Aion IBEX Manuel utilisateur

IBEX SILICON FUZZ 1

PROJECT NAME

IBEX

BASED ON

EFFECT TYPE

PROJECT SUMMARY

DOCUMENT VERSION

Roland AF-100 Bee Baa

An early silicon fuzz with a prominent mid-scoop and footswitchable clean boost mode.

Silicon fuzz 1.0.0 (2021-10-22)

BUILD DIFFICULTY

Intermediate

Actual size is 2.3” x 2.14” (main board) and 2.3” x 1.05” (bypass board).

IBEX SILICON FUZZ 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 Ibex Silicon Fuzz is based on the AF-100 Bee Baa, Roland’s first fuzz pedal from 1972, the same year

they were established as a company.

The “Bee Baa” name presumably comes from the two tone settings: a mid-scooped buzz that sounds

like a swarm of bees, and a softer-edged tone that might evoke sheep, though you may need the help of

some of the fashionable hallucinogenics of the decade in order to get there.

There were a lot of Japanese products in the 1970s that had poorly-chosen English names, but the

Bee Baa stands tall as one of the worst. Along with along with “Funny Cat” and “Bee Gee”, this likely

contributed to Roland’s failure to get a foothold in the United States during their first couple of years.

Regardless, the Bee Baa is a classic fuzz, and original units command high prices today. In addition to the

searing fuzz tones, it also has a treble-emphasized boost mode with its own volume control, so it can be

used as a two-channel effect. The boost mode is capable of some grit, but is nowhere near a dirty treble

booster like the Rangemaster.

The Ibex is a direct clone of the Bee Baa, shrunk down to fit in a 125B enclosure but including a

secondary footswitch to toggle between boost and fuzz modes. The Tone Select footswitch has been

changed to a toggle since it’s not a good application of a footswitch, but otherwise everything is exactly

as it is in the original unit. An internal midrange trimmer has also been added to dial back the mid scoop.

USAGE

The Ibex has four controls, a toggle switch and a second footswitch:

• Sustain controls the input level of the effect in fuzz mode.

• Boost Level controls the input level of the effect in boost mode, and also acts as the volume control

in this mode.

• Tone is a low-pass filter that cuts highs. It comes after the tone switch and impacts both modes.

• Volume is the overall output of the effect in fuzz mode.

• Tone Select (toggle) selects between two different tone modes. “Bee” mode is a steep mid-scoop

while “Baa” mode is warmer and more balanced.

• Boost (footswitch) selects between boost mode and fuzz mode. In boost mode, the second and third

transistor stages and the tone-shaping section are switched out, leaving only the first transistor

stage which acts as a semi-clean boost with treble frequency emphasis.

IBEX SILICON FUZZ 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 10k Metal film resistor, 1/4W

R2 1k Metal film resistor, 1/4W

R3 1k Metal film resistor, 1/4W

R4 100k Metal film resistor, 1/4W

R5 18k Metal film resistor, 1/4W

R6 1k8 Metal film resistor, 1/4W

R7 10k Metal film resistor, 1/4W

R8 220k Metal film resistor, 1/4W

R9 10k Metal film resistor, 1/4W

R10 100k Metal film resistor, 1/4W

R11 15k Metal film resistor, 1/4W

R12 1k5 Metal film resistor, 1/4W

R13 10k Metal film resistor, 1/4W

R14 100k Metal film resistor, 1/4W

R15 15k Metal film resistor, 1/4W

R16 1k5 Metal film resistor, 1/4W

R17 10k Metal film resistor, 1/4W

R18 33k Metal film resistor, 1/4W

R19 47k Metal film resistor, 1/4W

R20 10k Metal film resistor, 1/4W

R21 47k Metal film resistor, 1/4W

R22 22k Metal film resistor, 1/4W

R23 68k Metal film resistor, 1/4W

R24 47k Metal film resistor, 1/4W

R25 1k Metal film resistor, 1/4W

R26 100R Metal film resistor, 1/4W

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

LEDR 2k2 Metal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness.

C1 1uF Film capacitor, 7.2 x 3.5mm

C2 100pF MLCC capacitor, NP0/C0G

C3 10uF Electrolytic capacitor, 5mm

C4 1uF Film capacitor, 7.2 x 3.5mm

IBEX SILICON FUZZ 4

PARTS LIST, CONT.

PART VALUE TYPE NOTES

C5 6n8 Film capacitor, 7.2 x 2.5mm

C6 1uF Film capacitor, 7.2 x 2.5mm

C7 4n7 Film capacitor, 7.2 x 3.5mm

C8 10uF Film capacitor, 7.2 x 2.5mm

C9 1uF MLCC capacitor, NP0/C0G

C10 OMIT Film capacitor, 7.2 x 2.5mm 4n7 in some vintage units, but usually omitted.

C11 10uF Film capacitor, 7.2 x 2.5mm

C12 1uF Film capacitor, 7.2 x 2.5mm

C13 2n2 Film capacitor, 7.2 x 2.5mm 4n7 in some vintage units.

C14 100n Electrolytic capacitor, 5mm

C15 2n2 Film capacitor, 7.2 x 2.5mm

C16 22n Electrolytic capacitor, 5mm

C17 47uF Electrolytic capacitor, 5mm Power supply filter capacitor.

C18 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor.

C19 100n MLCC capacitor, X7R Power supply filter capacitor.

D1 1N5817 Schottky diode, DO-41

Q1 2N5088 BJT transistor, NPN, TO-92 Substitute. Original uses 2SC644.

Q2 2N5088 BJT transistor, NPN, TO-92 Substitute. Original uses 2SC644.

Q3 2N5088 BJT transistor, NPN, TO-92 Substitute. Original uses 2SC644.

MID 25k trimmer Trimmer, 10%, 1/4”

SUS. 100kA 16mm right-angle PCB mount pot

TONE 100kA 16mm right-angle PCB mount pot

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

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

TONE SPDT on-on Toggle switch, SPDT on-on

LED 5mm red LED, 5mm, red diffused

B.LED 5mm green LED, 5mm, green 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.

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

BOOST 3PDT Stomp switch, 3PDT

FSW 3PDT Stomp switch, 3PDT

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

IBEX SILICON FUZZ 5

BUILD NOTES

Midrange trimmer

The “Bee” mode has a very steep mid-scoop reminiscent of the Superfuzz or Hyper Fuzz. An internal

trimmer has been added to dial back the amount of mid scoop (in other words, increase the mids) if it’s

too much. Generally speaking, the “Bee” mode is more useful than the “Baa” mode, so this allows a little

more fine-tuning to make this mode work across a wider variety of settings.

Setting the boost LED mode

The boost sub-circuit in the Ibex is engaged with its own footswitch and has a LED to indicate that it’s

engaged. The boost circuit is tied to the master footswitch, so the whole circuit is bypassed regardless of

whether it is in boost or fuzz mode.

However, there are competing opinions on what should be done with the boost indicator LED when the

whole unit is bypassed. Some playeers want to be able to know the boost status even when the unit is

bypassed, while others would expect that none of the LEDs would be illuminated in bypass mode.

The footswitch PCB has jumpers to select which type of operation you want it to have:

• If you expect the boost LED to be on when the boost circuit is enabled, even if the whole effect is

bypassed, then solder a jumper wire between the top and middle pads (marked “On”).

• If you expect the boost LED to be off when the effect is bypassed, even if the boost circuit is

internally engaged, then solder a jumper wire between the middle and bottom pads (marked “Off”).

IBEX SILICON FUZZ 6

SCHEMATIC

PCB

INPUT

OUTPUT

JACK

FROM

PCB

OUTPUT

FROM

INPUT

JACK

FROM

BOOST

OUTPUT

BOOST

INPUT

BOOST

PATH

FUZZ

PATH

FROM

BOOST

CONTROL

FROM

SUSTAIN

CONTROL

4k7

5MM

1N5817

100uF

GND

+9V

100n

100R

4k7

5MM

+9V

100kA

10k

GND

1uF

18k

2N5088

1k8

GND

100k

10k

100pF

10uF

47uF

GND

1uF

220k

GND

6n8

10k

47k

1uF

15k 100k

GND

2N5088

4n7

10k

1k5

GND

10uF

GND

1uF

15k 100k

GND

2N5088

OMIT

10k

1k5

GND

10uF

GND

1uF

33k

10k

2n2

47k

GND

100n

47k

2n2

22k

GND

68k

100kA

22n

GND

100kA

GND

25kB

INPUT

OUT

BOOST OUTPUT

PATH

BOOST

FUZZ

PATH

BOOST IN

CONTROL

BOOST

FROM

SUSTAIN

CONTROL

LEDR

LED

C18

FSA

FSB

FSC

C19

R26

LEDB

BOOST_LED

BOOST C

BOOST B

BOOST A

BOOST_LEVEL

SUSTAIN

R25

C17

R24

R11 R10

R13R12

R15 R14

C10

R17R16

C11

C12

R18

R20

C13

R19

C14

R21

C15

R22

TONE SELECT

R23

TONE

C16

VOLUME

MIDRANGE

GND

IBEX SILICON FUZZ 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.

ø3/8” ø1/2”

0.385”

0.625” 0.625”

ø3/8”

125B

OUT DC IN

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”

x: -0.765, y: -1.675

ø15/32”

x: -0.765, y: -1.675

ø15/32”

x: -0.95, y: -1.10

ø5/16”

x: +0.95, y: -1.10

ø5/16”

CENTER (0,0)

x: 0, y: +1.06

ø1/4”

0 1 2

0 1

INCH

IBEX SILICON FUZZ 8

ENCLOSURE LAYOUT

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

125B

IBEX SILICON FUZZ 9

WIRING DIAGRAM

125B

S.OUT L.OUTGNDB.ININ OUT B FFB

SUS

OUT

PCB

B.IN GND L.OUT

+V+V JACK GND JACK

OUTIN

OUT B FFROM

BOOST

IBEX SILICON FUZZ 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 cannotbe 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.

Projects may be used for commercial endeavors in any quantity unless specifically noted. No

attribution is necessary, though a link back is always greatly appreciated. The only usage restrictions

are that (1) you cannot resell the PCB as part of a kit without prior arrangement, and (2) you cannot

“goop” the circuit, scratch off the screenprint, or otherwise obfuscate the circuit to disguise its source.

(In other words: you don’t have to go out of your way to advertise the fact that you use these PCBs, but

please don’t go out of your way to hide it. The guitar effects industry needs more transparency, not less!)

DOCUMENT REVISIONS

1.0.0 (2021-10-22)

Initial release.

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