aion GAIA MK.II Manual
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aion GAIA MK.II Manual

Preamp drive
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PROJECT NAME
GAIA MK. II
BASED ON
Catalinbread
®
EFFECT TYPE
Overdrive / Amp Emulation
PROJECT SUMMARY
An adaptation of the signature tone of Brian May from Queen, achieved by combining a Rangemaster-
style treble booster with a Vox
Actual size is 2.3" x 1.86" (main board) and 1.78" x 0.87" (bypass board).
GAIA PREAMP DRIVE MK. II
Galileo
AC30 amp.
®
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.0 (2020-11-27)
1

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Summary of Contents for aion GAIA MK.II

  • Page 1 PROJECT NAME GAIA MK. II BASED ON BUILD DIFFICULTY Catalinbread Galileo ® Intermediate EFFECT TYPE DOCUMENT VERSION Overdrive / Amp Emulation 1.0.0 (2020-11-27) PROJECT SUMMARY An adaptation of the signature tone of Brian May from Queen, achieved by combining a Rangemaster- style treble booster with a Vox AC30 amp.

  • Page 2: Table Of Contents

    Gain), tonestack treble (just called Tone), and master volume. The amp section’s gain control and bass knob are internally fixed. This 3-knob Galileo is the version that this project is adapted from. The original 3-knob Galileo used MPF4393 JFETs, which are no longer produced. Aion FX sells the original MPF4393 in sets of 5.

  • Page 3: Parts List

    PARTS LIST This parts list is also available in a spreadsheet format which can be imported directly into Mouser for easy parts ordering. Mouser doesn’t carry all the parts (most notably potentiometers) so the second tab lists all the non-Mouser parts as well as sources for each. →...
  • Page 4 PARTS LIST, CONT. PART VALUE TYPE NOTES 47uF Electrolytic capacitor, 5mm Film capacitor, 7.2 x 2.5mm 100n Film capacitor, 7.2 x 2.5mm 2.2uF Film capacitor, 7.2 x 5mm Can also substitute electrolytic (polarity marked on PCB) 100n Film capacitor, 7.2 x 2.5mm 470pF MLCC capacitor, NP0/C0G 22uF...

  • Page 5: Build Notes

    All surface-mount JFETs use the same pinout, so this configuration will fit any type that we’re aware of. However, always check the datasheet if you’re uncertain—they’re difficult to desolder if you make a mistake. MPF4393s from Aion FX We have a large quantity of through-hole MPF4393 and should be able to provide them in hobbyist quantities for the foreseeable future.

  • Page 6: Schematic

    SCHEMATIC 100R 1N5817 100uF 100n MPF4393 470pF 100n MPF4393 47pF 220n 100n MPF4393 MPF4393 MPF4393 100k 47pF P2N2222A 22uF 47uF GAIA PREAMP DRIVE MK. II...

  • Page 7: Drill Template

    DRILL TEMPLATE Cut out this drill template, fold the edges and tape it to the enclosure. Before drilling, it’s recommended to first use a center punch for each of the holes to help guide the drill bit. Ensure that this template is printed at 100% or “Actual Size”. You can double-check this by measuring the scale on the printed page.

  • Page 8: Enclosure Layout

    ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B GAIA PREAMP DRIVE MK. II...

  • Page 9: Wiring Diagram

    WIRING DIAGRAM N.C. N.C. OUT GND +V +V JACK GND JACK GND GND PCB 125B GAIA PREAMP DRIVE MK. II...

  • Page 10: Document Revisions

    LICENSE & USAGE No direct support is offered for these projects beyond the provided documentation. It’s assumed that you have at least some experience building pedals before starting one of these. Replacements and refunds cannot be offered unless it can be shown that the circuit or documentation are in error. All of these circuits have been tested in good faith in their base configurations.

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