Electro-Harmonix EHX B9 Bedienungsanleitung

instructables

EHX B9 Organ Machine Modification

by giorgpasq1

(ehx B9) - When I was a little boy I was fascinated by an incredible musical instrument: the Godwin Organ-Guitar of

Peter Van Wood

(build in Italy by Sisme)

! I believe Peter represented the army of guitarists born in the analog jurassic

that looked at organists (yes organists, not keyboardists!) as the luckiest one that could play, sustain and modify

notes and chords forever!

A lot of attempts has been done to "imitate" the Organ (pipes or electronic) through the guitar (Roland, Casio...) but

the Elect ro Harmonix B9Ele ct ro Ha rmo nix B9 is, by far, the best one: simple, solid and addicting!

But there are few things that are missed...

In this project I modied a standard B9 (I believe that all the "9s" series of EHX are similar) to cover what I believe are

extremely useful features:

1. OLED DISPLAY: reading the position of the rotating switch is close to impossible in

live

situations, so a

nice bright Oled display is very welcomed to be visible and add some more info.

2. ROTARY ENCODER: a smoother encoder can be used for changing the preset and more.

3. PRESET FUNCTION: introduce a simple way to move between 2 dierent presets is essential to

introduce some fun in your playing!

4. MUTE/DRY FUNCTION: if you use a separate amp for the Organ OUT it's possible to avoid to have the

guitar signal there as well (Mute). This function is standard on the B9 but requires to open the unit

and move a microswitch: the rotary encoder can do it any time you want without open it.

5. LESLIE SPEED-UP FUNCTION: actually this is the original reason why I started to think to modify the

B9. There is no Organ Sound without Leslie! But the most fundamental use is to move from low-

speed to high-speed and back.

Supplies:

1. Arduino Nano Every

2. OLED Display IZOKEE 0.96" I2L 128X64 Pixel 2 colours

3. Rotary Encoder with push button (Cylewet)

4. Digital Potenziometer IC MCP42010

5. Multiplexer IC 74HC4067

6. 3 x Reed Relays SIP-1A05

7. Momentary stomp foot-switch push button

8. Double sided PCB (

Printed Circuit Board)

for DIY

9. .1uF ceramic capacitor (for MCP42010 lter)

EHX B9 Organ Machine Modification: Page 1

Step 1: What You Can Expect From Your Electro-Harmonix Modified...

The new features that the B9 will have:

OLED DISPLAY that shows the status of the unit:

1. OFFOFF the text is in reverse - O NON the text is normal

2. D ryD ry (

default

): organ and guitar are both present on "Organ OUT"

3. M ut eMut e : only organ is present on "Organ OUT", the guitar is Mute!

4. the eect selected by numbe rnum ber and de script io n: des cript ion: on the top in yellow a reference to the kind of

use of the eect like Deep Purple, Procol Harum, Jimmy Smith...- on the bottom the same (more or

less) description as the rotary switch

5. the kind of modulat io nkind o f modulat io n - Leslie/Vibrato/Tremolo

6. the spe edspe ed of MODULATION

7. the m odula t ion spe ed- upmodula t io n spe ed- up in progress scrolling from left to right the name of the selected eect

ROTARY ENCODER:

1. at power up the de fa ult se le ct iondef a ult se le ct ion is B9, meaning that the control of the eect is managed by the

B9 original rotary switch

2. rotating c lo ckw is eclo ckw is e to select eect 1, 2, 3...9, 1, 2, 3...

3. to return the control to B9 rotate it co unt e rclo ckw is eco unt erclo ckw is e ...3, 2, 1, B9 or...

4. ... press the ro t ary e nco der pus h but t o nro t a ry e ncode r pus h but t on to toggle between the selected eect and the B9

rotary switch selection: this is a simple way to move between 2 dierent pre se t s . 2 die rent pre se t s . (choosing a

taller rotary encoder facilitate to press it with your foot while you're playing! See the side picture)

EHX B9 Organ Machine Modification: Page 2

MUTE/DRY FUNCTION:

1. from OFF status move the rotary encoder counterclockwise to select eect 9

2. press the rotary encoder push button

3. the display will change from D ryD ry (default) to Mut eMut e

4. to go back to Dry remove the power and power up again!

LESLIE SPEED-UP FUNCTION:

1. to move from OFF to ON and viceversa press briey the foot-switch (we have to remove the existing

foot-switch and install a momentary push button)

2. select the LOW speed with the existing MOD potentiometer (you'll see the speed value on the

display)

3. press and keep pressed the foot-switch and the speed of the MOD will automatically progressively

increase to the MAX speed (100 on the display or less if you release it before 100 is reached) and

remain to the max until the foot-switch is pressed

4. release the foot-switch and the speed of the MOD will smoothly decrease up to the LOW speed

selected by the pot. MOD.

Ready to play A Whiter Shade of Pale?

EHX B9 Organ Machine Modification: Page 3

Step 2: Hardware...

EHX B9 Organ Machine Modification: Page 4

First of all, a disclaimer: I am an old-fashioned Electric

Engineer, maybe well capable to design a high

voltage distribution network and maybe sort of

capable to design and program a PLC controlled

equipment!

At University I used to program in Fortran on the

perforated cards, then in Basic and Assembler on the

Sinclair ZX80 (1Kb of memory...): practically I'm a

dinosaur!

Of course I like to play guitar and i like the sound of

organ: when I saw the B9 I was blown away!

To implement the speed-up function I thought to

simply add an external foot-switch that shortcuts the

MOD potentiometer to the max value or something

like the JHS modication that requires an external

expression pedal.

But I would like to reproduce the same feeling of the

organ player that is pressing a foot-switch and the

motor of the Leslie does the rest!

So I realised that some programming were needed:

time to learn this Arduino devilry!

Please be generous when you'll make comment on

the way I have developed the program (

I believe now

you call it "code"...

) and the hardware solution (

I use the

"electromechanical" approach

): I use all the resources

available on

i n s t r uc t a b l e si n s t r uc t a b l e s

and

A r d u i n oA r d u i n o

site and

I'll try to thanks the people that wrote the code I have

used to inspire me!

OK, let's talk about ha rdw areha rdw are .

Arduino Na no Ev eryArduino Na no Ev ery is controlling all the

functions:

INPUT

D2D2 Rotating Encoder -> pinA

D3D3 Rotating Encoder -> pinB

D4D4 Rotating Encoder -> push-button

D5D5 foot-switch: the standard foot-switch installed on

the B9 activates 3 contacts: opening the back of the

B9 you'll see the foot-switch connected to the PCB

(Printed Circuit Board) via a ribbon cable, the PCB

connection is marked CN2 and you can numbered the

EHX B9 Organ Machine Modification: Page 5

connections 1 (close to CN2 mark) to 6.

In OFF position the contact 3-4 is closed, in ON

position 5-6 is closed, in Dry selection 2-6 is closed.

You have to remove the existing foot-switch and

install a new simple momentary push button and

manage the 3 contacts though 3 relays.

I have used reed relays: small, stable contact and

cheap! In the Fritz schematics I couldn't nd the reed

relay SIP-1A05 so I used the most similar one. In the

pictures attached you'll see that the reed relay has

only 4 pins (instead of the 8 pins in the schematic): the

external ones are the contact, the inner ones the coil.

I've tried the digital switches CD4066 and the TM1134

but the On-resistance and probably the impedance

generate some distortion and "sound leakage" on

Mute position. So I went back on my

electromechanical approach that works noiseless!

A7A7 the pins of the potentiometer MOD (marked VR1

on the PCB) have to be cut (so disconnected from the

PCB) and connected to Nano: the pin on the min. to

the 5V - the pin on the MAX. to GND - the central pin

wiper to analog input A7

OUTPUT

D6D6 contact 3-4 (close is B9 is OFF)

D7D7 contact 2-6 (close is B9 is in Dry mode)

D8D8 contact 3-4 (close is B9 is ON)

D10D10 on the digital potentiometer MCP 42010 to CS

(pin1)*

D11D11 on the digital potentiometer MCP 42010 to S1

(pin3)*

D13D13 on the digital potentiometer MCP 42010 to SCK

(pin2)*

* on the breadboard schematic the digital potentiometer

chip is visualised by a generic 14pins IC with a trimmer

overlapping the pins 8-9-10. This is only a graphic

representation: you don't need anything else than

MCP42010.

A0A0 on the multiplexer 74HC4067 to S3

A1A1 on the multiplexer 74HC4067 to S2

A2A2 on the multiplexer 74HC4067 to S1

A3A3 on the multiplexer 74HC4067 to S0

A4A4 on the OLED display on SDA

A5A5 on the OLED display on SCL

POWER SUPPLY

VINVIN connect the Nano Vin to the +9V on the B9

socket: you can see from the pictures the pin that I

choose but be careful and check with the multimeter

the correct pin!

MULTIPLEXER

In order to double the function of the rotating switch

to select one of the 9 dierent organ eects, I have

used the rotating encoder that can (sort of ) easily

inform Arduino about directions. Then you need to

physically duplicate the existing rotary switch to

inform the B9 of which eect to select. My rst

prototype worked with 10 relays (I have attached a

picture to prove it!). Then I realised that it was a little

too much and, even if I was scared of this mystied

device, I bravely faced the multiplexer world and... I

succeed!

The multiplexer 74HC4067 is capable of 16 positions. I

have used position C0C0 to connect to the common pin

of the rotating switch (you have to cut and isolate the

pin marked "C" from the PCB and connect it to the C0

on the multiplexer): in this way you can "give back' the

control to the rotating switch when needed (...as a

preset!).

The other positions C1.. .C9C1. .. C9 have to be connected to

the 9 pins of the rotating switch: the easiest way is to

use the opposite side of the PCB (I have attached a

picture but, again, pay attention to nd the right

ones!)

I hope that with the help of the breadboard Fritz

schematic and some hints from the pictures, you can

EHX B9 Organ Machine Modification: Page 6

realise a cleaner PCB for the few components needed.

1. connect to CO of multiplexer

EHX B9 Organ Machine Modification: Page 7

EHX B9 Organ Machine Modification: Page 8

Step 3: ...& Software

https://www.instructables.com/ORIG/FBN/IUWI/KFFEDHKG/FBNIUWIKFFEDHKG.pdf

Download

EHX B9 Organ Machine Modification: Page 9

Step 4: Fit the Arduino Nano Every in the B9 Box

The code is a result of many inspirations from

instructables and Arduino sites. As I said, I learned

C++ just to be capable to do this project and my

approach is quite plain: I'm sure someone can write a

much more well-constructed code...

You'll notice that some piece of code are placed not in

the most logical position, this is because of my

successive-approximations way to x some problem!

First part is to variables and constants declaration (I

hope the comments are self explanatory): I added as

well the original description of the eect from the B9

manual.

The part related to the dig it a l po t e nt io me t er digit a l po t e nt io me t er has

been inspired by Henry Z haoHenry Z hao

https://wiki.dfrobot.com/Dual_Digital_Pot__100K__...

The part related to the mult iple xe rmult iple xe r has been

inspired by pmdwa y hkpmdwa y hk

https://www.instructables.com/id/Tutorial-74HC406...

that I re-adjusted for Arduino Nano Every.

The part related to the ro t a t ing e nco der ro t a t ing enco der has been

inspired by

Simo nM8Simo nM8 https://www.instructables.com/id/Improve

d-Arduino... : it has been hard to adapt to Arduino

Nano Every but... I did it after Simon's encouragement!

For the double f unct ions pus h but t ondouble f unct ions pus h but t on I've been

inspired by S cuba St ev e S cuba St e v e and M icha el Jam es M ichae l Ja me s

https://www.programmingelectronics.com/make-one-

b...

...and the rest (it seems a little but it's a lot for me) I

did it!

I believe that there are enough comments to explain

how the software works: I'll be happy to help if

someone nd some diculty to interpreter it.

https://www.instructables.com/ORIG/FV7/2AHL/KFFEDHDV/FV72AHLKFFEDHDV.fzz

Download

https://www.instructables.com/ORIG/F07/K9BU/KFFEDHHP/F07K9BUKFFEDHHP.ino

Download

EHX B9 Organ Machine Modification: Page 10

Inhaltsverzeichnis

Andere Electro-Harmonix Musikpedal Handbücher

Electro-Harmonix

Electro-Harmonix SOUL FOOD Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix Triangle Big Muff Pi Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix Q-TRON Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix NANO LOOPER 360 Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix Q-Tron Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix DELUXE ELECTRIC MISTRESS Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix Lizard Queen Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix Grand Canyon Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix TONE TATTOO Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix PLATFORM Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix Superego+ Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix Blurst Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix BASS CLONE Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix nano SMALL STONE Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix HOG GUITAR SYNTHESIZER Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix V256 Vocoder Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix NEXT STEP Series Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix Satisfaction Plus Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix THE ANALOGIZER Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix NANO OPERATION OVERLORD Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix HOLY GRAIL MAX Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix MEL9 Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix Super Pulsar Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix NANO POG Bedienungsanleitung

Beliebte Musikpedal Handbücher anderer Marken

Behringer

Behringer ULTRA WAH UW300 Bedienungsanleitung

Whirlwind

Whirlwind oc-bass Bedienungsanleitung

Strymon

Strymon Lex-rotary Bedienungsanleitung

Behringer

Behringer PB600 Bedienungsanleitung

Lexicon

Lexicon MX200 Bedienungsanleitung

Dunlop

Dunlop Hendrix 68 Shrine Octavio Fuzz Series Bedienungsanleitung

Matthews Effects

Matthews Effects Whaler V2 Bedienungsanleitung

Grid 1

Grid 1 Pedal Jeanie Bedienungsanleitung

Amptweaker

Amptweaker tightboost Bedienungsanleitung

Ibanez

Ibanez TS-808 Tube Screamer Overdrive Pro Bedienungsanleitung

Dimavery

Dimavery EPVP-50 Bedienungsanleitung

Tefi Vintage Lab

Tefi Vintage Lab GEGÈ Bedienungsanleitung

Pro-MIDI

Pro-MIDI G25 Bedienungsanleitung

DW 7000 Bedienungsanleitung

FAMC

FAMC Liquid-Foot Jr. Series Bedienungsanleitung

Dimavery

Dimavery EPOD-50 Overdrive Bedienungsanleitung

TREX

TREX ToneBug Totenschläger Bedienungsanleitung

BBE

BBE ORANGE SQUASH Bedienungsanleitung