Akashic Guitar effects PCB lookup
GAINLEVELSPECTRUMBASS

1590B · 4 knobs

Aion FX

Andromeda (Legacy)

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

Category
Overdrive
Controls
Gain · Level · Spectrum · Bass
Difficulty
Intermediate
Price
see vendor

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 Overdrive project is a clone of the Nobels ODR-1, a really interesting overdrive that’s a favorite among Nashville session players but remains fairly obscure otherwise. It’s a complex circuit with a great deal of precise filtering and tuning.

The overwhelming criticism of the ODR-1 is that it has too much bass. It’s true—the corner frequency in the op-amp clipping stage is very low and the stock circuit has no way to dial it out. It pairs up very well with a Telecaster bridge pickup, but not much else.

So, for this project I borrowed the Bass control from the Timmy, which makes the corner frequency variable. With the knob all the way up, it’s the stock ODR-1, but now you can turn it down to more reasonable levels. With this modification, the ODR-1 is easily in my top 3 overdrives—and I’ve played a lot of them.

Schematic

The schematic is in the vendor's build document, page 3. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 65 rows

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RefValueNormalizedTypeNotes
Resistors 28
R133k33k
R241k21.2k
R21M1M
R25150k150k
R33k33.3k
R26150k150k
R42k72.7k
R2715k15k
R510k10k
R2815k15k
R61k81.8k
R7820R820
R81k51.5k
R912k12k
R1039k39k
R1110k10k
R1212k12k
R135k15.1k
R142k22.2k
R15150k150k
R163k33.3k
R171k21.2k
R1843k43k
R1910k10k
R2020k20k
R214k74.7k
R2222k22k
R235k15.1k
Capacitors 24
C168n68n
C222n22n
C3120pF120p
C482n82n
C52u22.2uelec
C62u22.2uelec
C72n72.7n
C882n82n
C91n1n
C1022n22n
C1127n27n
C12100n100n
C138n28.2n
C14560pF560p
C158n28.2n
C164n74.7n
C1782n82n
C181u1uelec
C192u22.2uelec
C20470n470n
C213u33.3uelec
C22100uF100uelec
C2347uF47uelec
C2447uF47uelec
Diodes 5
D5areARE
D21N9141N914
D31N9141N914
D41N9141N914
D11N40021N4002
Transistors 2
Q12N54572N5457
Q22N50882N5088
ICs 1
IC2JRC4558DJRC4558D
Potentiometers 4
GAIN250KAA250kPotentiometer
LEVEL50KAA50kPotentiometer
SPECTRUM25KBB25kPotentiometer
BASS50KCC50kPotentiometer
LEDs 1
LED1intoINTO

Other boards based on the Nobels ODR-1