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8Ball
8Ball
F
OVERDRIVE
X Type:
Build Level: Beginner
Based On: Marshall® Blues Breaker™
From the
Marshall®
"The sound of the 1962 'Bluesbreaker' amplifier became a legend, with the smooth tone, rich
warmth and full character that gave guitarists more expression than ever before. The original
Bluesbreaker pedal took this and put it in a stompbox. Today, this reissue accurately delivers
timeless tones and style once again. It captures the magic of those classic vintage amps with
added sweetness, crispness and extra edge to carry solos and squeeze out those vital harmonics."
The Standard Series version of the mbp 8-Ball project goes in a new direction with 4 clipping
modes and an optional output gain stage for added volume. You can build an OG BluesBreaker™,
a Prince of Tone™ or cook up your own variation with selected values and clipping diode types.
VOL, GAIN, TONE: self-explanatory
CLIP: This 2p4t rotary switch offers two modes each of both soft and hard clipping diodes.
BOOST: An internal slide switch that adds a low-gain boost stage to the output. Using the boost
feature also makes the effect input and output in phase with one another.
Further study:
https://pedaltown.nl/en/the-story-of-the-marshall-blues-breaker-pedal
https://thejhsshow.com/articles/what-is-a-bluesbreaker
Terms of Use:
You are free to use purchased 8Ball circuit boards for both DIY and small commercial operations. You may not offer 8Ball 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.
website:
madbeanpedals
forum. Please go there rather than emailing me for personal assistance. This is because (1) I'm not always
Last Updated:
April 25, 2024 9:27 AM
© 2024
madbeanpedals
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Summary of Contents for madbeanpedals 8Ball

  • Page 1 Terms of Use: You are free to use purchased 8Ball circuit boards for both DIY and small commercial operations. You may not offer 8Ball 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 8Ball pg. 2...
  • Page 3: Component Values

    Component Values 8Ball pg. 3...
  • Page 4 Trace Layout 8Ball pg. 4...
  • Page 5 Wiring Unless otherwise noted, all Standard Series projects have the same wiring regardless of which 3PDT bypass board is used. A 6-pin, 2” ribbon cable is recommended for soldering the connections between the two PCBs. 8Ball pg. 5...
  • Page 6 1n914 2N5088 100pF 1n914 1n914 TL072 Switches 1n914 100n BOOST DPDT - Slide 100n CLIP 2P4T 220k 100n 1n914 Pots *see notes TONE 25kB *see notes LEVEL 100kA 100n 1n914 GAIN 100kB 100n 100uF 100n 1n5817 100uF 8Ball pg. 6...
  • Page 7: Shopping List

    Mini Rotary 25kB PCB Right Angle 16mm 100kA PCB Right Angle 100kB PCB Right Angle Additional Hardware (1) 1590B enclosure (2) Lumberg 1/4” Compact mono jacks (1) Slim 2.1mm DC jack (1) Standard 3PDT footswitch (1) 5mm LED 8Ball pg. 7...
  • Page 8 Do this for both columns. If you want to try something a little different, I like the 4580DD for IC1. This is the same one used in the KOT™ and sounds very good in the BB circuit. 8Ball pg. 8...
  • Page 9: Circuit Voltages

    Circuit Voltages 4580DD 4.68 4.69 4.31 0.00 4.60 4.61 4.59 9.25 2n5088 6.74 1.38 9.44vDC One Spot supply Current Draw: ~6mA Knobs @ 50%, BOOST off 8Ball pg. 9...
  • Page 10 NOTE: The rotary switch will require a 9.5mm drill hole (change from 7.5mm) Hardware 1590B enclosure 16mm pots Lumberg 1/4” Compact 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. 8Ball pg. 10...
  • Page 11 Build Pic 8Ball pg. 11...
  • Page 12 Schematic 8Ball pg. 12...

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