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GAIA PREAMP DRIVE MK. II

PROJECT NAME

GAIA MK. II

BASED ON

EFFECT TYPE

PROJECT SUMMARY

DOCUMENT VERSION

Catalinbread

Galileo

An adaptation of the signature tone of Brian May from Queen, achieved by combining a Rangemaster-
style treble booster with a Vox

AC30 amp.

Overdrive / Amp Emulation

1.0.0 (2020-11-27)

Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.87” (bypass board).

BUILD DIFFICULTY

Intermediate

All manuals and user guides at all-guides.com

Summary of Contents for Gaia Mk. II

Page 1: ...eo An adaptation of the signature tone of Brian May from Queen achieved by combining a Rangemaster style treble booster with a Vox AC30 amp Overdrive Amp Emulation 1 0 0 2020 11 27 Actual size is 2 3...

Page 2: ...to 3 knobs treble booster gain just called 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...

Page 3: ...4W R10 1M Metal film resistor 1 4W R11 1M Metal film resistor 1 4W R12 56k Metal film resistor 1 4W R13 470k Metal film resistor 1 4W R14 1k Metal film resistor 1 4W R15 1k Metal film resistor 1 4W R1...

Page 4: ...y diode DO 41 Q1 PN2222A BJT transistor NPN TO 92 Can also substitute 2N3904 Q2 MMBF4393 JFET N channel SOT 23 Substitute for MPF4393 TO 92 See build notes Q3 MMBF4393 JFET N channel SOT 23 Substitute...

Page 5: ...ETs 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...

Page 6: ...D 1k 220n MPF4393 1M 1M GND VA 10k 100k 47pF VA 22n 22n 62k 12k GND 1uF 1k 2M2 2M2 GND VA MPF4393 VA 4k7 GND 1uF 8k2 1n GND GND IN OUT RPD GAIN 1 2 3 TONE 1 2 3 VOLUME 1 2 3 C1 R1 R2 C2 Q1 R3 R4 C3 C4...

Page 7: ...ed frame jacks like the Switchcraft 111X If you d rather use open frame jacks please refer to the Open Frame Jack Drill Template for the top side LED hole drill size assumes the use of a 5mm LED bezel...

Page 8: ...GAIA PREAMP DRIVE MK II 8 ENCLOSURE LAYOUT Enclosure is shown without jacks See next page for jack layout and wiring 125B All manuals and user guides at all guides com...

Page 9: ...GAIA PREAMP DRIVE MK II 9 WIRING DIAGRAM 125B IN V GND N C N C OUT PCB IN GND V V JACK GND JACK OUT IN GND GND PCB OUT All manuals and user guides at all guides com...

Page 10: ...n the experience and opinions of others Projects may be used for commercial endeavors in any quantity unless specifically noted No attribution is necessary though a link back is always greatly appreci...