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PROJECT NAME
ANDROMEDA
BASED ON
Nobels ODR-1 Natural Overdrive
EFFECT TYPE
Overdrive
PROJECT SUMMARY
A unique overdrive pedal whose complex drive tone earns it a spot on the pedalboards of many Nashville
studio musicians.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
ANDROMEDA NATURAL OVERDRIVE
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.2 (2020-10-29)
1
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Summary of Contents for aion ANDROMEDA
- Page 1 1.0.2 (2020-10-29) PROJECT SUMMARY A unique overdrive pedal whose complex drive tone earns it a spot on the pedalboards of many Nashville studio musicians. Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board). ANDROMEDA NATURAL OVERDRIVE...
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Page 2: Table Of Contents
This is not a particularly simple build, but it’s very rewarding and well worth the effort. The new 125B version of the Andromeda has a new layout but is otherwise identical to the earlier 1590B version. No features were added or removed. -
Page 3: Parts List
Metal film resistor, 1/4W Metal film resistor, 1/4W 150K Metal film resistor, 1/4W 150K Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W LEDR Metal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness. ANDROMEDA NATURAL OVERDRIVE... - Page 4 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 Optional. Bridge the jumper pads between D6 and D7 for the stock ODR-1 circuit. 1N914 Fast-switching diode, DO-35 Optional. Bridge the jumper pads between D6 and D7 for the stock ODR-1 circuit. ANDROMEDA NATURAL OVERDRIVE...
- Page 5 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. ANDROMEDA NATURAL OVERDRIVE...
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Page 6: Build Notes
The Andromeda has been modified to have two extra diodes, D6 and D7, in series with the existing hard- clipping diodes. It’s recommended to use these. However, they are not on a switch that allows them to be toggled in and out, so they can’t be added and removed on a whim. -
Page 7: Schematic
SCHEMATIC 1N5817 100uF 100n 47uF GND GND 47uF 2N5088 25kB SPECTRUM 560p 2N5457 IC2B IC1A JRC4558D JRC4558D IC2A JRC4558D IC1B JRC4558D 250kA GAIN ANDROMEDA CLASSIC OVERDRIVE... -
Page 8: Drill Template
LEVEL GAIN x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” SPECTRUM BASS x: -0.65, y: +0.41 x: 0.65, y: +0.41 ø9/32” ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” ANDROMEDA NATURAL OVERDRIVE... -
Page 9: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B ANDROMEDA NATURAL OVERDRIVE... -
Page 10: 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. ANDROMEDA NATURAL OVERDRIVE... -
Page 11: Document Revisions
The guitar effects industry needs more transparency, not less!) DOCUMENT REVISIONS 1.0.2 (2020-10-29) Updated links for new website. 1.0.1 (2019-07-28) Removed RPD from parts list. (Not used in this circuit.) 1.0.0 (2018-08-22) Initial release. ANDROMEDA NATURAL OVERDRIVE...
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