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PROJECT NAME
OBSCURA
BASED ON
Prescription Electronics COB
EFFECT TYPE
Octave fuzz
PROJECT SUMMARY
Based on the octave section of the fOXX Tone Machine, this circuit adds a clean blend and a knob to
change the character of the octave effect.
Actual size is 2.3" x 1.86" (main board) and 1.78" x 0.86" (bypass board).
OBSCURA OCTAVE BLEND
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.0 (2023-09-08)
1
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Table of Contents
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Summary of Contents for aion Obscura
- Page 1 Based on the octave section of the fOXX Tone Machine, this circuit adds a clean blend and a knob to change the character of the octave effect. Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.86” (bypass board). OBSCURA OCTAVE BLEND...
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Page 2: Table Of Contents
There are a few great YouTube demos of the COB if you want to get an idea of how it works and what it’s capable of, but suffice it to say, it’s far from a typical octave fuzz. The Obscura is a direct clone of the COB except for one addition: a switch that disables the octave, adapted from our Vulcan (fOXX Tone Machine) project. -
Page 3: Parts List
Film capacitor, 7.2 x 2.5mm 10uF Electrolytic capacitor, 5mm 100n Film capacitor, 7.2 x 2.5mm 100n Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm 10uF Electrolytic capacitor, 5mm 10uF Electrolytic capacitor, 5mm 10uF Electrolytic capacitor, 5mm OBSCURA OCTAVE BLEND... - Page 4 DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. BATT Battery snap 9V battery snap Optional. Use the soft plastic type—the hard-shell type will not fit. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. OBSCURA OCTAVE BLEND...
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Page 5: Build Notes
As a result, the octave switch has been modified to have Octave, No Octave (original) and No Octave (modified) settings. Since it’s primarily an octave effect, it obviously is going to work best in the Octave mode, but there are some interesting sounds to be discovered in the other two positions. OBSCURA OCTAVE BLEND... -
Page 6: Schematic
SCHEMATIC 100R 1N5817 100uF 100n 2N3904 1N4001 OCT. SW 2N3904 OCTAVE 2N3904 2N3904 560k 120k 1N4001 100n 100k 100n GND GND OBSCURA OCTAVE BLEND... -
Page 7: Drill Template
OCTAVE x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” OCTAVE BLEND ON/OFF x: 0, y: +0.66 x: +0.85, y: +0.66 ø9/32” ø1/4” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” OBSCURA OCTAVE BLEND... -
Page 8: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B OBSCURA OCTAVE BLEND... -
Page 9: Wiring Diagram
GND +V +V JACK GND JACK GND GND PCB 125B Shown with optional 9V battery. If battery is omitted, both jacks can be mono rather than one being stereo. Leave the far-right lug of the DC jack unconnected. OBSCURA OCTAVE BLEND... -
Page 10: 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. OBSCURA OCTAVE BLEND...
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