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GAIA PREAMP DRIVE MK. I

8

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.

Top jack layout

 assumes the use of closed-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

, available from several parts suppliers. Adjust 

size accordingly if using something different, such as a 3mm bezel, a plastic bezel, or just a plain LED.

0

1

2

CM

0

1

INCH

ø3/8”

ø1/2”

0.385”

0.625”

0.625”

x: -0.65, y: +1.71

x: +0.65, y: +1.71

ø9/32”

ø9/32”

x: -0.65, y: +0.41

ø9/32”

x: +0.65, y: +0.41

ø9/32”

x: 0, y: -1.775

ø15/32”

x: -0.775, y: -1.775

ø5/16”

CENTER (0,0)

ø3/8”

125B

OUT

BASS

TREBLE

VOLUME

GAIN

FOOTSWITCH

LED

DC

IN

Summary of Contents for GAIA MK. I

Page 1: ...in place of tubes for amp like tone in a small box Overdrive Amp Emulation 1 0 0 2021 05 28 Actual size is 2 3 x 2 42 main board and 1 78 x 0 87 bypass board BUILD DIFFICULTY Intermediate This docume...

Page 2: ...457 JFETs which are no longer available in through hole format Extra pads have been provided if you want to use surface mount JFETs part number MMBF5457 which perform identically to those used in Cata...

Page 3: ...al film resistor 1 4W R10 2M2 Metal film resistor 1 4W R11 390R Metal film resistor 1 4W R12 1M Metal film resistor 1 4W R13 1M Metal film resistor 1 4W R14 100k Metal film resistor 1 4W R15 12k Metal...

Page 4: ...ytic capacitor 4mm C19 1uF Electrolytic capacitor 4mm C20 2n2 Film capacitor 7 2 x 2 5mm C21 1uF Film capacitor 7 2 x 3 5mm C22 22uF Electrolytic capacitor 5mm C23 2 2uF Electrolytic capacitor 4mm C24...

Page 5: ...e PCB mount pot BASS 1MA 16mm right angle PCB mount pot TREBLE 1MA 16mm right angle PCB mount pot VOL 100kA 16mm right angle PCB mount pot IN 1 4 mono 1 4 phone jack closed frame Switchcraft 112BX or...

Page 6: ...heet for a given part number will usually show an enormous range for crucial specifications such as VGS off and IDSS However in practice parts from the same manufacturer are usually much tighter in sp...

Page 7: ...22n 1MA GND 470k 1uF 470k 2M2 2N5457 GND 390R 47uF GND GND 2N5457 1M 1M VA GND VA 2 2uF 1uF 2n2 VA 470k 1uF 470k 3M3 2N5457 GND 1k 22uF GND GND 2N5457 1M 1M VA GND VA 2 2uF 2 2uF 1n VA 2u2 GND 100R 1...

Page 8: ...of closed 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 LE...

Page 9: ...GAIA PREAMP DRIVE MK I 9 ENCLOSURE LAYOUT Enclosure is shown without jacks See next page for jack layout and wiring 125B...

Page 10: ...GAIA PREAMP DRIVE MK I 10 WIRING DIAGRAM 125B IN V GND NC NC OUT PCB IN GND V V JACK GND JACK OUT IN GND GND PCB OUT...

Page 11: ...as suggestions based on 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...

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