Brown Sound in a Box II (BSIAB2)

by gaussmarkov

Brown Sound in a Box 2 Layout

Ed Guidry designed this one and I took his schematic from The BSIAB 2 is apparently one of the most popular distortion circuits on Aron’s forum. tungngruv on kindly wrote to say that he built the circuit successfully with this layout.

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22 Responses to “Brown Sound in a Box II (BSIAB2)”

  1. audioguy said:

    As part of my High Gain Shoot out I plan this weekend- I built your layout of the BSIAB2. I plugged in and it sounded good, but WAAAAY too low end heavy. After comparing yours to GGGs layout I found that the 2 caps closest to the Vol pot are incorrect. You’ve got .022, GGG has them as .0022. I swapped them and the thing sounds great!

    Posted 05.06.2007 at 1:54 pm

  2. gaussmarkov said:

    Thanks very much! I will fix that immediately!

    That’s a great thread by the way. Thanks for starting that one.

    Posted 06.06.2007 at 1:55 pm

  3. Maury McCown said:

    I notice that you have D1 going to ground. The original schematic has it inline from 9v+ on to C4 and the R2/R6 1M resistor cluster. I’m also not seeing your C2 cap int he original schematic.

    Did you add D1 and C2 for power filtering?

    Posted 10.05.2008 at 7:20 am

  4. Maury McCown said:


    NEVER MIND! I wasn’t paying attention well enough!

    Posted 10.05.2008 at 7:40 am

  5. Rodrigo B. said:


    Thanks for the layout i’ve made this and sounds really awesome. i’ve a question, when i set the gain control to 0 i have no sound at all, i ‘ve to turn around to 1 to get a sound, also happen with Dr. Boogie, layout, why is that?

    Cheers !!!!!!!!!!!!

    Posted 11.05.2009 at 2:03 pm

  6. Sven von Heyden said:

    I built the BSIAB2 last week and I really like it. Could have a little bit more bass. I used shielded wire from lug2 of the level-pot to the footswitch to reduce feedbacks. Thank you very much for this project! The next will be your spring reverb 🙂 Greetings from Germany

    Posted 23.05.2009 at 6:31 pm

  7. rob said:

    hi…any chance of some audio samples…using humbuckers for a change…most of these sites are fender heads..thus mostly single coil so you never get a chance of hearing the pedals at full gain…cheers dude..pukka site…

    Posted 15.06.2009 at 7:01 pm

  8. chrisw said:

    Anyone tell me what size the box caps are are used with the BSIAB2 pcb? Are they 7.2mm in length or 7.5. Even better if some one can give me the Mouser number!


    Posted 29.06.2009 at 7:50 pm

  9. dorothegreat said:

    used your layout. just finished testing it in a gig last night and sounds great.

    thank you very much for the layout.

    Posted 27.02.2010 at 12:10 am

  10. Dr Ronn said:

    Completed and demo’ed. Worked perfect and as always, some of the BEST sound i have ever heard…pedal OR amp! Thank you Gauss! 🙂

    Posted 02.05.2010 at 9:13 pm

  11. mario moran said:

    Hi, I have a question about the 1 uf caps in the bsiab pedal. The general guitar gadgets site has them listed as a film type but the schematic shows one as polarized and one non polarized. Does anyone know the correct kind?

    Posted 05.05.2010 at 5:07 pm

  12. Mike said:

    Hey man I got some questions and maybe troubles jo jo… emmm which are as follow:
    1. how are the pots conected??? I mean te numbers are left to right looking it face up
    2.the jacks got me a little confused on the connections using both stereo types but kind of different from the ones on the layout I got…
    and 3. the DC jack is a little different too and got me confused as well about which + goes to the millenium and which to the battery… thanks for the help =)

    Posted 14.09.2010 at 9:50 pm

  13. Brandon said:

    Hey, I just built the BSIAB2 as per your specs and I am not getting any output from effect. I am getting bypassed sound when the effect is off, but when I switch to the effect I get nothing. I have checked the pinouts on the transistors, the direction of diode and polarized caps, the wiring of my DC jack and stereo input jacks, everything is good.

    I may have wired the pots backward. In your layout, am I looking at the front of the pots or the back of the pots?

    Posted 23.10.2010 at 5:59 pm

  14. none said:

    Thanks for this neat project, which sounds amazing.

    Posted 28.06.2011 at 1:52 pm

  15. varonos6910 said:

    what’s the trimmer exactly ‘s doing ?and how can i set it up right?

    Posted 16.12.2011 at 4:10 pm

  16. rowell said:

    hai sir where is the part list of this distortion?tnx

    Posted 08.06.2012 at 12:13 am

  17. rowell said:

    i like to made it..

    Posted 08.06.2012 at 12:13 am

  18. rick mendez said:

    any chance of having more gain..saludos.

    Posted 06.03.2013 at 2:23 pm

  19. Oche said:

    Hi, I would like to know the real size to print the pcb, a reference in cm or else, because if I let the printer whitout scale the size it´s wrong. Thanks

    Posted 14.08.2014 at 8:59 am

  20. gaussmarkov said:


    The image in the PDF document is scaled correctly for printing at the standard (100%) scale. Specify this scale in your printer app.

    Best, gm

    Posted 14.08.2014 at 4:17 pm

  21. Luis Angel Carty said:

    Hola amigos de la página y un saludo para gaussmarkov. Al colocar el pot del drive en cero no me da sonido alguno, es decir me apaga la guitarra como si fueses el pot de volumen, ¿¿alguno de ustedes pudo solucionar ese inconveniente?? espero sus respuestas muchas gracias y saludos desde Lima Perú Sudamérica : )

    Posted 22.09.2014 at 8:30 pm

  22. Oche said:

    Hi, first at all, Im not good in electronics, anyway my bsiab is working properly, (just a bit hum noise), I would like to try that contour mod:
    It´s easy to know where is the place to install the pot? and the resistor to change is R8?
    Thanks a lot.

    Posted 23.09.2014 at 6:23 pm