust 29, 2018 at 11:41 AM

    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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  5. UnknownAugust 29, 2018 at 11:54 AM

    This comment has been removed by the author.

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  6. UnknownAugust 29, 2018 at 11:57 AM

    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. GNWAugust 30, 2018 at 3:21 PM

      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.

      Delete
    2. Effects LayoutsAugust 30, 2018 at 3:24 PM

      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. Effects LayoutsAugust 30, 2018 at 3:46 PM

      Fixed now.

      Delete
    4. UnknownAugust 30, 2018 at 4:10 PM

      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!

      Delete
    5. Effects LayoutsAugust 30, 2018 at 9:29 PM

      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

      Delete
    6. UnknownAugust 31, 2018 at 9:26 AM

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

      Delete
  7. UnknownAugust 31, 2018 at 9:25 AM

    This comment has been removed by the author.

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  8. UnknownAugust 31, 2018 at 9:33 AM

    No worries.. Thanks a lot, mate!

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  9. UnknownSeptember 1, 2018 at 7:05 AM

    This comment has been removed by the author.

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  10. EverydayguitaristSeptember 4, 2018 at 8:12 PM

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

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  11. Syntax EraOctober 11, 2018 at 1:11 AM

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

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    Replies
    1. Effects LayoutsOctober 11, 2018 at 11:05 AM

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

      Delete
  12. Ricco SeixasJanuary 23, 2019 at 8:19 PM

    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. Taciano CanassaMay 13, 2020 at 8:30 PM

    Any drill template that fits it?

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    1. Effects LayoutsMay 13, 2020 at 10:52 PM

      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

      Delete
    2. Taciano CanassaMay 14, 2020 at 8:24 AM

      Thanks David! This pedal worths an enclosure!

      Delete
  14. Just SharingMarch 8, 2022 at 9:25 AM

    This comment has been removed by the author.

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    1. Just SharingMarch 8, 2022 at 9:35 AM

      Sorry my mistake. It works. Thanks for the layout.

      Delete

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