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Lithium Grim OmniWah, Инструкция по сборке

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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.

 

16 

Wahpot calibration 

If you feel that your wah is not changing over the full sweep, then you will need to calibrate your 
wahpot. You can do this by loosening the tension clutch (the white plastic thingy pushing against the 
rack gear) until you can push it aside enabling you to pull back the rack gear from the wahpot. Do not 
totally unscrew it! 

 

 

 

 

 

 

 
Connect your wah to your guitar and amp (and power if needed). Push the rack gear against to the 
teeth of the wah pot ensuring the gears fall in to place without using force, and rock the wah to find 
out at which end (heel or toe) there is too little change in the wah sound. Once you find it, push back 
the rack gear and just slightly adjust the wah 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 there is too little action in the toe position. I start by pushing the rocker in 
the most extreme toe position, clicking the footswitch. I pull the rack gear back, turn the wahpot in 
the most extreme toe position and turn it back 2 teeth on the wahpot. I push back the rack gear to 
the wahpot and test it again. If there is still not enough action in the toe position I repeat this and 
turn the wahpot 1 tooth further. At this point you should always check that in the heel position you 
still have enough gears left so it does not slip in the heel position. Repeat as many times as possible.  
Do not forget to refasten the tension clutch once you are done. 

If you still do not get the desired sweep then it is time to look at a different taper wahpot! 

 

 

Rack gear 

Tension clutch 

Содержание OmniWah

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

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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