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.

Friday, September 22, 2017

Maestro Bass Brassmaster

The Brassmaster was originally designed for bass and also picked up by guitarists. The circuit is very unique and originals are hard to come by. I was able to lay it out to fit in a 125B with board mounted pots.


19 comments:

  1. It works :)
    i use 2n222 and mpsa14.

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  2. Probably a silly question cause I’m new to building but why so many switching connections for the brass? On the OG pedal i thought there were only two options for brass? Does it just mean the toggle switch for the brass is a 3PDT style switch and the harmonic is a SPDT?

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    Replies
    1. Yep. Read the notes at the bottom left of the layout.

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  3. Woops completly missed that, cheers!

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  4. Just built this and can't get it to work. Not done debugging yet though :)
    Just wanna ask what schematic you used for it because I am quite confused by what I see on schematics and other layouts. Also, I suppose the switch numbering is the standard
    1 4 7
    2 5 8
    3 6 9
    right?

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    1. Ok, working now. It was once user error to blame ;)

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    2. Sorry I missed your earlier comment. Glad you got it working!

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    3. not correct! should be
      123
      456
      789
      2,5,8 switched between 1 or 3, 4 or 6, 7 or 9

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    4. You're both correct, Zzoyd you've just rotated the switch 90 degrees. lol If in doubt, refer to the general layout notes and the diagram that's there.

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    5. capasitor 47n under 4n7 should be 4n7 too, according schem http://www.generalguitargadgets.com/pdf/ggg_brassm_sc.pdf

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    6. David, what about that cap 47n under 4n7?

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    7. I replaced 47nF cap for 4,7nF and it works better for me ;)

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  5. Hi ! Is there any sense for the 42TM018 audio transformer? Or whatever? where is the primary? Thanks a lot !

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  6. This comment has been removed by the author.

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  7. Aloha, I built this and also used 2n2222 and mpsa13/14. I'm getting signal, a nice clean boost, but no effect.Anything I could've missed? Q2-Q5 seem to have no affect no matter what what transistor is there or not. Q1,Q6,Q7 affect the signal. Thanks in advance to any help.

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    Replies
    1. Same thing happened to me with 2N2222. I replace them with BC550 (rotate 180° https://www.inventable.eu/wp-content/uploads/2017/07/pins_BC548_2N2222.png)

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  8. I used 2N2222A transistors from STMicroelectronics - SGS THOMSON/CDIL (bought through Tayda website April 2021), and 2N5308 for Q5 (had to switch lead orientation). It works! Loud and lots of fuzz, lots of variation between settings. I've never used an original, but this version sounds awesome with my Fender Jazz bass. Thanks Effects Layouts!

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