Oakley Eurorack Modular Series Builder'S Manual Download

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Oakley Sound Systems

Eurorack Modular Series

Eight Step Sequencer

PCB Issue 1

Builder's Guide

V1.2

Tony Allgood
Oakley Sound Systems
CARLISLE
United Kingdom

Summary of Contents for Eurorack Modular Series

Page 1: ...Oakley Sound Systems Eurorack Modular Series Eight Step Sequencer PCB Issue 1 Builder s Guide V1 2 Tony Allgood Oakley Sound Systems CARLISLE United Kingdom...

Page 2: ...nd the calibration procedure please visit the main project webpage at http www oakleysound com sequencer e htm For general information regarding where to get parts and suggested part numbers please se...

Page 3: ...ks on the top and bottom surfaces of the board The surface mount components are all soldered to the top side of the board The second board is called the main board This holds the bulk of the sequencer...

Page 4: ...and off thus reducing unwanted noise on the power supply lines in your modular The two boards are fitted back to back to allow easy access to all the components Power is routed onto the main board via...

Page 5: ...oss of the small as the decimal point a convention of inserting the unit in its place is used eg 4R7 is a 4 7 ohm 4K7 is a 4700 ohm resistor 6n8 is a 6 8 nF capacitor Sequencer Main Board issue 1 Resi...

Page 6: ...5mm radial leads 1uF 63V electrolytic C16 4u7 63V electrolytic C50 C51 10uF 35V electrolytic C33 47uF 25V electrolytic C28 Discrete Semiconductors The following devices are surface mount parts 1N4148...

Page 7: ...10K multiturn trimmer T1A T2A T3A T1B T2B T3B 5K multiturn trimmer SCL_A SCL_B Miscellaneous Leaded ferrite bead L1 L2 2 x 5 0 1 boxed header STRIPE 2 x 8 0 1 boxed header EXP1 EXP2 4 way 0 1 SIL sock...

Page 8: ...ors connected together The commoned pin is labelled with a dot and must be put into the board so that the dot lines up with the square pad on the PCB Capacitors The following capacitors are surface mo...

Page 9: ...5mm round shafts 50K linear 9mm VR_A VR_B VR1A VR8A VR1B VR8B Switches C K D6R push switch SHIFT LOAD On Off On toggle switch GATE_1 GATE_8 STATE_1 STATE_8 MODE_1 MODE_7 OCT_A OCT_B On On toggle switc...

Page 10: ...1900H clones available from Thonk and others The two C K D6R tactile switches are available from Thonk as their C K Tactile switch You can get them in different colours but I prefer black The toggle...

Page 11: ...ge on the output of the op amp For example if all the pots on the sequencer were at their minimum one might expect the output of the sequencer to be exactly 0V However because of offset voltages in th...

Page 12: ...ldered from the top side Special care should be taken to ensure that each SIL socket sits at right angles to the board surface One way to do this is to temporarily fit the SIL headers into the SIL soc...

Page 13: ...t a 10 way 2 x 5 IDC boxed header Note the orientation of the notch in the side of the plastic housing You should also fill the two holes marked 0V and 5VA in the bottom right corner of the Main Board...

Page 14: ...ill be the pots Issue 1 of the Pot and Switch board has the two securing lugs holes for the pots a little further apart than perhaps they should be As such the pots should be fitted so that the three...

Page 15: ...board upright so that the washers do not fall off the switch threads Fit but not solder the push switches into place and ensure that the flattened edge of the switch aligns with the pattern on the cir...

Page 16: ...If you are using flat topped LEDs then you may wish to have them align with the top surface of the panel This is not a trivial task but one way is to use a bit of sticky tape over the holes and let th...

Page 17: ...top lead of the through hole resistor R30 It should measure somewhere between 11 0 and 11 5V If it is significantly less than this the current being taken from the digital parts of the circuitry is to...

Page 18: ...n the sequencer is reset back to the first available non skipped step Gate Output Test Put all the step mode switches back into the normal position and press the shift button enough times to light ste...

Page 19: ...back to how they were in the initialising stage Press load to set step 1 active Insert a patch lead into the CV Out A1 output socket and measure the voltage between the tip and sleeve connections at...

Page 20: ...any parts used and my time at 25GBP per hour Most faults can be found and fixed within one hour and I normally return modules within a week The minimum charge is 25GBP plus return postage costs If yo...