Aion TEMPEST Manuel utilisateur

TEMPEST AMP DISTORTION 1

PROJECT NAME

TEMPEST

BASED ON

EFFECT TYPE

PROJECT SUMMARY

DOCUMENT VERSION

Friedman®BE-OD / Dirty Shirley

A pedal recreation of the Friedman®BE-100 and Dirty Shirley amplifiers.

Amp-Like Distortion 1.0.1 (2019-03-08)

BUILD DIFFICULTY

Intermediate

Actual size is 2.3” x 2.42” (main board) and 1.78” x 0.86” (bypass board).

TEMPEST AMP DISTORTION 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 Tempest Amp Distortion is a combination of the Friedman®BE-OD and Dirty Shirley pedals, two

very similar circuits that were designed to emulate high-gain amplifiers.

It’s not a true amp emulator of the sort that replace the tubes with JFETs, as Runoffgroove is famous

for. Instead, it’s fully driven by op-amps, but very carefully designed in a way to mimic the response and

character of a Friedman amplifier. And by all accounts it has succeeded, quickly becoming one of the

most revered “amp in a box” pedals on the scene today.

The original Friedman BE-OD is missing a midrange control, while the Dirty Shirley has a midrange

control but converts the Tight knob into a toggle switch. The Tempest project combines these together,

preserving the midrange control while also leaving the Tight control as a knob instead of a switch, for a

total of seven knobs.

USAGE

The Tempest has the following controls, which correspond to the same controls on the BE-100 or Dirty

Shirley amplifiers.

• Gain is the overall distortion or drive level of the effect.

• Volume controls the overall output of the effect.

• Presence is low-pass filter that sets the high-end cutoff frequency between 1.3 KHz and 7.2 KHz.

• Tight is a high-pass filter that sets the low-end cutoff frequency between 150Hz and 3.3 KHz near

the beginning of the circuit.

• Bass, Mid and Treble form a 3-band EQ. These controls are all at different stages in the circuit, so

they are not interactive with each other in the same way that a Marshall or Fender-style tonestack

would be.

TEMPEST AMP DISTORTION 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 330k Metal film resistor, 1/4W

R2 10k Metal film resistor, 1/4W

R3 22k Metal film resistor, 1/4W

R4 39k Metal film resistor, 1/4W

R5 4k7 Metal film resistor, 1/4W

R6 10k Metal film resistor, 1/4W

R7 22k Metal film resistor, 1/4W

R8 22k Metal film resistor, 1/4W

R9 22k Metal film resistor, 1/4W

R10 220k Metal film resistor, 1/4W

R11 22k Metal film resistor, 1/4W

R12 27k Metal film resistor, 1/4W

R13 10k Metal film resistor, 1/4W

R14 2k2 Metal film resistor, 1/4W

R15 33k Metal film resistor, 1/4W

R16 33k Metal film resistor, 1/4W

R17 2k2 Metal film resistor, 1/4W

R18 470k Metal film resistor, 1/4W

R19 2k2 Metal film resistor, 1/4W

R20 2k2 Metal film resistor, 1/4W

R21 22k Metal film resistor, 1/4W

R22 100k Metal film resistor, 1/4W

R23 2k2 Metal film resistor, 1/4W

R24 10R Metal film resistor, 1/4W Power supply filtering resistor.

R25 20k Metal film resistor, 1/4W

R26 22k Metal film resistor, 1/4W

R27 2k2 Metal film resistor, 1/4W

R28 20k Metal film resistor, 1/4W

R29 22k Metal film resistor, 1/4W

R30 2k2 Metal film resistor, 1/4W

TEMPEST AMP DISTORTION 4

PARTS LIST, CONT.

PART VALUE TYPE NOTES

RPD 2M2 Metal film resistor, 1/4W Input pulldown resistor. Can be as low as 1M.

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

C1 22n Film capacitor, 7.2 x 2.5mm

C2 47pF MLCC capacitor, NP0/C0G

C3 10n Film capacitor, 7.2 x 2.5mm

C4 1n Film capacitor, 7.2 x 2.5mm

C5 47pF MLCC capacitor, NP0/C0G

C6 100n Film capacitor, 7.2 x 2.5mm

C7 47n Film capacitor, 7.2 x 2.5mm

C8 120pF MLCC capacitor, NP0/C0G

C9 220pF MLCC capacitor, NP0/C0G

C10 10n Film capacitor, 7.2 x 2.5mm

C11 4n7 Film capacitor, 7.2 x 2.5mm

C12 22n Film capacitor, 7.2 x 2.5mm

C13 220n Film capacitor, 7.2 x 2.5mm

C14 2n2 Film capacitor, 7.2 x 2.5mm

C15 10n Film capacitor, 7.2 x 2.5mm

C16 220n Film capacitor, 7.2 x 2.5mm

C17 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor.

C18 100n MLCC capacitor, X7R Power supply filter capacitor.

C19 22uF Electrolytic capacitor, 5mm Reference voltage filter capacitor.

C20 100n MLCC capacitor, X7R Reference voltage filter capacitor.

C21 22uF Electrolytic capacitor, 5mm Reference voltage filter capacitor.

C22 100n MLCC capacitor, X7R Reference voltage filter capacitor.

D1 1N5817 Schottky diode, DO-41

D2 3mm LED, 3mm, red diffused

D3 3mm LED, 3mm, red diffused

D4 1N914 Fast-switching diode, DO-35

D5 1N914 Fast-switching diode, DO-35

D6 1N914 Fast-switching diode, DO-35

D7 1N914 Fast-switching diode, DO-35

D8 3mm LED, 3mm, red diffused

D9 3mm LED, 3mm, red diffused

TRIM 100k trimmer Trimmer, 10%, 1/4” Adjusts the overall gain range of the effect.

TEMPEST AMP DISTORTION 5

PARTS LIST, CONT.

PART VALUE TYPE NOTES

IC1 TL072 Operational amplifier, DIP8

IC2 TL072 Operational amplifier, DIP8

IC3 TL072 Operational amplifier, DIP8

IC4 TL072 Operational amplifier, DIP8

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

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

IC3-S DIP-8 socket IC socket, DIP-8

IC4-S DIP-8 socket IC socket, DIP-8

BASS 100kC 16mm right-angle PCB mount pot

TREBLE 100kB 16mm right-angle PCB mount pot

MID 100kC 16mm right-angle PCB mount pot

PRES. 10kC 16mm right-angle PCB mount pot

TIGHT 100kC 16mm right-angle PCB mount pot

GAIN 1MA 16mm right-angle PCB mount pot

VOL. 50kA 16mm right-angle PCB mount pot

LED 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.

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

FSW 3PDT Stomp switch, 3PDT

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

TEMPEST AMP DISTORTION 6

BUILD NOTES

Circuit architecture

This circuit has several cascaded gain & clipping stages, but overall it’s pretty linear without a lot of

interaction between the sections. Here is a block diagram of how the circuit is arranged:

Setting the gain trimmer

The circuit has an on-board internal trimmer to adjust the overall gain range of the circuit. This is

different from the external gain control. As you can see in the block diagram above, this gain stage

comes after the two soft-clipping stages, but before the final hard-clipping stage. It’s a simple op-amp

stage that boosts or cuts the signal going into the hard clipping stage, so it primarily impacts the amount

of hard clipping.

At its stock setting of 12:00, the pedal could be considered a medium-gain drive. By turning it up, you

can shift it into the mid-to-high gain range.

Conversely, by turning it down, you can have better control over the low gain range, but the pedal will

lack the high-gain tones that you might expect from it.

INPUT TIGHT

(LOW CUT)

PRESENCE

(HIGH CUT)

VOLUME

GAIN /

SOFT CLIP

HARD CLIP

MID

GAIN

TRIMMER

BASS

SOFT CLIP

TREBLE

OUTPUT

SCHEMATIC

TEMPEST AMP DISTORTION 7

GND

100uF

100kC

10kC

GND

100kC

100kB

100kC

50kA

+9V

22n

330k

1N5817

10k

47pF

10R

GND

100n

1MA

TL072P

22k

39k

GND

10n

4k7

VRVR

10k

GND

47pF

22k

GND

22k

100n

GND

LED

47n

22k TL072P

220k

22k

GND

120pF

1N914 1N914

1N9141N914

27k TL072P

10k

220pF

100kB

2k2

10n

GND

20k

2k2

22k

GND GND GND

100n

20k

2k2

22k

GND GND GND

100n

4n7

GND

TL072P

22n

33k 33k

220n

GND

2k2

470k

2k2

GND

TL072P

2n2

2k2

22k

10n

GND

220n

100k

2k2

GND

22uF22uF

RPD

C17

TIGHT

PRESENCE

MID

TREBLE

BASS

VOLUME

OUT

R24

C18

GAIN

IC1A

IC1B

IC2A

IC2B

C6 D2

IC3A

R10

R11

D4 D5

D6D7

R12

IC3B

R13

TRIM

R14

C10

R25

R27

R26

C20

R28

R30

R29

C22

C11

IC4A

C12

R15 R16

C13

R17

R18

R19

IC4B

C14

R20

R21

C15

C16

R22

R23

C21C19

GND

TEMPEST AMP DISTORTION 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 requires the use of closed-frame jacks like the Switchcraft 111X. Open-frame jacks will

not fit in layouts with 5 or more knobs due to the placement of the DC jack.

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

ø3/8” ø1/2”

0.385”

0.625” 0.625”

x: -0.775, y: +1.71 x: +0.775, y: +1.71

ø9/32” ø9/32”

x: 0, y: +0.535

ø9/32”

x: +0.775, y: +0.535

ø9/32”

x: 0, y: -1.775

ø15/32”

x: -0.775, y: -1.775

ø5/16”

CENTER (0,0)

ø3/8”

125B

OUT

VOLUME

x: 0, y: +1.71

ø9/32”

PRESENCE

x: 0, y: -0.64

ø9/32”

TIGHT

GAIN

MID

x: -0.775, y: +0.535

ø9/32”

TREBLE BASS

FOOTSWITCHLED

DC IN

TEMPEST AMP DISTORTION 9

ENCLOSURE LAYOUT

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

125B

TEMPEST AMP DISTORTION 10

WIRING DIAGRAM

125B

IN +VGND NC NC OUT

PCB

GND +V +V JACK GND JACK

OUTIN

GND GND PCB

OUT

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