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Summary of Contents for Lithium Grim OmniScreamer
- Page 1 OmniScreamer Building instructions v1.0...
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Page 2: Table Of Contents
OmniScreamer v1.0 Table of contents PCB layout ............................... 3 Introduction ............................. 4 Configurations and components ......................5 Pots ..............................5 Build sequence ............................6 Off board wiring ............................7 Potentiometers............................ 7 External Diodes configuration ......................9 Modifications ............................8 OpAmp ............................... 11 Transistors ............................ -
Page 3: Pcb Layout
OmniScreamer v1.0 PCB layout Dimensions: 49,5 mm x 49,5 mm Soldermask mistake! Should be D5 1,95 inch x 1,95 inch 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... -
Page 4: Introduction
OmniScreamer v1.0 Introduction Before we start with the component list, it might be interesting to know how this PCB was designed. Strictly speaking, you can break down this tubescreamer into 5 main sections and 3 optional mods. The main sections are: 1. -
Page 5: Configurations And Components
OmniScreamer v1.0 Configurations and components This PCB can be configured to become a wide range of Tubescreamers. The components needed to build these configurations can be found in the separate configuration sheet. If you are not sure which type of components you need to buy, you can follow this list: 1. -
Page 6: Build Sequence
OmniScreamer v1.0 Build sequence Before starting with this section, make sure you have read the configurations section first! 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. -
Page 7: Off Board Wiring
OmniScreamer v1.0 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 some extra shielding against external noise. - Page 8 OmniScreamer v1.0 Rled can be somewhere between 1k5 and 10k (try 4k7). The lower the value the brighter the LED shines, but at the cost of power consumption and wear of the LED. The diagram is also based on star wiring where all ground connections go to the sleeve of the input jack.
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Page 9: External Diodes Configuration
OmniScreamer v1.0 External Diodes configuration The wiring for the SW5 switch is the same as for potentiometers, marking pin 1 with a rectangle pad. There is no wrong way to wire it as long as the middle lugs of the DP3T are connected to one of the pads like this: The optional diode switch (SW5) enables you to switch between 2 sets of diodes. - Page 10 OmniScreamer 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.
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Page 11: Modifications
OmniScreamer v1.0 Modifications OpAmp Almost all types of dual OpAmps can be used as long as the pinout is the same. Just a few that have been tested with success (meaning, they sound good). JRC4558(P), JRC4559, OPA2134, TL072, TL082, JRC 1458, AD712, OPA2604. -
Page 12: Schematic
OmniScreamer v1.0 Schematic 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...
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