aion RUNOFFGROOVE SUPREAUX DEUX User manual

RUNOFFGROOVE SUPREAUX DEUX 1
PROJECT NAME
SUPREAUX DEUX
BASED ON
EFFECT TYPE
PROJECT SUMMARY
DOCUMENT VERSION
ROG Supreaux Deux
An updated version of the original Runoffgroove Supreaux, an adaptation of the Supro 16T amplifier
with JFETs replacing the tube stages.
JFET overdrive / amp simulator 1.0.0 (2020-06-05)
BUILD DIFFICULTY
Intermediate
Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.86” (bypass board).

RUNOFFGROOVE SUPREAUX DEUX 2
TABLE OF CONTENTS
1Project Overview 7Drill Template
2Introduction & Usage 8Enclosure Layout
3-4 Parts List 9Wiring Diagram
5Build Notes 10 Licensing
6Schematic 10 Document Revisions
INTRODUCTION
The Runoffgroove Supreaux Deux is an updated version of the Supreaux circuit, a JFET adaptation of
the Supro 16T amplifier. The original Supreaux circuit, originally designed in 2004, is well-known as the
source circuit for the JHS Superbolt and is also available as a PCB from Aion FX.
The Supreaux Deux was designed in 2008 in order to be more accurate to the sound of the Supro amp.
As the original circuit had grown in popularity, the Runoffgroove team decided that they could do better,
and the end result is something that they felt was even closer to the original amp’s character.
The Aion FX version of the Supreaux Deux is a direct adaptation of the original circuit, but with two
modifications. First, since the original circuit needs 18V power to sound right, a charge pump has been
added to get 18V from a standard 9V input. In addition, another position has been added to the Bottom
switch allowing for three settings instead of two.
Since the J201 is very difficult to find in TO-92 through-hole format, and many DIY hobbyists are
intimidated by SMD parts, Aion FX offers J201s in SMD format that have been pre-soldered to adapters
so they can be used as through-hole parts.
USAGE
The Supreaux has the following controls:
• Drive controls the volume going into the JFET clipping stage. At higher drive levels, the second JFET
will overload and clip the signal.
• Tone is a simple passive high-pass filter that can be dampened, retaining more treble as the knob is
turned up.
• Volume controls the overall output of the effect.
• Bottom is a toggle switch that reduces the amount of bass cut before the clipping stage.

RUNOFFGROOVE SUPREAUX DEUX 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 (most 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 100k Metal film resistor, 1/4W
R2 390R Metal film resistor, 1/4W
R3 56k Metal film resistor, 1/4W
R4 1M Metal film resistor, 1/4W
R5 1M Metal film resistor, 1/4W
R6 1k Metal film resistor, 1/4W
R7 100k Metal film resistor, 1/4W
R8 1M Metal film resistor, 1/4W
R9 390R Metal film resistor, 1/4W
R10 22k Metal film resistor, 1/4W
R11 100R Metal film resistor, 1/4W
RPD 2M2 Metal film resistor, 1/4W Input pulldown resistor.
LEDR 4k7 Metal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness.
C1 270pF MLCC capacitor, NP0/C0G
C2 470pF MLCC capacitor, NP0/C0G
C3 2n2 Film capacitor, 7.2 x 2.5mm
C4 2n2 Film capacitor, 7.2 x 2.5mm
C5 10n Film capacitor, 7.2 x 2.5mm
C6 470pF MLCC capacitor, NP0/C0G
C7 1n5 Film capacitor, 7.2 x 2.5mm
C8 4n7 Film capacitor, 7.2 x 2.5mm
C9 1n5 Film capacitor, 7.2 x 2.5mm
C10 68n Film capacitor, 7.2 x 2.5mm
C11 470n MLCC capacitor, X7R Power supply filter capacitor.
C12 10uF Electrolytic capacitor, 5mm Power supply filter capacitor.
C13 47uF Electrolytic capacitor, 5mm Power supply filter capacitor.
C14 470n MLCC capacitor, X7R Power supply filter capacitor.
C15 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor.
C16 100n MLCC capacitor, X7R Power supply filter capacitor.

RUNOFFGROOVE SUPREAUX DEUX 4
PARTS LIST, CONT.
PART VALUE TYPE NOTES
D1 1N5817 Schottky diode, DO-41
D2 1N4742A Zener diode, 12V, DO-41
D3 1N5817 Schottky diode, DO-41
D4 1N5817 Schottky diode, DO-41
Q1 2N5457 JFET, N-channel, TO-92 or SOT-23 Can use either 2N5457 (through-hole) or MMBF5457 (SMD).
Q2 J201 JFET, N-channel, TO-92 or SOT-23 Can use either J201 (through-hole) or MMBFJ201 (SMD).
Q3 2N5457 JFET, N-channel, TO-92 or SOT-23 Can use either 2N5457 (through-hole) or MMBF5457 (SMD).
Q1_TR 10k trimmer Trimmer, 10%, 1/4"
Q2_TR 50k trimmer Trimmer, 10%, 1/4"
Q3_TR 10k trimmer Trimmer, 10%, 1/4"
IC1 TC1044SCPA Charge pump, DIP8
IC1-S DIP-8 socket IC socket, DIP-8
TONE 500kA 16mm right-angle PCB mount pot
GAIN 500kA 16mm right-angle PCB mount pot
VOL. 100kA 16mm right-angle PCB mount pot
BTM SPDT cntr off Toggle switch, SPDT on-off-on
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.

RUNOFFGROOVE SUPREAUX DEUX 5
BUILD NOTES
Setting bias trimmers
Turn the trimmers so that the drain (“D” pad) of the JFETs measure 12V, measured with a multimeter
(red probe to “D” pad and black probe to ground).
This is just a guideline, though. You can tweak the trimmers to fine-tune the circuit to your liking. The
bias affects the total gain of the circuit, so you can make it a little cleaner or a little dirtier than stock.
J201 usage
The J201 transistor is very popular in DIY pedal designs, but was discontinued in TO-92 through-hole
format several years ago and is becoming very scarce. Genuine parts are getting expensive and many
counterfeits have entered the market.
The MMBFJ201 is a SMD version that is still in production. On the PCB, two outlines have been included
for each individual JFET, one for TO-92 and one for SMD (called SOT-23) right next to it. Make sure you
only use one or the other—don’t put both a through-hole and surface mount part in the two Q1 spots.
J201 adapters
Many DIY builders are intimidated by the small size of surface-mount parts. Aion FX offers pre-soldered
J201s on adapters so they can easily be used as through-hole parts.

SCHEMATIC
RUNOFFGROOVE SUPREAUX DEUX 6
GND
1M
1N5817
100uF
500kA
500kA
100kA
+9V
100n
100k
270pF
GND
2N5457
390R
GND
10kB
VA
TC1044SCPA
1N4742
1N5817 1N5817
470n 470n
10uF
47uF
PWR_GND
PWR_GND
PWR_GND
100R
VA
56k
470pF
GND
2n2 2n2 10n
1M 1M
470pF
GND
J201
1k
GND
50kB
VA
100k
1n5
4n7
1M
GND
2N5457
10kB
390R
GND
VA
22k
1n5
68n
GND
GND
GND
GND PWR_GND
RPD
D1
C15
GAIN
1
2
3
TONE
1
2
3
VOLUME
1
2
3
IN OUT
C16
R1
C1
Q1
R2
Q1 TRIM
1
2
3
IC1
1
2
3
4 5
6
7
8
D2
D3 D4
C11 C14
C12
C13
R11
R3
C2
C3 C4 C5
R4 R5
2
3
1
BOTTOM
C6
Q2
R6
Q2 TRIM
1
2
3
R7
C7
C8
R8
Q3
Q3 TRIM
1
2
3
R9
R10
C9
C10
GNDGND

RUNOFFGROOVE SUPREAUX DEUX 7
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.
0 1 2
CM
0 1
INCH
x: -0.65, y: +1.71 x: 0.65, y: +1.71
ø9/32” ø9/32”
x: +0.85, y: +0.66
ø1/4”
x: 0, y: +0.66
ø9/32”
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
VOLUME
BOTTOMTONE
GAIN
FOOTSWITCHLED

RUNOFFGROOVE SUPREAUX DEUX 8
ENCLOSURE LAYOUT
Enclosure is shown without jacks. See next page for jack layout and wiring.
125B

RUNOFFGROOVE SUPREAUX DEUX 9
WIRING DIAGRAM
125B
IN +VGND N.C. GND OUT
PCB
IN
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.

RUNOFFGROOVE SUPREAUX DEUX 10
LICENSE & USAGE
No direct support is offered for these projects beyond the provided documentation. It’s assumed
that you have at least some experience building pedals before starting one of these. Replacements and
refunds cannot be offered unless it can be shown that the circuit or documentation are in error.
All of these circuits have been tested in good faith in their base configurations. However, not all the
modifications or variations have necessarily been tested. These are offered only as suggestions based
on the experience and opinions of others.
Runoffgroove circuit licensing
Runoffgroove circuits have special licensing that is different from standard Aion FX projects. These
projects are for personal use only and may not be used for commercial endeavors without approval
from Runoffgroove. Here are the terms of use from their site:
runoffgroove.com projects are provided free-of-charge to builders for personal, non-commercial use. We do offer
licensing for builders who wish to sell pedals based on, in whole or in part, our projects. As part of the licensing
agreement, the builder must clearly state that the circuit was developed by runoffgroove.com, both in promotional
literature and on the circuit board. If you see a pedal for sale that seems to be based on a runoffgroove.com project
and does not credit us, the builder may not be officially licensed by us and therefore, not compensating us as the
developer. Please contact us with the information and we will investigate the situation. Thank you.
DOCUMENT REVISIONS
1.0.0 (2020-06-05)
Initial release.