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Lithium Grim OmniWah, Building Instructions

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Lithium Grim OmniWah Building Instructions Download Page 17

OmniWah v2.0 

 

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.

 

17 

Color coding headers 

 

Dunlop Crybaby Pre 1990 

 

 

 

 

 

Orange

 : DC Jack + 

 

 

 

 

 

Black  : DC Jack Ground

 

 

 

 

Brown

  : Tip Input Jack (To PCB In) 

 

 

 

 

Green

  : Switch In (shorts with 

Brown

)

   

 

 

Yellow

  : Wah Pot lug 2  

 

 

 

Blue 

  : Wah Pot lug 3  

 

 

 

White

  : 

Sleeve Input Jack (Ground)

 

 

 

 

Black  : Battery - 

Purple

  : Ring Input Jack 

 

Dunlop Crybaby Post 1990 (PCB mounted jacks) 

 
Black  : Battery - 

Red

 

: B 

Black  : Ground 

Green

  : Switch In (To PCB Jack In) 

Yellow

  : Wah Pot lug 2 

Blue 

  : Wah Pot lug 3 

Purple

  : Switch out (to Tip Output Jack) 

 
 
 

Vox 

 

Brown

  : Tip Input Jack (To PCB In) 

Green

  : Switch In (shorts with 

Brown

)

 

 

Yellow

  : Wah Pot lug 2 

Blue 

  : Wah Pot lug 3 

White

  : 

Ring Input Jack  

Black  : Battery - 

Red

 

: B 

Purple

  : Sleeve Output Jack (Ground) 

 
 
 
 
 

 

Summary of Contents for OmniWah

Page 1: ...OmniWah Building instructions V2 0 ...

Page 2: ...ors 6 Configuration note 7 Modifications 7 Mix and match the configurations 7 Sweep board 7 Mechanical Sweeprange mod 8 Outputbuffer 8 R17 Cantrell mod 8 Build sequence 9 Errata 9 The build 9 Off board wiring 13 Potentiometers 13 Footswitch with PCB mounted input and output 13 Footswitch with external input and output 14 Switch installation 15 Wahpot calibration 16 Troubleshooting 17 Schematic 19 ...

Page 3: ...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 3 PCB layout Dimensions 74 mm x 75 mm 2 91 inch x 2 95 inch ...

Page 4: ...Wahs Dunlop JH 1 Hendrix Crybaby ZW 45 Wylde Crybaby DB 1 Dimebag Crybaby JC 95 Jerry Cantrell Crybaby GCB 100 Bass GCB 95 BBE Ben Wah Axis Wah Custom 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 jumpe...

Page 5: ...e feel free to send me feedback Inductor I think this is the most important part to invest in You can go 2 ways on this First you could buy the major brand ones from eg Dunlop or Vox but changes are you will not get to the tonal characteristics of your configuration unless it is a modern Dunlop or Vox you want Next you can buy a real vintage one You will have a very hard time finding a genuine vin...

Page 6: ...gree with me None the less the value and tolerance of these components influence the sound greatly Components have a spread in their values Every part is sold with these values inside a certain tolerance Carbon Composite are 5 while metal film mostly are 1 Capacitors are even worse Generally the tolerance is about 10 but can also be 5 or even 20 It depends This is only one of the reasons that no 2...

Page 7: ...or on the wire connected to the footswitch and IN on the PCB Note that P1r and P2r are just a fixed value resistor instead of P1 and P2 See the configuration sheet when to use which Modifications Mix and match the configurations 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 ...

Page 8: ...ional output buffer It is not specific to any build and can be used with any configuration If you want to incorporate the buffer you will need to solder C14 C15 P6 Q4 R18 R19 and SW2 Note that SW2 consists of 2 parts SW2A and SW2B Pins 3 and 6 are not on the PCB and should be shorted on the switch itself like this Also note that if you are not planning of implementing the buffer then you should le...

Page 9: ...g 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 ...

Page 10: ...e small capacitors MLCC then the small SMF trimpots and then the Electrolytic capacitors 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 Try to keep wires as short as possible Note Really take some time to determine where to place the pots switches jacks and PCB in the enclosure bef...

Page 11: ...t is out of sync You can do a couple of things First start by inserting the input jacks and DC jack in the PCB WITHOUT SOLDERING THEM TO THE PCB Put everything in the prepared enclosure and insert the jack screws and pcb screws so you can have a good look at the fit PCB input jacks do differ somewhat per brand and if the PCB fits to tight the use a small file and file the plastic case carefully an...

Page 12: ...picture below the horizontal alignment is good but it might be a bit too low You can either use a plastic washer under the PCB or you can solder the DC jack with a small gap between the PCB and the jack To check this insert the DC jack in the DC input and determine the gap height Make sure there is no pressure on the DC jack after inserting the jack PS It is always good to check that none of compo...

Page 13: ...m enclosure 1590BB Potentiometers In the pictures below you see the correct pin numbering of the pots Alpha 16mm style and or onboard 6mm 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 Footswitch with PCB mounted inp...

Page 14: ...leeve Tip 1k only for BBE Ben Wah R Led As the onboard DC jack is not installed you will need to connect 2 DC pins on the board like this 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 t...

Page 15: ...hor No cooperation or endorsement is implied 15 Switch installation I usually put switches to the side of the crybaby enclosure by drilling a hole until Ulrich pointed me out that you could use a short shaft switch just underneath the rocker of your Wah This way you will prevent breaking off the switch when you accidentally slip off or miss Take a look at the pictures below and you ll notice it wi...

Page 16: ...gear by turning the wah pot It is important that you try to do this just 1 tooth at a time else you will overshoot the sweet spot before you know it Also be careful to not overturn the wahpot in either of the extreme directions of the rack gear This could cause the gears slip and break after a while as the rocker has more motion than the gears and teeth will allow This is how I start Let s say the...

Page 17: ...und Brown Tip Input Jack To PCB In Green Switch In shorts with Brown Yellow Wah Pot lug 2 Blue Wah Pot lug 3 White Sleeve Input Jack Ground Black Battery Purple Ring Input Jack Dunlop Crybaby Post 1990 PCB mounted jacks Black Battery Red Battery Black Ground Green Switch In To PCB Jack In Yellow Wah Pot lug 2 Blue Wah Pot lug 3 Purple Switch out to Tip Output Jack Vox Brown Tip Input Jack To PCB I...

Page 18: ...ou oriented the capacitors IC s transistors and diodes the right way SMF MKT and ceramic capacitors as well as resistors do not need to be oriented A likely sign of incorrect capacitors and or orientation is when an effect is sputtering rumbling or motorboating Check if you used the correct values of the components For resistors you can look here http www diyaudioandvideo com Electronics Color Dou...

Page 19: ...s 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 19 Schematic ...

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