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OmniScreamer

Building instructions

v1.0

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Содержание OmniScreamer

Страница 1: ...OmniScreamer Building instructions v1 0 ...

Страница 2: ...nt is implied 2 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 11 Troubleshooting 11 Schematic 12 Read this entire manual thoroughly before you start building the effect There are some available options and you should choose which one you w...

Страница 3: ...tification 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 49 5 mm x 49 5 mm 1 95 inch x 1 95 inch Soldermask mistake Should be D5 ...

Страница 4: ...built to fit almost all types of tone controls as found in a lot of tubescreamer based effects The power section is not that interesting but some versions use an a symmetrical voltage divider to form Vref The only non standard is that the polarity protection is changed to a safer serial connection This has no tonal effect what so ever The optional mods 1 Boost 2 Offboard Clipping diodes 3 Feedback...

Страница 5: ...Capacitors 1nF 1uF are MKT Wima SMF which ever you prefer unless stated otherwise in the sheet 4 Capacitors 1u and bigger are Electrolytic and rated 25V unless stated otherwise in the sheet 5 SW1 and SW4 buffers can best be miniature PCB mounted DPDT on on switches 6 SW2 onboard diode selection is normally a DIP 2 If the sheet says jump you need to short both poles like this 7 SW3 Boost is a stand...

Страница 6: ... can create a jumper using a spare piece of lead from a resistor or diode If you want to experiment with other transistors for Q1 and Q2 then you could socket them instead of soldering them to the board You ll need a some 20 SIL sockets break off the 3 pin sockets and solder them to the board Now is the time to solder the socket for the IC Place the transistors and IC once you are finished with al...

Страница 7: ...d 7 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 The rectangle pad marks pin 1 You can break off the pin I marked with the yellow circle with a small pair of pliers Main bypass wiring Ring...

Страница 8: ...ED 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 It requires very good conductivity between the input jack output jack and the enclosure to work correct If you do not have good conductivity please connect a wire between the input jack sleeve and the output jack sleeve Boost wi...

Страница 9: ...g 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 There are so many combinations possible and that is why there is a whole page committed to all kinds of combinations Feel free to experiment and combine all kinds of diodes If you...

Страница 10: ...uct 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 10 ...

Страница 11: ...ld an effect to double check so there should not be a connection problem on the PCB itself The board is not working at all what now Check if your 9V is plugged in correctly and or soldered correctly on the board Pay special attention to the polarity Check that you 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...

Страница 12: ...ames 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 12 Schematic ...

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