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DragonbeardJR
DragonbeardJR
F
DISTORTION
X Type:
Build Level: Intermediate
Based On: Bixonic® Expandora™
From
Vintage
Guitar:
"Bixonic introduced the Expandora distortion/fuzz pedal in 1995, and it quickly became popular
among guitarists the likes of Billy Gibbons, Joe Satriani, Megadeth, and Bootsy Collins. The
original Expandora was loved, but had its drawbacks, such as having its DIP switches inside. It
was also a little thin-sounding. In '01 we saw the Expandora II, with more tone control and better
low-end response. And at this January's NAMM show, Bixonic introduced the Expandora 2000R,
which combines the best of both previous versions and offers a few subtle improvements, like DIP
switches on the outside making them of course more accessible, sturdier bypass switch, and a DIP
switch to toggle between the old version and newer version with more bass."
LVL, GAIN, TONE: Self-explanatory.
OFD: This switches between Overdrive (down), "Forbidden" (center) and Distortion (up) modes. It
corresponds to selections made with the DIP switch on the Expandora™.
Further Study:
https://bixonic-sound.com/pages/story
https://pedaltown.nl/en/bixonic-expandora-the-forgotten-japanese-boutique-pedal
https://www.diystompboxes.com/smfforum/index.php?topic=49782.0
https://www.diystompboxes.com/smfforum/index.php?topic=63346
Terms of Use:
You are free to use purchased DragonbeardJR circuit boards for both DIY and small commercial operations. You may not offer DragonbeardJR 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.
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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 9:29 AM
© 2024
madbeanpedals

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Summary of Contents for madbeanpedals DragonbeardJR

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

    Component Values DragonbeardJR pg. 3...
  • Page 4 Trace Layout DragonbeardJR 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. DragonbeardJR pg. 5...
  • Page 6 Caps Diodes 100n 1n914 100k 33pF 1n914 1n914 1n4001 1n914 Transistors 370R 33pF 100pF 2N5087 Opto 560R OPTO H11F1 LM308 100n LM308 4558 Switches 100k 100n 100uF On/Off/On 820k 100n Pots 10uF TONE 100kC 10uF GAIN 100n DragonbeardJR pg. 6...
  • Page 7: Shopping List

    On/Off/On, Solder Lug or PCB Pin 100kC PCB Right Angle 16mm PCB Right Angle 16mm 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 DragonbeardJR pg. 7...
  • Page 8 I have not tried it as a sub. Note the pinout of the H11F1 if you try a sub. • I recommend soldering in the SPDT switch before you populate C15 and C3 to give yourself plenty of room to maneuver the soldering iron. DragonbeardJR pg. 8...
  • Page 9: Circuit Voltages

    4.56 3.80 4.53 4.63 OPTO H11F1 0.00 0.00 0.00 37mV 4.57 9.16 4.58 4.56 4.67 7.85 9.16 9.16 4.56 90mV 4.64 4.65 8.47 4.56 4.56 9.44vDC One Spot supply Current Draw: ~6mA Knobs @ 50%, switch down DragonbeardJR pg. 9...
  • Page 10 Link to Tayda Standard Series master drill template 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. DragonbeardJR pg. 10...
  • Page 11 Build Pic DragonbeardJR pg. 11...
  • Page 12 Schematic DragonbeardJR pg. 12...

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