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PROJECT NAME
OBSIDIAN
BASED ON
BOSS
®
MZ-2 Metalizer
EFFECT TYPE
Overdrive / distortion
PROJECT SUMMARY
The analog section of an obscure all-in-one digital metal pedal, featuring a JFET circuit very similar to
the BD-2 Blues Driver and OD-2 Overdrive.
Actual size is 2.3" x 2.42" (main board) and 1.78" x 0.86" (bypass board).
OBSIDIAN METAL DRIVE
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.0 (2023-09-08)
1
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Related Manuals for aion Obsidian
Summary of Contents for aion Obsidian
- Page 1 The analog section of an obscure all-in-one digital metal pedal, featuring a JFET circuit very similar to the BD-2 Blues Driver and OD-2 Overdrive. Actual size is 2.3” x 2.42” (main board) and 1.78” x 0.86” (bypass board). OBSIDIAN METAL DRIVE...
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Page 2: Table Of Contents
7 Schematic 11 Document Revisions INTRODUCTION The Obsidian Metal Drive is based on the analog section of the BOSS ® MZ-2 Digital Metalizer, first released in 1987. Not to be confused with the Metal Zone (MT-2), the MZ-2 was an attempt at an all- in-one metal pedal that includes onboard chorus and delay to replicate popular tones of the 1980s. -
Page 3: Parts List
Metal film resistor, 1/4W Metal film resistor, 1/4W 100k Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W OBSIDIAN METAL DRIVE... - Page 4 Schottky diode, DO-41 2SK209-GR JFET, N-channel, SOT-23 Original uses 2SK117-GR. 2SK209-GR is the SMD equivalent. 2SK209-GR JFET, N-channel, SOT-23 Original uses 2SK117-GR. 2SK209-GR is the SMD equivalent. 2SK209-GR JFET, N-channel, SOT-23 Original uses 2SK117-GR. 2SK209-GR is the SMD equivalent. OBSIDIAN METAL DRIVE...
- Page 5 Switchcraft 111X or equivalent. 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent. 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. OBSIDIAN METAL DRIVE...
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Page 6: 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. Using through-hole adapters If you’re not confident in your ability to work with surface-mount parts, Aion FX offers 2SK209-GR JFETs (the SMD version of 2SK117-GR and 2SK184-GR) that come pre-soldered to adapters for use in through-hole designs. -
Page 7: Schematic
SCHEMATIC +8.2V +8.2V +4.1V +2.5V 2N5088 2N5088 1N5817 100uF 47uF 47uF 47uF 47uF 100n 47uF 47uF 2SK117GR 2N3906 2SK117GR 2SK117GR 270k 2N3906 100pF 100pF 2N5088 2SK117GR DRIVE 250kA 100n 2N5088 2N5088 OBSIDIAN METAL DRIVE... -
Page 8: Drill Template
INCH 0.625” 0.625” ø3/8” ø3/8” ø1/2” LEVEL DRIVE x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” TONE x: 0, y: +0.66 ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.775 x: 0, y: -1.775 ø5/16” ø15/32” OBSIDIAN METAL DRIVE... -
Page 9: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B OBSIDIAN METAL DRIVE... -
Page 10: Wiring Diagram
WIRING DIAGRAM NC OUT GND +V +V JACK GND JACK GND GND PCB 125B OBSIDIAN METAL DRIVE... -
Page 11: Document Revisions
(In other words: you don’t have to go out of your way to advertise the fact that you use these PCBs, but please don’t go out of your way to hide it. The guitar effects industry needs more transparency, not less!) DOCUMENT REVISIONS 1.0.0 (2023-09-08) Initial release. OBSIDIAN METAL DRIVE...
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