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PROJECT NAME
MEGALITH
BASED ON
®
ZVEX
Box of Rock & Distortron
EFFECT TYPE
Amp-like overdrive / distortion
PROJECT SUMMARY
A two-channel drive composed of cascaded MOSFET boost stages. The drive channel and boost channel
can be combined or selected independently.
Actual size is 2.3" x 2.14" (main board) and 2.3" x 1.28" (bypass board).
MEGALITH DUAL DRIVE
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.0 (2021-11-12)
1
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Summary of Contents for aion ZVEX MEGALITH
- Page 1 PROJECT NAME MEGALITH BASED ON BUILD DIFFICULTY ® ZVEX Box of Rock & Distortron Intermediate EFFECT TYPE DOCUMENT VERSION Amp-like overdrive / distortion 1.0.0 (2021-11-12) PROJECT SUMMARY A two-channel drive composed of cascaded MOSFET boost stages. The drive channel and boost channel can be combined or selected independently.
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Page 2: Table Of Contents
TABLE OF CONTENTS 1 Project Overview 7 Drill Template 2 Introduction & Usage 8 Enclosure Layout 3-4 Parts List 9 Wiring Diagram 5 Build Notes 10 Licensing 6 Schematic 10 Document Revisions INTRODUCTION The Megalith Dual Drive is a hybrid of the ZVEX Box of Rock and Distortron, two similar pedals composed of cascaded SHO boost stages. -
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—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 470n Film capacitor, 7.2 x 3.5mm Original uses 820n for C7. If you can find one, omit C8 and C9. See build notes for more info. 330n Film capacitor, 7.2 x 3mm Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm 100n Film capacitor, 7.2 x 2.5mm...
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Page 5: Build Notes
BUILD NOTES C7 capacitor C7 is an 820n capacitor in the original. While these are still produced, they are only available from a small number of manufacturers and may be hard to find. Presumably ZVEX chose this value after experimentation since 1uF is a lot more common. The Megalith PCB adds footprints for three capacitors in parallel (C7, C8 and C9) so you can mix and match values to add up to 820n. -
Page 6: Schematic
SCHEMATIC 1N5817 FROM INPUT 100uF 100n JACK SW1A SW1C DRIVE A BOOST A DRIVE BOOST DRIVE C FROM BOOST C DRIVE B MAIN FROM BOOST B BOOST OUTPUT SW1B JACK 470k DRIVE BS170 BS170 BS170 1N5239 DRIVE HI GAIN OOST OUT BOOST IN BS170 1N5239... -
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 MEGALITH DUAL DRIVE... -
Page 9: Wiring Diagram
WIRING DIAGRAM D.IN D.OUT B.IN B.OUT GND +V +V JACK GND JACK DRV BOOST BOOST 125B MEGALITH DUAL DRIVE... -
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 cannotbe 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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