Aion Theseus Manuel utilisateur

THESEUS DUAL OVERDRIVE 1

PROJECT NAME

THESEUS

BASED ON

EFFECT TYPE

PROJECT SUMMARY

DOCUMENT VERSION

Analogman King of Tone

One of the earliest boutique “waitlist” pedals, this dual-channel drive is made up of two modified Mar-

shall Bluesbreaker circuits in series.

Dual-channel overdrive 1.0.1 (2022-05-13)

BUILD DIFFICULTY

Intermediate

Actual size is 4.4” x 1.52” (main board) and 4.00” x 0.74” (bypass board).

THESEUS DUAL OVERDRIVE 2

TABLE OF CONTENTS

1Project Overview 8Drill Template

2Introduction & Usage 9Enclosure Layout

3-5 Parts List 10 Wiring Diagram

6Build Notes 11 Wiring Diagram (no send/return loop)

7Schematic 12 Licensing & Document Revisions

INTRODUCTION

The Theseus Dual Overdrive is based on the Analogman King of Tone, a dual-channel drive pedal first

released in 2003 that played a big part in kicking off the boutique/handmade pedal trend. In the past

two decades it has only grown in popularity, and last we checked the waitlist is around 4 ½ years.

The King of Tone is essentially two modified Marshall Bluesbreakers in series, each independently

switchable so they can be used on their own or stacked one into the other for a more complex and

natural overdriven sound. Each channel has an internal presence control as well as DIP switches that

control the clipping diode configuration.

In 2009, Analogman began offering a “high gain” modification that can be selected as part of the

customization. We’ve added a third DIP switch position to allow this to be switchable per channel

instead of being a hard-wired modification.

Otherwise, the Theseus is a direct clone of the King of Tone, but with one added convenience: a send/

return loop between the channels. This allows the two pedals to be split up so you can have more

flexibility in where they are used on the pedalboard, or put something in between them such as a boost

or EQ for added tone shaping. If nothing is plugged into the send/return jacks, the loop is disabled.

In 2012, Analogman released the Prince of Tone, a single-channel version with a few extra tweaks. The

Prince of Tone is available from Aion FX as the Achilles Amp Overdrive.

USAGE

The Theseus has three external controls per channel:

• Drive controls the amount of gain going into the op-amp feedback diode clipping stage.

• Tone controls the treble response of the channel via a passive filter.

• Volume controls the overall output of the channel.

In addition, each channel has four internal controls:

• Presence (trimmer) is an additional passive treble control. The default position is all the way down

(full CCW) and as you turn it up it adds high-end. Noise or hiss will increase as well.

• Soft Clip (DIP switch) enables or disables the soft clipping. Default position is up (enabled).

• Hard Clip (DIP switch) enables or disables the hard clipping. Default position is down (disabled).

• High Gain (DIP switch) enables or disables the high-gain mode. Default position is up (low gain).

THESEUS DUAL 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 1M Metal film resistor, 1/4W

R2 100k Metal film resistor, 1/4W

R3 1k Metal film resistor, 1/4W

R4 27k Metal film resistor, 1/4W

R5 33k Metal film resistor, 1/4W

R6 10k Metal film resistor, 1/4W

R7 220k Metal film resistor, 1/4W

R8 6k8 Metal film resistor, 1/4W

R9 1k Metal film resistor, 1/4W

R10 6k8 Metal film resistor, 1/4W

R11 1M Metal film resistor, 1/4W

R12 47k Metal film resistor, 1/4W

R13 47k Metal film resistor, 1/4W

R14 1M Metal film resistor, 1/4W

R15 100k Metal film resistor, 1/4W

R16 1k Metal film resistor, 1/4W

R17 27k Metal film resistor, 1/4W

R18 33k Metal film resistor, 1/4W

R19 10k Metal film resistor, 1/4W

R20 220k Metal film resistor, 1/4W

R21 6k8 Metal film resistor, 1/4W

R22 1k Metal film resistor, 1/4W

R23 6k8 Metal film resistor, 1/4W

R24 1M Metal film resistor, 1/4W

R25 47k Metal film resistor, 1/4W

R26 47k Metal film resistor, 1/4W

R27 100R Metal film resistor, 1/4W

R28 100R Metal film resistor, 1/4W

R29 4k7 Metal film resistor, 1/4W LED current-limiting resistor (Ch. A) which affects LED brightness.

R30 4k7 Metal film resistor, 1/4W LED current-limiting resistor (Ch. B) which affects LED brightness.

RPD1 1M Metal film resistor, 1/4W Channel A input pulldown resistor. Can be anywhere from 1M to 2.2M.

RPD2 1M Metal film resistor, 1/4W Channel B input pulldown resistor. Can be anywhere from 1M to 2.2M.

THESEUS DUAL OVERDRIVE 4

PARTS LIST, CONT.

PART VALUE TYPE NOTES

C1 22n Film capacitor, 7.2 x 2.5mm

C2 100pF MLCC capacitor, NP0/C0G

C3 10n Film capacitor, 7.2 x 2.5mm

C4 10n Film capacitor, 7.2 x 2.5mm

C5 100n Film capacitor, 7.2 x 2.5mm

C6 10n Film capacitor, 7.2 x 2.5mm

C7 10n Film capacitor, 7.2 x 2.5mm

C8 1uF Film capacitor, 7.2 x 3.5mm

C9 1uF Electrolytic capacitor, 4mm

C10 100uF Electrolytic capacitor, 6.3mm Reference voltage filter capacitor.

C11 22n Film capacitor, 7.2 x 2.5mm

C12 100pF MLCC capacitor, NP0/C0G

C13 10n Film capacitor, 7.2 x 2.5mm

C14 10n Film capacitor, 7.2 x 2.5mm

C15 100n Film capacitor, 7.2 x 2.5mm

C16 10n Film capacitor, 7.2 x 2.5mm

C17 10n Film capacitor, 7.2 x 2.5mm

C18 1uF Film capacitor, 7.2 x 3.5mm

C19 1uF Electrolytic capacitor, 4mm

C20 100uF Electrolytic capacitor, 6.3mm Reference voltage filter capacitor.

C21 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor.

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

C23 100n MLCC capacitor, X7R Power supply filter capacitor.

D1 1N5817 Schottky diode, DO-41

D2 BAS33 Switching diode, DO-35

Original uses MA856 diodes. The BAS33 is the closest available diode

currently in production. See build notes.

D3 BAS33 Switching diode, DO-35

D4 BAS33 Switching diode, DO-35

D5 BAS33 Switching diode, DO-35

D6 1N914 Fast-switching diode, DO-35

D7 1N914 Fast-switching diode, DO-35

D8 BAS33 Switching diode, DO-35

Original uses MA856 diodes. The BAS33 is the closest available diode

currently in production. See build notes.

D9 BAS33 Switching diode, DO-35

D10 BAS33 Switching diode, DO-35

D11 BAS33 Switching diode, DO-35

D12 1N914 Fast-switching diode, DO-35

D13 1N914 Fast-switching diode, DO-35

THESEUS DUAL OVERDRIVE 5

PARTS LIST, CONT.

PART VALUE TYPE NOTES

IC1 JRC4580D Operational amplifier, single, DIP8

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

IC2 JRC4580D Operational amplifier, single, DIP8

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

MODE 6-pos DIP DIP switch, 6-position

PRES. A 50k trimmer Trimmer, 10%, 1/4"

PRES. B 50k trimmer Trimmer, 10%, 1/4"

DRIVE A 100kB 16mm right-angle PCB mount pot

DRIVE B 100kB 16mm right-angle PCB mount pot

TONE A 25kB 16mm right-angle PCB mount pot

TONE B 25kB 16mm right-angle PCB mount pot

VOL. A 100kA 16mm right-angle PCB mount pot

VOL. B 100kA 16mm right-angle PCB mount pot

LED A 5mm LED, 5mm, red diffused

LED B 5mm LED, 5mm, red diffused

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

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

SEND NMJ6HC-S 1/4" phone jack, stereo, switched

RETURN NMJ6HC-S 1/4" phone jack, stereo, switched

DC 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent.

CH. A 3PDT Stomp switch, 3PDT

CH. B 3PDT Stomp switch, 3PDT

ENC 1590BBS Enclosure, die-cast aluminum

THESEUS DUAL OVERDRIVE 6

BUILD NOTES

Clipping diodes

The King of Tone uses MA856 diodes, which clip at a slightly higher threshold than standard silicon

diodes such as 1N914 (approximately 0.82V compared to 0.7V). These diodes are long out of production

and have almost entirely disappeared from the old-stock market, likely all bought up by Analogman and

other cloners.

The BA282 and BA283 are very close to the MA856, and were the popular substitute among builders

for awhile... until they dried up too.

Now, the closest option is the BAS33. These clip at around 0.8V, still significantly higher than the 1N914

and only slightly lower than the MA856. We’ve compared the curves on a Peak DCA75 and confirmed

that they closely match the MA856 across the current test range.

The only problem is that the BAS33 went end-of-life in early 2022. Availability is still high, but

eventually they’ll join the ranks of the others.

Omitting the send/return jacks

The loop between the two channels is a modification that is not in the original King of Tone. This loop

automatically shorts together if nothing is plugged in, so it’s fully backwards-compatible if you don’t use

this feature. However, if you do want to omit it entirely, see the alternate wiring diagram on page 11.

Enclosure size

This project was designed for the Hammond 1590BBS enclosure, which has the same height as the

125B or 1590N1. If you don’t use the Hammond brand, be careful—not all 1590BBS enclosures are the

same. For example, Love My Switches sells two different types, and the CNC Pro version is correct while

the standard one is too short.

The 1590BB2 seems like a close equivalent, but it’s about 4mm shorter. It may be possible to fit this

circuit in a 1590BB2, but we have not tested it, so you’re on your own!

Another alternative is the 1590C (also available from Tayda and Love My Switches). It’s about 10mm

taller than necessary, but if that’s all you can find then it will definitely work.

SCHEMATIC

THESEUS DUAL OVERDRIVE 7

CH.B OUT

CH.A IN

CH.B IN

CH.A OUT

CHANNEL A

FROM

INPUT

CHANNEL A

FROM

OUTPUT

CHANNEL B

FROM

JACK

OUT

JACK

OUT

VA VC VA VC

SEND

RETURN

FROM

4k7

5MM

1N5817

+9V

100n

BYP_GND

100kA

25kB

100kB

GND

100R

47k

GND

100uF

GND

100uF

47k

100uF

VC VDVA

BYP_GND

100R

100uF

BYP_GND GND2 GND2

4k7

5MM

BYP_GND

GND2

22n

TL072P

GND

100pF

100k

27k

33k

10n

GND

10k

100n

220k

6k8

10n

6k8

50kB

10n

1uF 1uF

GND

100kA

25kB

100kB

22n

TL072P

100pF

100k

27k

33k

10n

10k

100n 220k

6k8

10n

6k8

50kB

10n

1uF 1uF

GND2

R29

LED A

CHANNEL A

C23

VOLUME_A

TONE_A

DRIVE_A

RPD1

CHANNEL B

R27

R12

R13

C21 C10

R25

R26

C20

R28

C22

R30

LED B

RPD2

IC1A

IC1B

C5 R7

D2 D3

D4D5

R10

PRESENCE_A

SW_1A

1 2

SW_1B

3 4

SW_1C

5 6

SW_1D

7 8

SW_1E

9 10

SW_1F

11 12

C8 C9

R11

VOLUME_B

TONE_B

DRIVE_B

C11

IC2B

IC2A

C12

R15

R14

R17

R18

C13

C14

R19

C15 R20

R21

D8 D9

D10D11

D12

D13

R22

C16

R23

PRESENCE_B

C17

R16

C18 C19

R24

THESEUS DUAL OVERDRIVE 8

x: -1.725, y: +1.14

ø9/32”

x: -0.575, y: +1.14

ø9/32”

x: +0.575, y: +1.14

ø9/32”

x: +1.725, y: +1.14

ø9/32”

x: -1.725, y: -0.01

ø9/32”

x: +1.725, y: -0.01

ø9/32”

x: +1.60, y: -1.36

ø15/32”

x: -1.60, y: -1.36

ø15/32”

x: -0.825, y: -1.36

ø5/16”

x: +0.825, y: -1.36

ø5/16”

CENTER (0,0)

ø7/16”

1/2”

(12.7mm)

1/2”

(12.7mm)

0.80”

(20.3mm)

1/2”

(12.7mm)

1.60”

(40.6mm)

1.60”

(40.6mm)

ø3/8” ø3/8”

ø7/16”

0.80”

(20.3mm)

ø1/2”

RETURNOUTPUT INPUT

LOOP

SEND

LOOP

VOLUME (B) DRIVE (B) DRIVE (A) VOLUME (A)

TONE (A)TONE (B)

CHANNEL B CHANNEL A

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.

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

0 1

INCH

THESEUS DUAL OVERDRIVE 9

ENCLOSURE LAYOUT

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

1590BBS

THESEUS DUAL OVERDRIVE 10

LOOP

SENDINPUT

LOOP

RETURN OUTPUT

VAGNDOUT IN

VAGND

CH.A

OUT

CH.A JACK SND RET +VGND JACK

OUTIN

GND

GND CH.B

OUT

CH.B

IN VC OUT

1590BBS

WIRING DIAGRAM

This is the default wiring diagram with the send/return loop. If you want to omit this loop, see the

modified wiring diagram on the next page.

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