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GAINSPECTRUMBASSLEVEL

125B · 4 knobs

Aion FX

AndromedaNatural Overdrive

Based on the Nobels ODR-1· 4 other boards clone it

Category
Overdrive
Controls
Gain · Spectrum · Bass · Level
Difficulty
Intermediate
Price
$12.50in stock

From the vendor

A unique overdrive pedal whose complex drive tone earns it a spot on the pedalboards of many Nashville studio musicians.

Project description

The Andromeda Natural Overdrive is a recreation of the Nobels ODR-1, a German pedal from the early 1990s that has come to be known as a “secret weapon” among Nashville studio musicians.

The overwhelming complaint of the ODR-1 is that it has way too much bass with no way to dial it out. To that end, the Andromeda incorporates a variable bass control inspired by the Timmy and Zendrive. The stock tones are still there with the knob all the way up, but now you have the option to dial it back.

Looking at the schematic, you can see a stark difference with Japanese-designed pedals (i.e. most Ibanez or Boss circuits). This is German engineering at its finest—tons of odd-value resistors and capacitors forming very precise filters and signal shaping. This is not a particularly simple build, but it’s very rewarding and well worth the effort.

Note: The PCB-only version of this project uses a type of capacitor that has been temporarily discontinued by WIMA. Please see our news article about the issue and the substitution spreadsheet for project-specific recommendations. We are stocking a limited supply in the mean time. The build document has not yet been updated to reflect this. It does not impact the kits.

Schematic

The schematic is in the vendor's build document, page 7. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 79 rows

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RefValueNormalizedTypeNotes
Resistors 30
R133k33kMetal film resistor, 1/4W
R21M1MMetal film resistor, 1/4W
R33k33.3kMetal film resistor, 1/4W
R42k72.7kMetal film resistor, 1/4W
R510k10kMetal film resistor, 1/4W
R61k81.8kMetal film resistor, 1/4W
R7820R820Metal film resistor, 1/4W
R81k51.5kMetal film resistor, 1/4W
R912K12kMetal film resistor, 1/4W
R1039K39kMetal film resistor, 1/4W
R1110K10kMetal film resistor, 1/4W
R1212k12kMetal film resistor, 1/4W
R135k15.1kMetal film resistor, 1/4W
R142k22.2kMetal film resistor, 1/4W
R15150K150kMetal film resistor, 1/4W
R163k33.3kMetal film resistor, 1/4W
R171k21.2kMetal film resistor, 1/4W
R1843K43kMetal film resistor, 1/4W
R1910K10kMetal film resistor, 1/4W
R2020K20kMetal film resistor, 1/4W
R214k74.7kMetal film resistor, 1/4W
R2222K22kMetal film resistor, 1/4W
R235k15.1kMetal film resistor, 1/4W
R241k21.2kMetal film resistor, 1/4W
R25150K150kMetal film resistor, 1/4W
R26150K150kMetal film resistor, 1/4W
R2715K15kMetal film resistor, 1/4W
R2815K15kMetal film resistor, 1/4W
R2947R47Metal film resistor, 1/4W
LEDR10k10kMetal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 25
C168n68nFilm capacitor, 7.2 x 2.5mm
C222n22nFilm capacitor, 7.2 x 2.5mm
C3120pF120pMLCC capacitor, NP0/C0G
C482n82nFilm capacitor, 7.2 x 2.5mm
C52.2uF2.2uFilm capacitor, 7.2 x 5mm
C62.2uF2.2uFilm capacitor, 7.2 x 5mm
C72n72.7nFilm capacitor, 7.2 x 2.5mm
C882n82nFilm capacitor, 7.2 x 2.5mm
C91n1nFilm capacitor, 7.2 x 2.5mm
C1022n22nFilm capacitor, 7.2 x 2.5mm
C1127n27nFilm capacitor, 7.2 x 2.5mm
C12100n100nFilm capacitor, 7.2 x 2.5mm
C138n28.2nFilm capacitor, 7.2 x 2.5mm
C14560pF560pMLCC capacitor, NP0/C0G
C158n28.2nFilm capacitor, 7.2 x 2.5mm
C164n74.7nFilm capacitor, 7.2 x 2.5mm
C1782n82nFilm capacitor, 7.2 x 2.5mm
C181uF1uFilm capacitor, 7.2 x 3.5mm
C192.2uF2.2uFilm capacitor, 7.2 x 5mm
C20470n470nFilm capacitor, 7.2 x 3.5mm
C211uF1uFilm capacitor, 7.2 x 3.5mm
C22100uF100uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C2347uF47uElectrolytic capacitor, 5mmReference voltage filter capacitor.
C2447uF47uElectrolytic capacitor, 5mmReference voltage filter capacitor.
C25100n100nMLCC capacitor, X7RPower supply filter capacitor.
Diodes 7
D11N58171N5817Schottky diode, DO-41
D21N9141N914Fast-switching diode, DO-35
D31N9141N914Fast-switching diode, DO-35
D41N9141N914Fast-switching diode, DO-35
D51N9141N914Fast-switching diode, DO-35
D61N9141N914Fast-switching diode, DO-35Optional. Bridge the jumper pads between D6 and D7 for the stock ODR-1 circuit.
D71N9141N914Fast-switching diode, DO-35Optional. Bridge the jumper pads between D6 and D7 for the stock ODR-1 circuit.
Transistors 2
Q12N54572N5457JFET, N-channel, TO-92Commonly-available substitute. Original uses BC264D.
Q22N50882N5088BJT transistor, NPN, TO-92Commonly-available substitute. Original uses 2SC2362G.
ICs 2
IC1JRC4558DJRC4558DOperational amplifier, DIP8
IC2JRC4558DJRC4558DOperational amplifier, DIP8
Potentiometers 4
GAIN250kAA250k16mm right-angle PCB mount pot
LEVEL50kAA50k16mm right-angle PCB mount pot
SPECT25kBB25k16mm right-angle PCB mount pot
BASS50kCC50k16mm right-angle PCB mount potModification. Turn it all the way up for the stock ODR-1 circuit.
Switches 1
FSW3PDT3PDTStomp switch, 3PDTAvailable from Aion FX.
LEDs 1
LED5mm5MMLED, 5mm, red diffused
Jacks & sockets 5
IC1-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
IC2-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
IN1/4" stereo1/4" STEREO1/4" phone jack, closed frameSwitchcraft 112BX or equivalent.
OUT1/4" mono1/4" MONO1/4" phone jack, closed frameSwitchcraft 111X or equivalent.
DC2.1mm2.1MMDC jack, 2.1mm panel mountLumberg NEB/J 21 C or equivalent.
Hardware 2
BATTBattery snapBATTERY SNAP9V battery snapOptional. Use the soft plastic type—the hard-shell type will not fit.
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.

Other boards based on the Nobels ODR-1