Lithium grim Omniwah Instruction Manual

OmniWah

Building instructions

v1.0

OmniWah v1.0

Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the

property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement

is implied.

Table of contents

PCB layout ............................................................................................................................................... 3

Build options............................................................................................................................................ 4

Vintage Wahs ...................................................................................................................................... 4

Modern signature Wahs...................................................................................................................... 4

Components ............................................................................................................................................ 5

Modifications........................................................................................................................................... 7

Mix and match..................................................................................................................................... 7

Sweep board........................................................................................................................................ 7

Mechanical Sweeprange mod ............................................................................................................. 7

Build sequence ........................................................................................................................................ 8

Off board wiring ...................................................................................................................................... 9

Potentiometers.................................................................................................................................... 9

Miniswitches.................................................................................Fout! Bladwijzer niet gedefinieerd.

Footswitches and stargrounding....................................................................................................... 10

Troubleshooting .................................................................................................................................... 11

Schematic .............................................................................................................................................. 12

Read this entire manual thoroughly before you start building the effect! There are some available

options and mods and you should choose which one you want to incorporate before starting your

build.

Last update: 10-12-2017

OmniWah v1.0

Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the

property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement

is implied.

PCB layout

Dimensions: 50 mm x 50 mm

1.97 inch x 1.97 inch

OmniWah v1.0

Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the

property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement

is implied.

Build options

This PCB can be used to mimic a wide range of vintage and modern wahs. In the components section

the following abbreviations will be used:

Vintage Wahs

Thomas: Thomas Organ CryBaby

Grey: Vox Grey Wah

V847: Vox v847 Wah

Color: Colorsound Inductor wah

Shin: Shinei Wah

BG-1: Maestro Boomerang Wah BG-1

Modern signature Wahs

JH-1: Dunlop JH-1 Hendrix Crybaby

ZW-45: Dunlop ZW-45 Wylde Crybaby

DB-1: Dunlop DB-1 Dimebag Crybaby

JC-95: Dunlop JC-95 Jerry Cantrell Crybaby

Omni: Modded Dunlop GCB-95 Crybaby

In the components section you will find the components needed for the different configurations.

When it says “jump”, there is no component to be place but instead you’ll need to connect both pad

of the component with a jumper wire (eg a spare piece of lead wire you get when cutting a resistor

to size). When it says “jump 1-2”, then you’ll need to connect pad 1 to pad 2 of the component with

a jumper wire. With “jump 2-3” you’ll need to connect pad 2 to pad 3 of the component with a

jumper wire.

A dash (“-“) means there is no component to be placed at that spot for that type of wah.

P1-P5 can be either an internal or external potentiometers. When you want to use the controls

during play, I suggest you make them external by using an Alpha 16mm pot meter. The pads are

marked accordingly to match the pins of the potentiometer. Else us a 6 mm PCB potentiometer.

P1 and P2 can be either a potentiometer or a single resistor depending on the type of wah you want

to build. Only for the Omni version you’ll need to add the potentiometer. For all other versions, you

can use the added special extra pads (marked in red below) on the board for the fixed (or jumped)

value resistor.

OmniWah v1.0

Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the

property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement

is implied.

Components

Thomas

Grey

v847

Color

Shin

BG-1

jump

4n7

10n

jump

3u9

4u7

10u

220n

200n

C10

220n

200n

C11

C12

C13

10n

30n

10n

jump

500mH

250mH

500mH

550mH

500mH

68k

100k

30k

47k

470R

510R

jump

470R

120R

Jump 2-3

P4*

B100k

B50k

B25k

Jump 1-2

Q2**

5517

BC150

MPSA18

BC184

2SC828

BC109C

Q3**

2N2925

BC150

MPSA18

BC167B

2SC828

BC109C

jump

1k5

1k6

1k2

22k

10k

470k

1M5

R10

82k

100k

R11

33k

100k

47k

R12

R13

620k

R14

R15

jump

1k2

jump

R16

10k

8k2

SW1

OmniWah v1.0

Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the

property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement

is implied.

JH-1

ZW-45

DB-1

JC-95

Omni

10n

22p

100n

jump

100u

10n

4u7

3u9

220n

22n

C10

220n

C11

C12

C13

10n

22n

10n

12n

10n

ZL9M3

500mH

535mH

500mH

68k

B100k

390R

470R

390R

B1k

Jump 2-3

B100k

P4*

B470k

B100k

Jump 1-2

B5k

B10k

MPSA13

Q2**

MPSA18

Q3**

MPSA18

2M2

1M8

10k

1k5

22k

470k

R10

82k

R11

82k

33k

10k

R12

R13

R14

R15

R16

10k

5k1

SW1

Capacitors with values < 1nF are MLCC, values of 1nF –1uF are SMF and all values > 1uF are

Electrolyte. “B” means linear for potentiometers.

NB Wah pot tapers (P4) are not always linear!!

OmniWah v1.0

Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the

property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement

is implied.

Modifications

Mix and match

You could mix a few options of different versions to get your own custom effect. I think it would be a

good idea to add R1 (pull down resistor) and P2 (Gain) to all types. This way you can reduce the pop

when switching on the effect and add a gain control that influence the tone of the wah.

Also consider to experiment with different types of transistors. The described transistors can be

replaced with any 300-400 Hfe NPN transistor.

Sweep board

A nice added feature can be to add a sweep board to replace C13. You can use a rotary switch for the

for example a 2P5T so you can switch between 5 different values. The example below is just for

reference. You can always use different values then mentioned in the picture.

.001

To PCB top C13

To PCB bottom C13

10nF 22nF 33nF 47nF 68nF

Mechanical Sweeprange mod

If you are using an old crybaby shell, then you might want to remove the rubber underneath the heel

of the wah plate. Also you might want to cut about half of the front 2 rubbers off. This way the

sweeprange of the wah will increase dramatically. But be careful not to remove too much. Maybe cut

in stages and test.

OmniWah v1.0

Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the

property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement

is implied.

Build sequence

Soldering this board can be very complicated for some people since the solder pads are very close

together. Use a magnifying glass to make the job easier. The trick to soldering a PCB is to work from

small to big components. My building sequence suggestions in this section are based on the parts I

used myself. Sometimes some components are smaller (or bigger) so always use your own common

sense and change the order accordingly. Usually capacitors can differ a lot in size depending on their

rating and value.

Note: Do not blow on your solder in an attempt to cool it down. That can result in a bad join that

might corrode!

Start by soldering the jumpers where needed. Next, solder the resistors and Zener diode.

If you want to experiment with other transistors then you could socket them instead of soldering

them to the board. You’ll need a some 20 SIL sockets, break off the sockets and solder them to the

board. Now is the time to solder these sockets on the PCB. Place the transistors only once you are

finished with all soldering and off board wiring!

Note: Orientation of the transistors vary for each different type you use. For this reason I marked the

pinout on the board for your convenience. I also added a graphic of the rounded side of the

transistor. This is based on the vintage transistors. Eg. a MPSA needs to be rotated 180 degrees!

Always consult the datasheet of the transistor and orient accordingly.

Now continue by soldering the small capacitors (MLCC) then the small SMF, trimpots and then the

Electrolytes. Finish with soldering the inductor.

I suggest you now drill the holes in your enclosure (maybe a spare old crybaby shell) so you can use it

during the off board wiring.

Note: Really take some time to determine where to place the pots, switches, jacks and PCB in the

enclosure before you start drilling. Measure twice, drill once.

You are almost ready to rock, well… not really. The difficult part starts now.

Besides the components mentioned in the components table, you will need:

2 input jacks. 2 mono jacks if you are not going to use a battery but only the 9V adapter. 1

mono (for output) and 1 stereo jack (for input) if you will be using both a 9V battery and the

9V adapter.

1 x 3PDT footswitch (9 pins)

2,1mm DC jack (isolated).

9v battery clip (optional).

22 gage stranded hook-up wire.

A LED holder. This enables you to mount the LED in the enclosure.

Wah enclosure (new or used).

OmniWah v1.0

Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the

property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement

is implied.

Off board wiring

Potentiometers

In the pictures below you see the correct pin numbering of the pots (Alpha 16mm style).

Solder the wires accordingly and it is always a good idea to twist the wires together to create a sort

of extra shielding against external noise.

You can break off the pin I marked with the yellow circle with a small pair of pliers.

P1 Volume

P2 Gain

P3 Voice

1 2 3

P4 Wah

P5 Sweep

OmniWah v1.0

Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the

property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement

is implied.

Footswitches and stargrounding

Ring

Sleeve

Tip

Sleeve

Cathode (short leg)

Anode (long leg)

R led

Note that R led is a 4k7 resistors. You can change this value depending on the type of LED you use

but 4k7 is safe enough for almost all LEDs @ 9V.

It is now time to place your transistors in the sockets if needed. Connect everything, build it in your

enclosure and enjoy your effect!

The sleeve on the output jack is not connected on purpose. Make sure the output jack is in good

electronic contact with the enclosure else you can try and connect the sleeves of the input and

output together. If you test the unit outside of an enclosure you need to connect the output sleeve

to ground!

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