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Summary of Contents for Oakley TM3030
- Page 1 Oakley Sound Systems TM3030 PCB Issue 1 User manual & Builder's Guide V1.2 Tony Allgood Oakley Sound Systems CARLISLE United Kingdom...
- Page 2 Sequencer and midibass TB303 midi interface. By careful analysis of the original unit, Sequentix have created a midi interface that allows the TM3030 to behave as the original unit would if you could feed it midi messages. Slides and accents are faithfully reproduced.
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Page 3: Power Supply
18V. If you can't calibrate the TM3030's internal 5.33V supply then it is likely the power pack is not producing a high enough voltage. - Page 4 C16 should be adequately rated for the input voltage you are using. ie. At least equal to 1.4xVac. Where Vac is the maximum output RMS voltage of the transformer. Line fuse: T250mA All parts of the metal case MUST be earthed to mains safety earth via a suitably low resistance bonding strap or wire.
- Page 5 GATE LED: Lights green when an active gate is present. Not all midi notes are recognised by the TM3030. The unit has only a six bit digital to analogue convertor (DAC) which is identical in design to the one in the original device. Therefore, only half of all the 127 midi...
- Page 6 TM3030. The lowest note that is played is C3 (where middle C is C4), lower notes that this are ignored. VCF DECAY: Controls the time it takes for the filter envelope to decay down to zero. From ‘dit’...
- Page 7 Buying Your Electronic Components Most of the parts, but not all, are easily available from your local parts stockist. I use Rapid Electronics, RS Components, and Farnell here in the UK. In North America, companies called Mouser, Newark and Digikey are very popular. In Germany, try Reichelt, and in Scandinavia you can use Elfa.
- Page 8 0.25W metal film resistors for all my general purpose resistors, since these are very cheap nowadays. Some of the resistors in the TM3030 have to be 1% and those in the DAC circuitry need to be 0.1% types. Failure to use good quality parts in these locations will affect the VCO tuning stability.
- Page 9 J201 devices may well be less than that of the 2SK30A-0 types. I will leave the choice of device to you. However, I have tested both parts in the TM3030 and recorded and compared the resultant audio output. I cannot tell the difference in the outputs from the two types.
- Page 10 FET and resistor and neither of these should be fitted if you are using a BA662. For the dual op-amps in the TM3030 I have specified the same parts as used in the original unit. These are AN6562 devices. They have a very large input voltage range, that includes zero volts, so they cannot be substituted with more common op-amps like the TL072.
- Page 11 The power on switch will probably be fitted to the rear of the unit if you are using a half rack case or fitting two TM3030 units in one 1U rack. You can chose any type of switch you fancy,...
- Page 12 The topic of power supplies and cases have already been covered in their own sections earlier in this document. Builders should know that there is now a ‘Oakley Preferred Parts List’ online. This gives the part codes of our most used parts. It can greatly speed up ordering times. This can be found at www.oakleysound.com/parts.pdf.
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Page 13: Parts List
Parts List I strongly advise you to read the 'Buying Your Components' section above before you place any order for parts. For general information regarding where to get parts and suggested part numbers please see our useful Parts Guide at the project webpage or http://www.oakleysound.com/parts.pdf. A quick note on European part descriptions. - Page 14 Capacitors 10nF 1% polystyrene 33pF ceramic plate C1, C2 330p ceramic plate 3n3, 100V polyester 1nF, 100V polyester 10nF, 100V polyester 15nF, 100V polyester 33nF 100V polyester C41, C23, C28, C24 47nF 100V polyester 100nF, 63V Polyester film C31, C6, C49, C47, C33, C34 220nF, 63V polyester 100nF, 63V axial ceramic C5, C7, C10...
- Page 15 All Alpha 16mm types with matching brackets. Note Alpha and ALPS use A and B suffixes on their pot values. A = log and B = linear. This is completely opposite to the labelling on the TM3030 schematic which follows the standard European designations. 1M log...
- Page 16 Populating the PCB Warning: Oakley PCBs are supplied with the RoHS compliant lead free HASL finish. This is a good quality finish but does possess slightly different soldering characteristics to the traditional lead based HASL finish. Avoid touching the solder pads which can cause premature tarnishing of the finish.
- Page 17 much solder on, and don’t put too little on either. Clip the leads off with a pair of side cutters, trim level with the top of the little cone of solder. Once all the resistors have been soldered, quickly check them ALL again. Make sure they are all soldered and make sure the right values are in the right place.
- Page 18 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 photograph on the TM3030 web page to see how I have done it.
- Page 19 Mounting the Pots, LEDs and Switches If you are using the recommended Alpha pots, then they can support the PCB with specially manufactured pot brackets. You will not normally need any further support for the board. When constructing the board, fit the pot brackets to the pots by the nuts and washers supplied with the pots.
- Page 20 Your choice of case will also be affected by what else you want in your enclosure. It is possible, in theory at least, to fit two TM3030 units side by side in a 1U rack case. This does depend on the rack case you have chosen, but most should have the front panel space to allow this.
- Page 21 For those of you fitting an internal toroidal transformer. Please, please make sure there is no way the top metal disc of the transformer's mounting can touch the top of the casing. If the metal support of transformer together with the case makes a complete loop around the core, then you have a shorted one turn secondary.
- Page 22 In the production run we have used 0.1" headers for all the I/O connections. This should give you more flexibility in making your unit suit your own needs. The TM3030 board will be held in place in the case either by the pot brackets or the four mounting posts.
- Page 23 That completes the wiring of the TM3030. All those Trimmers Before you use your TM3030 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.
- Page 24 Then re-check the scaling and adjust if necessary. The TM3030 is set to respond to the same notes as the original device. Therefore it is not possible to play all 127 notes on a midi keyboard. The top and bottom notes are ignored as the TM3030 only responds to the middle 64 notes.
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Page 25: Final Comments
Final Comments If you have any problems with the module, an excellent source of support is the Oakley Sound Forum at Modwiggler.com. I am on this group, as well as many other users and builders of Oakley modules. If you have a comment about this user guide, or have a found a mistake in it, then please do let me know.
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