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BoomBoom24
BoomBoom24
F
BASS FUZZ / OCTAVER
X Type:
Build Level: Intermediate
Based On: Maestro® Brassmaster™
The 2024 version of the BoomBoom has no significant circuit changes and minor layout tweaks.
The Brassmaster had a short production life (around 3-4 years) way back in the 70's. It's one of
those pedals that has passed into some kind of mythology because of its rareness. But, there are
good reasons to warrant the hype. It delivers that special kind of "highly compressed wall of fuzz"
that you can really dig into. And, those units seem to go for four figures nowadays. Build one for
1/50th the price!
The BoomBoom is a 95% Brassmaster. It uses a more widely available transformer than the
vintage unit (but similar spec) and it adds an output volume control.
BASS: Sets the volume of clean bass sent to the output.
SENSE: Sets the input volume to the octaver/EQ circuit.:
BRASS: Set the output volume of the octaver/EQ circuit.
VOL: The total mixed output from the BASS, SENSE and BRASS controls.
HARM: In the left position, this switch adds some extra octave up signal in parallel with the EQ
circuit. In the right position, it sends the full octave up directly to the EQ.
BRASS1/2: This switch toggles between two EQ settings. The left position is mids-focused and
the right position is mids-scooped.
See the Notes section for a little more info on using the controls.
Terms of Use:
You are free to use purchased BoomBoom24 circuit boards for both DIY and small commercial operations. You may not offer BoomBoom24 PCBs for
resale or as part of a "kit" in a commercial fashion. Peer to peer re-sale is fine, though.
Technical assistance
for is available via the
available to respond via email in a timely and continuous manner, and (2) posting technical problems and solutions in the forum creates a record from which other
members may benefit.
All copyrights and registered trademarks are property of their original owners. Any mention of trademarked or intellectual properties in this documents is purely for
comparative purposes.
Overview
Controls
madbeanpedals
forum. Please go there rather than emailing me for personal assistance. This is because (1) I'm not always
Last Updated:
November 20, 2024 3:40 PM
© 2024
madbeanpedals

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Summary of Contents for madbeanpedals BoomBoom24

  • Page 1 Terms of Use: You are free to use purchased BoomBoom24 circuit boards for both DIY and small commercial operations. You may not offer BoomBoom24 PCBs for resale or as part of a “kit” in a commercial fashion. Peer to peer re-sale is fine, though.
  • Page 2: Parts Layout

    Parts Layout BoomBoom24 pg. 2...
  • Page 3: Component Values

    Component Values BoomBoom24 pg. 3...
  • Page 4 Trace Layout BoomBoom24 pg. 4...
  • Page 5 Wiring The BoomBoom24 is compatible with both the SSBP and SSABP bypass boards available at madbeanpedals. The wiring is the same for both. BoomBoom24 pg. 5...
  • Page 6 2N3392 2N3392 2N3392 100n 2N3392 150R 2N3392 2N5308 Transformer XFM1 42TM018 Switches 100uF 220k 100n HARM SPDT 220k 47uF BRASS1/2 3PDT Pots BASS 10kB BRASS 10kB SENSE 10kB 100kA 150k 820R 2n3392: http://smallbear-electronics.mybigcommerce.com/transistor-2n3392/ 2n5308: http://smallbear-electronics.mybigcommerce.com/transistor-2n5308/ 42TM018: https://www.mouser.com/ProductDetail/42TM018-RC BoomBoom24 pg. 6...
  • Page 7: Shopping List

    On/On, Solder Lug 3PDT On/On, Solder Lug 10kB PCB Right Angle 16mm 100kA PCB Right Angle 16mm Additional Hardware (1) 125B enclosure (2) 1/4” mono jacks (1) Slim 2.1mm DC jack (1) Standard 3PDT footswitch (1) 5mm LED BoomBoom24 pg. 7...
  • Page 8 Use the Build Pic (2nd to last page) to see the transistor orientation. The 2n3392 are kind of neat with their oval, smooth packaging. Make sure you put the transformer in the right way! The PCB has labels for Primary and Secondary (P and S). BoomBoom24 pg. 8...
  • Page 9: Circuit Voltages

    Circuit Voltages Q1 2n3392 Q4 2n3392 Q7 2n5308 0.77 0.64 0.95 2.05 193mV 55mV 33mV Q2 2n3392 Q5 2n3392 0.85 260mV Q3 2n3392 Q6 2n3392 1.94 9.17 1.35 • 9.42vDC One Spot • Current Draw ~ 5mA BoomBoom24 pg. 9...
  • Page 10: Drill Template

    Coordinates are denoted in (X,Y), drill size format starting from the center (0,0) location of the enclosure. Tayda drill template: https://drill.taydakits.com/box-designs/new?public_key=aWFBYVhIWC9MaTE3dXlNZUNTU0huUT09Cg== Hardware 125B enclosure Mono jacks Slim 2.1mm DC jack Standard 3PDT footswitch 5mm LED NOTE: Different 1/4” and DC jack styles may require different sized drill holes. BoomBoom24 pg. 10...
  • Page 11 Build Pic Previous version build. BoomBoom24 pg. 11...
  • Page 12 Schematic BoomBoom24 pg. 12...

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