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Summary of Contents for Oakley 3031 SuperBassLine
- Page 1 Oakley Sound Systems 3031 SuperBassLine User’s Guide V2.4 Tony Allgood B.Eng PGCE Oakley Sound Systems PENRITH CA10 1HR United Kingdom...
- Page 2 The legending has been made clearer and its easier to interface to the tbDAC too. This User Guide is for issue 2 of the 3031. The new issue is identical to the original issue 1 design but for the following changes: 1.
- Page 3 CV output to switch in slide, accent or even both. This makes control of the 3031 very easy to program even with something like a MC303 and the like. In fact, using the 3031 with the MC303 is a doddle because the four velocity pads can control slides and accents directly.
- Page 4 0.1s to 3s. 12. Power supply. The 3031 comes with a very low noise stable all analogue 723 based power supply. You will need a AC wall wart to power it, or you can fit an internal mains transformer if you know how to do it.
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Page 5: Operating Instructions
Operating Instructions The following will be a description of the pots and switches in the 3031. Refer to the diagram at the end of this document for a drawing of the front panel. Reading the front panel for the 3031 from left to right: TUNE: Alters the frequency of the VCO and thus tunes the whole instrument. - Page 6 VELOCITY CONTROL: This switch turns the velocity processor on or off. With it off, velocity has no control over the slides and accent modes of the 3031. When on, the velocity processor measures the value of the velocity CV and controls the synth accordingly.
- Page 7 1% 0.25W metal film resistors throughout, since these are very cheap nowadays. If you do want to use 5% types, the please note that some of the resistors in the 3031 have to be 1% or better types. Failure to use good quality parts in these locations will affect the VCO tuning stability and the stability of your outputs.
- Page 8 The 2SK30A-O is getting hard to find in large enough quantities, so I needed a substitute. The 3031 uses a J201 in place of the difficult to get 2SK30A-O. It has a different pin out, but its electrical performance is very similar. What’s more there is less variation between Idss in...
- Page 9 I do still use the 2SK30A-Y in the 3031. The Y types are still produced by Toshiba and are easily available. I also use the 2SK30A-GR too. This is used in the FET buffer for the new VCA circuit. A Y type may be used in its place, and either may be provided in the ‘odd parts’...
- Page 10 They simply push on, and friction holds them in place. Try not to bend the legs of the power devices when you push the heatsinks into place. If you are using the 3031 to power the tbDAC, then you are recommended to use heatsinks.
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Page 11: Parts List
Parts List I strongly advise you to read the Components section above before you place any order for parts. A quick note on European part descriptions. To prevent loss 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. - Page 12 470K R85, R24, R79, R78 R124, R2, R149, R68 R166, R156 R48, R61, R151, R45, R44 R143 R43, R112 R158, R170 82K 1% MF R8, R9* Capacitors 1000uF, 35V elect C54, C48 100nF, 63V polyester film C50, C52, C13, C44, C22, C19, C64, C71, C4, C34, C40 10nF, 100V polyester film 10nF 1% polystyrene 10uF, 35V elect...
- Page 13 1N4002 diode D26, D25, D22, D24 J201 J-FET 10V 400mW zener diode D11, D10, D9 2SK30A-GR or -Y J-FET 2SK30A-Y J-FET TIP31A NPN power Integrated Circuits You should consider IC sockets for all of the DIL ICs. You need six 14-pin DIL, and six 8-pin DIL sockets.
- Page 14 You may lose the component in this process, but you are far less likely to damage the PCB. The 3031 issue 2 PCB is flashed with solder around the pads. This helps the soldering process and keeps the board solderable for many years. Please note: this flashing is with solder that contains lead.
- Page 15 18W one for this purpose. I use an ordinary Antex 25W iron with a Variac power supply running at 205V. This seems to work well for me. All resistors, apart from the special PTC, should be flat against the board surface before soldering.
- Page 16 U6. You’ll need to preform the leads to do this. Then push the part into the holes marked PTC, solder and cut the leads form the underside of the PCB. Have a look at the two photographs on the 3031 webpage to see how I have done it.
- Page 17 bend the lead firstly near the body of the device at an angle of 45 degrees. Then where the metal leg thins, I bend it again so that it becomes parallel to the other two. The device should then fit snugly into place on the board. Whenever you need to bend legs of any semiconductor device be gentle.
- Page 18 I also have the tbDAC and internal mains transformer. This would require a case that is at least 25cm deep. If you are just fitting the 3031 PCB and a few sockets on the back, you could get away with a smaller depth case.
- Page 19 The recommended option is to use an insulated wallwart or AC adapter. These can be bought from most places and are used external to the 3031 housing. They are very safe since all the nasty dangerous stuff is kept inside the wall-wart. You won’t hurt yourself with the output from one of these unless you stick it in your mouth!! You need a 12V or 15V AC output at 250mA or higher rating.
- Page 20 The metal case MUST be earthed to safety earth via a suitably low resistance bonding strap or wire. It is advisable also to connect this safety earth to a spare GND pad on the 3031, or pin 2 on the tbDAC’s M-THRU header. This can be done via a wire link or a 1K resistor.
- Page 21 * The two wires from the AGND and DGND pad must be brought back separately to the one G1 pad on the 3031. The two wires will fit into one pad quite nicely. The 3031’s accent, filter and slide pads are left unused.
- Page 22 All those Trimmers Before you use your 3031 in a real musical situation, you need to set up the presets or trimmers. You will need a small precision screwdriver or a special trimmer adjustment tool. The latter is very useful to have, and it also features a side wall to stop the screwdriver falling out of place when you are adjusting the multiturn types.
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Page 23: Final Comments
Final Comments I hope you enjoy building the 3031. Please feel free to ask any further questions about construction or setting up. If you cannot get your project to work, do get in touch with me, and I will see what I can do. Sometimes, it can be the simplest things that can lay out a project.
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