Aion ANDROMEDA Manuel utilisateur

ANDROMEDA NATURAL OVERDRIVE 1

PROJECT NAME

ANDROMEDA

BASED ON

EFFECT TYPE

PROJECT SUMMARY

DOCUMENT VERSION

Nobels ODR-1 Natural Overdrive

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

studio musicians.

Overdrive 1.0.2 (2020-10-29)

BUILD DIFFICULTY

Intermediate

Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board).

ANDROMEDA NATURAL OVERDRIVE 2

TABLE OF CONTENTS

1Project Overview 8Drill Template

2Introduction & Usage 9Enclosure Layout

3-5 Parts List 10 Wiring Diagram

6Build Notes 11 Licensing

7Schematic 11 Document Revisions

INTRODUCTION

The Andromeda Natural Overdrive is a recreation of the Nobels ODR-1, a somewhat obscure pedal

from Germany that nonetheless is considered a “secret weapon” among Nashville studio musicians.

The primary complaint of the ODR-1 is that it has way too much bass with no way to dial it out. To that

end, this project 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

& 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.

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.

USAGE

The Andromeda has four controls:

• Gain controls the amount of gain from the op amp that is fed through the feedback clipping diodes.

• Spectrum is a very non-standard tone control of sorts. You can pan between a 700 Hz lowpass filter

and a 5 KHz high-pass filter, which is mixed with a fixed 2.1 KHz frequency boost (upper mids). This

control is much more complex than your standard high-cut or Tube Screamer style tone control.

• Bass allows you to adjust the bass response of the circuit. The stock ODR-1 circuit is the equivalent

of having the Bass knob turned all the way up.

• Level sets the overall output of the effect.

ANDROMEDA NATURAL OVERDRIVE 3

PARTS LIST

This parts list is also available in a spreadsheet format which can be imported directly into Mouser for

easy parts ordering. Mouser doesn’t carry all the parts—notably potentiometers—so the second tab lists

all the non-Mouser parts as well as sources for each.

View parts list spreadsheet →

PART VALUE TYPE NOTES

R1 33k Metal film resistor, 1/4W

R2 1M Metal film resistor, 1/4W

R3 3k3 Metal film resistor, 1/4W

R4 2k7 Metal film resistor, 1/4W

R5 10k Metal film resistor, 1/4W

R6 1k8 Metal film resistor, 1/4W

R7 820R Metal film resistor, 1/4W

R8 1k5 Metal film resistor, 1/4W

R9 12K Metal film resistor, 1/4W

R10 39K Metal film resistor, 1/4W

R11 10K Metal film resistor, 1/4W

R12 12k Metal film resistor, 1/4W

R13 5k1 Metal film resistor, 1/4W

R14 2k2 Metal film resistor, 1/4W

R15 150K Metal film resistor, 1/4W

R16 3k3 Metal film resistor, 1/4W

R17 1k2 Metal film resistor, 1/4W

R18 43K Metal film resistor, 1/4W

R19 10K Metal film resistor, 1/4W

R20 20K Metal film resistor, 1/4W

R21 4k7 Metal film resistor, 1/4W

R22 22K Metal film resistor, 1/4W

R23 5k1 Metal film resistor, 1/4W

R24 1k2 Metal film resistor, 1/4W

R25 150K Metal film resistor, 1/4W

R26 150K Metal film resistor, 1/4W

R27 15K Metal film resistor, 1/4W

R28 15K Metal film resistor, 1/4W

LEDR 4k7 Metal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness.

ANDROMEDA NATURAL OVERDRIVE 4

PARTS LIST, CONT.

PART VALUE TYPE NOTES

C1 68n Film capacitor, 7.2 x 2.5mm

C2 22n Film capacitor, 7.2 x 2.5mm

C3 120pF MLCC capacitor, NP0/C0G

C4 82n Film capacitor, 7.2 x 2.5mm

C5 2.2uF Film capacitor, 7.2 x 5mm

C6 2.2uF Film capacitor, 7.2 x 5mm

C7 2n7 Film capacitor, 7.2 x 2.5mm

C8 82n Film capacitor, 7.2 x 2.5mm

C9 1n Film capacitor, 7.2 x 2.5mm

C10 22n Film capacitor, 7.2 x 2.5mm

C11 27n Film capacitor, 7.2 x 2.5mm

C12 100n Film capacitor, 7.2 x 2.5mm

C13 8n2 Film capacitor, 7.2 x 2.5mm

C14 560pF MLCC capacitor, NP0/C0G

C15 8n2 Film capacitor, 7.2 x 2.5mm

C16 4n7 Film capacitor, 7.2 x 2.5mm

C17 82n Film capacitor, 7.2 x 2.5mm

C18 1uF Film capacitor, 7.2 x 3.5mm

C19 2.2uF Film capacitor, 7.2 x 5mm

C20 470n Film capacitor, 7.2 x 3.5mm

C21 1uF Film capacitor, 7.2 x 3.5mm

C22 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor.

C23 47uF Electrolytic capacitor, 5mm Reference voltage filter capacitor.

C24 47uF Electrolytic capacitor, 5mm Reference voltage filter capacitor.

C25 100n MLCC capacitor, X7R Power supply filter capacitor.

D1 1N5817 Schottky diode, DO-41

D2 1N914 Fast-switching diode, DO-35

D3 1N914 Fast-switching diode, DO-35

D4 1N914 Fast-switching diode, DO-35

D5 1N914 Fast-switching diode, DO-35

D6 1N914 Fast-switching diode, DO-35 Optional. Bridge the jumper pads between D6 and D7 for the stock

ODR-1 circuit.

D7 1N914 Fast-switching diode, DO-35 Optional. Bridge the jumper pads between D6 and D7 for the stock

ODR-1 circuit.

ANDROMEDA NATURAL OVERDRIVE 5

PARTS LIST, CONT.

PART VALUE TYPE NOTES

Q1 2N5457 JFET, N-channel, TO-92 Commonly-available substitute. Original uses BC264D.

Q2 2N5088 BJT transistor, NPN, TO-92 Commonly-available substitute. Original uses 2SC2362G.

IC1 JRC4558D Operational amplifier, DIP8

IC2 JRC4558D Operational amplifier, DIP8

IC1-S DIP-8 socket IC socket, DIP-8

IC2-S DIP-8 socket IC socket, DIP-8

GAIN 250kA 16mm right-angle PCB mount pot

LEVEL 50kA 16mm right-angle PCB mount pot

SPECT 25kB 16mm right-angle PCB mount pot

BASS 50kC 16mm right-angle PCB mount pot Modification. Turn it all the way up for the stock ODR-1 circuit.

LED 5mm LED, 5mm, red diffused

IN 1/4" stereo 1/4" phone jack, closed frame Switchcraft 112BX or equivalent.

OUT 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent.

DC 2.1mm 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.

FSW 3PDT Stomp switch, 3PDT

ENC 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1.

ANDROMEDA NATURAL OVERDRIVE 6

BUILD NOTES

Bass Control

Most drive pedals will cut bass before clipping the signal. The classic benchmark is the Tube Screamer’s

720Hz filter, and most drive pedals are somewhere in this range.

The stock ODR-1 does not have very much bass-cut, and so in most rigs, it has an enormous low end

that doesn’t work very well. This is the biggest complaint about the circuit and is the fatal flaw in an

otherwise exceptional design.

Fortunately, it’s an easy problem to solve. By adding a Bass control to allow the bass to be cut down to

reasonable levels, the Andromeda becomes an incredibly usable drive effect. And with the knob all the

way up, it’s exactly like the stock ODR-1 circuit.

If for some reason you do want to leave off this control, you can jumper pins 2 and 3 of the Bass pot to

eliminate it entirely.

Clipping Diodes

The ODR-1 circuit uses both soft clipping diodes (op-amp feedback) and hard clipping diodes (signal to

ground). The hard clipping diodes clip the signal pretty aggressively, and as a result, they remove some of

the character of the effect.

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.

If you don’t want to use the additional diodes, you can either run jumper wires across them or you can

just bridge the two jumper pads to the immediate left of D7.

SCHEMATIC

ANDROMEDA CLASSIC OVERDRIVE 7

1N5817

100uF

GND

+9V

100n

33k

2N5457

GND

15K

GND GND

3k3

GND

68n

2k7

10k

22n

GND

120p

250kA

82n

1k5

820R

12K

1k8

2n7

GND

39K 10K

82n

12k

GND GND

22n

5k1

43K

25kB

27n

100n

8n2

2N5088

150K

3k3

2k2

GND

1k2 20K

10K

560p

4k7 8n2

GND

22K

5k1

4n7

82n

1k2

50kA

150K

GND

JRC4558D

GND

470n

47uF

50kC

1uF

47uF

GND

VA VB

2u2

1uF

2u2

C22

OUT

C25

R1 Q1

R27

R28

GAIN

R10 R11

R12

C10

R13

R18

SPECTRUM

C11

C12

C13

R15

R16

R14 R17 R20

R19

C14

R21

C15 R22

R23

C16

C17

R24

LEVEL

R25

R26

IC1A

IC1B

IC2A 6

IC2B

C20

C23

BASS

C21

C24

C19

C18

D7 D6

JUMPER

GND

ANDROMEDA NATURAL OVERDRIVE 8

DRILL TEMPLATE

Cut out this drill template, fold the edges and tape it to the enclosure. Before drilling, it’s recommended

to first use a center punch for each of the holes to help guide the drill bit.

Ensure that this template is printed at 100% or “Actual Size”. You can double-check this by measuring

the scale on the printed page.

Top jack layout assumes the use of closed-frame jacks like the Switchcraft 111X. If you’d rather use

open-frame jacks, please refer to the Open-Frame Jack Drill Template for the top side.

LED hole drill size assumes the use of a 5mm LED bezel, available from several parts suppliers. Adjust

size accordingly if using something different, such as a 3mm bezel, a plastic bezel, or just a plain LED.

x: 0, y: -1.20

ø15/32”

x: -0.775, y: -1.20

ø5/16”

CENTER (0,0)

ø3/8” ø1/2”

0.385”

0.625” 0.625”

ø3/8”

OUT DC IN

125B

LEVEL GAIN

SPECTRUM BASS

FOOTSWITCHLED

x: -0.65, y: +1.71 x: 0.65, y: +1.71

ø9/32” ø9/32”

x: -0.65, y: +0.41

ø9/32”

x: 0.65, y: +0.41

ø9/32”

0 1 2

0 1

INCH

ANDROMEDA NATURAL OVERDRIVE 9

ENCLOSURE LAYOUT

Enclosure is shown without jacks. See next page for jack layout and wiring.

125B

ANDROMEDA NATURAL OVERDRIVE 10

WIRING DIAGRAM

125B

IN +VGND N.C. N.C. OUT

PCB

GND +V +V JACK GND JACK

OUTIN

GND GND PCB

OUT

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.

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