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PROJECT NAME
ANDROMEDA
BASED ON
Nobels ODR-1 Natural Overdrive
EFFECT TYPE
Overdrive
PROJECT SUMMARY
A unique overdrive pedal with a very refined and complex drive tone that earns it a spot on the pedal-
boards of many Nashville studio musicians.
This documentation is for the kit version of the project. If you purchased the PCB by itself, please
use the
PCB-only version
are completely different due to the specialized parts and assembly methods used in the kit.
ANDROMEDA NATURAL OVERDRIVE
LEVEL
SPECTRUM
NATURAL OVERDRIVE
IMPORTANT NOTE
of the documentation instead. The circuit is the same, but the instructions
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.4 (2024-08-08)
9V
DRIVE
DEPTH
1
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Summary of Contents for aion ANDROMEDA
- Page 1 This documentation is for the kit version of the project. If you purchased the PCB by itself, please use the PCB-only version of the documentation instead. The circuit is the same, but the instructions are completely different due to the specialized parts and assembly methods used in the kit. ANDROMEDA NATURAL OVERDRIVE...
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Page 2: Table Of Contents
20 Enclosure Layout: Main & Footswitch PCBs 21 Enclosure Layout: Input/Output PCB 22 Final Testing & Assembly 23 Schematic 24 Full Parts List 25 Troubleshooting Information 26 Support & Resale Terms 27 Legal Information & Document Revisions ANDROMEDA NATURAL OVERDRIVE... -
Page 3: Introduction
INTRODUCTION If this is your first pedal, welcome to the hobby and thank you for choosing Aion FX. You’ve just joined a community of over 100,000 people around the world with a passion for building homemade noise machines using obsolete electronics technology, and we’re glad to have you! If you’ve done this before, it’s great to see you again and we’re confident you’ll find this build experience... - Page 4 68n (0.068) 82n (0.082) 100n (0.1 or “µ1J100”) 470n (0.47) 2.2uF Electrolytic Capacitors NAME 47uF 100uF 150K MLCC Capacitors NAME 120pF (marked “121”) NAME 560pF (marked “561”) JRC4558D 100n (marked “104”) 8-pin socket Diodes NAME 1N5817 1N914 ANDROMEDA NATURAL OVERDRIVE...
- Page 5 Outer washer, potentiometer, 0.475" Other NAME LED bezel LED, blue 9V battery snap DC jack Input/output jack Mounting nut, jack, 0.54" Outer washer, jack, 0.6" Lock washer, jack, 0.5" (thin) Enclosure Enclosure screws PCB, main circuit PCB, footswitch PCB, input/output/DC ANDROMEDA NATURAL OVERDRIVE...
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Page 6: Tools Needed
The tip should used to tighten the dress nut to avoid lot of pedals! be no more than 0.1” (2.5mm) wide. scratching or denting it (which can happen with metal tools). ANDROMEDA NATURAL OVERDRIVE... -
Page 7: Component Identification
Some voltage regulators It’s recommended to use a also look like this. They may also look like this. razor blade to separate have more than 8 legs. these cleanly. WIRE ASSEMBLY WIRE ASSEMBLY HEADER DC JACK LED BEZEL ANDROMEDA NATURAL OVERDRIVE... -
Page 8: Hardware Identification
MOUNTING NUT DRESS NUT LOCK WASHER DIAMETER: 0.36” / 9.1mm DIAMETER: 0.375” / 9.5mm DIAMETER: 0.4” / 10.1mm FOOTSWITCH MOUNTING NUT DRESS NUT LOCK WASHER DIAMETER: 0.6” / 15.2mm DIAMETER: 0.77” / 19.6mm DIAMETER: 0.6” / 15.2mm ANDROMEDA NATURAL OVERDRIVE... -
Page 9: Pcb Assembly Overview
6. Transistors 7. Electrolytic capacitors Not all of these component types are included in each kit, so skip them if they aren’t applicable. Some types of film capacitors are taller than electrolytics, so those can be done last. ANDROMEDA NATURAL OVERDRIVE... -
Page 10: Resistors
15 to 20 resistors at a time or the bottom of the board will get too crowded. If this is your first time soldering, watch tutorial videos on YouTube and make sure you get it down before you begin. You don’t want to practice or experiment on this board! ANDROMEDA NATURAL OVERDRIVE... -
Page 11: Diodes
1N914 1N914 1N914 1N914 Next, you’ll populate the diodes. Diodes are polarized, so make sure to identify the polarity band (which indicates the “cathode”, or negative side) and match the band to the footprint on the PCB. ANDROMEDA NATURAL OVERDRIVE... - Page 12 ICs may have two different orientation marks: either a dot in the upper-left or a half-circle notch in the middle of the top side. Some ICs have both marks. This shows which way the IC should be rotated when inserting it into a socket (the socket also has a half-circle notch). ANDROMEDA NATURAL OVERDRIVE...
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Page 13: Transistors
These transistors do not need to be selected for any particular characteristics, so sockets are not necessary. You can just solder it directly to the board. Bend the outer leads to hold it in place on the board. Then, solder them and clip the leads. ANDROMEDA NATURAL OVERDRIVE... -
Page 14: Capacitors (Non-Polarized)
Usually the red ones have it printed on the side while the blue or gray ones have it on the top. C3 and C14 are blue MLCCs taped to cardboard. The value is hard to read on the capacitor itself, but will always be written on the cardboard. C25 (100n MLCC) is always yellow. ANDROMEDA NATURAL OVERDRIVE... -
Page 15: Wire Headers
They do fit pretty tightly in the holes, though, so press firmly. There’s also a 4-pin header on the I/O board that we will do in a later step. ANDROMEDA NATURAL OVERDRIVE... -
Page 16: Capacitors (Polarized)
The longer leg is positive and fits in the square pad. These are the last of the on-board components. Now is the time to go back to page 12 and insert the ICs into the sockets. ANDROMEDA NATURAL OVERDRIVE... -
Page 17: Footswitch Pcb
BLUE MARKING Once all three wire assemblies are soldered, set the footswitch PCB aside. We’ll solder the actual footswitch and LED in a later step. ANDROMEDA NATURAL OVERDRIVE... -
Page 18: Input/Output Pcb
Red is positive (+), black is negative (-). After soldering, pull it tight. For even more strain relief, you can thread the snap through the loop to form a knot. (not shown) ANDROMEDA NATURAL OVERDRIVE... -
Page 19: Enclosure Layout: Panel Mounts
You’ll need to hold the bezel in place when OUTER WASHER tightening the nut. The top of the bezel is fairly MOUNTING NUT sharp, so try using a rubber band for grip instead of pressing your finger against the bottom. ANDROMEDA NATURAL OVERDRIVE... -
Page 20: Enclosure Layout: Main & Footswitch Pcbs
However, Aion FX projects are designed to be extremely easy to remove from the enclosure for troubleshooting, with no desoldering required—so with these kits, it’s actually much easier to “box it before you rock it”. -
Page 21: Enclosure Layout: Input/Output Pcb
Note the use of two mounting nuts on each of the jacks, one inside and one outside. The inner nut acts as a spacer to set the DC jack flush with the outside of the enclosure. The inner nuts should be threaded as far down as they can go. MOUNTING NUT OUTER WASHER LOCK WASHER MOUNTING NUT 125B ANDROMEDA NATURAL OVERDRIVE... -
Page 22: Final Testing & Assembly
Be careful not to over-tighten or you may damage the set screw. But if it’s not tight enough, the knob will be more likely to fall off or lose its alignment with the markings on the enclosure. Last, just close the panel on the back using the four screws. That’s it! ANDROMEDA NATURAL OVERDRIVE... -
Page 23: Schematic
SCHEMATIC 1N5817 100uF 100n 47uF GND GND 47uF 2N5088 25kB SPECTRUM 560p PN4303 IC2B IC1A JRC4558D JRC4558D IC2A JRC4558D IC1B JRC4558D 250kA GAIN ANDROMEDA NATURAL OVERDRIVE... -
Page 24: Full Parts List
47uF 1N914 2.2uF (2u2) 47uF 1N914 100n (104) 1N914 82n (0.082uF) 82n (0.082uF) Transistors Potentiometers Switches PART VALUE PART VALUE PART VALUE PART PN4303 JRC4558D Drive 250kA 3PDT stomp 2N5088 JRC4558D Spectrum 25kB Depth 50kC Level 50kA ANDROMEDA NATURAL OVERDRIVE... -
Page 25: Troubleshooting Information
For transistors and JFETs, the legs will be marked on the PCB. VOLTAGE VOLTAGE VOLTAGE 4.68 4.68 9.40 4.68 4.68 0.57 4.67 4.65 4.62 4.68 VOLTAGE 4.68 4.68 4.68 4.69 3.71 9.40 9.40 4.28 9.40 ANDROMEDA NATURAL OVERDRIVE... - Page 26 “goop” the PCB or otherwise obscure the source. In other words: you don’t have to go out of your way to advertise the fact that you use Aion FX kits, but please don’t go out of your way to hide it.
- Page 27 These kits are intended to be built by the customer. Aion FX is not responsible for language that may be used by the customer in the marketing or resale of the finished product.
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