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Summary of Contents for Oakley TM3030
- Page 1 Oakley Sound Systems TM3030 PCB Issue 3 Builder's Guide V3.3 Tony Allgood Oakley Sound Systems CARLISLE United Kingdom...
- Page 2 Introduction This is the Builder’s Guide for the issue 3 TM3030 sound module from Oakley Sound. This document contains a basic introduction to the board, a full parts list for the components needed to populate the board or boards, and a list of the various interconnections,...
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Page 3: Parts Information
Quite often you see an A, B or C suffix used, eg. BC549C. This letter depicts the gain or grade of the transistor (actually hfe of the device). The TM3030 is designed to work with any grade NPN devices although I have used BC550B in my issue 2 prototype. - Page 4 J201 devices may well be less than that of any two 2SK30A-0. 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 5 The differential amplifier of the filter uses a single 2SC1583F in the original design. The TM3030 allows for this if you can get hold of the 2SC1583. If not, then do not worry, as the board can also be fitted with a hand matched pair of BC549B, BC550B, BC549C or BC550C transistors in positions Q36 and Q37.
- Page 6 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 7 The power inlet socket should be one to match your choice of wallwart supply. However, it is important that you chose an insulated design, ie. one made from a plastic housing. It is imperative that you do not let either of the input power leads connect to the chassis. Sometimes people like to substitute parts in place of my own recommendations.
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Page 8: Parts List
Parts List I strongly advise you to read the 'Parts Information' 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 9 1K +3500ppm/K PTC - see text for mounting information. 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 C31, C6, C49, C47, C33, C34...
- Page 10 Integrated Circuits 4050 hex non-inverting buffer U5, U4 4066 quad analogue switch 6562 or LM358 dual op-amp U7, U13 6N137 opto coupler LM723 voltage regulator 78L05 +5V regulator BA662 Roland OTA U15 - fit only if not fitting CA3080 in U14 CA3080 OTA U14 - fit only if not fitting BA662 in U15 PIC18F242 TM midi-chip...
- Page 11 VCO control circuitry. A close up of the VCO circuitry of the TM3030. Note the positioning of the positive temperature coefficient (PTC) resistor. Although not used here, a small amount of thermal paste can be used to keep both U6 and the PTC at the same temperature.
- Page 12 bonded together. One way of thermally connecting them is to tie them together with a cable tie as seen in the photograph below. Two BC550B transistors face to face and fixed together with a simple cable tie. Again, a small amount of heat conducting paste can be used if desired.
- Page 13 Although this sounds fiddly, it's actually quite easy and it reduces wiring, interference and possible errors. A close up of the LEDs in a 19” rack mounted issue 1 TM3030. You can see that the LEDs simply poke through the front panel.
- Page 14 and each LED should be just poking out of its hole neatly, albeit loosely. Align the LEDs if they aren’t quite straight and solder each one in turn, trimming its leads nice and short afterwards. With panel removed once again, you can now fit the switches. The C&K PCB mountable switch should fit tightly into its respective holes on the board.
- Page 15 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 16 My first issue 2 TM3030 fitted into the now obsolete case from RS Components (pt no: 222-020). I should point out that the best performance will always come from using metal cases. Metal cases are not only more rugged but they also provide screening. A good grounded case will protect the TM3030 from extraneous radiation from CRTs, amplifiers and computers.
- Page 17 This is best done with a M4 bolt, nut, toothed washer and solder tag directly wired (with thick wire) to the IEC inlet socket's earth tag. The TM3030's circuitry should be then tied to earth via another wire from the GND pad on the board back to the bonding point.
- Page 18 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, or even a mixture of the two. The sockets should then be mounted onto the rear panel and then hand wired to the PCB.
- Page 19 If you have a plastic output socket do not worry you'll be grounding your case with the midi sockets. A close up of an older issue 1 TM3030 showing the midi connections done with Molex KK 0.1” headers and housings. Issue 3 boards can be wired in a similar way.
- Page 20 Fit an M3 screw through this hole and with a nut, toothed washer and solder tag create a grounding point on the inside of your case. Then connect a wire from this grounding point to the GND pad on the TM3030 PCB. That completes the wiring of the TM3030.
- Page 21 The 0V on the TM3030 circuit board should also be tied to earth. This should be done using a piece of insulated wire connecting the earth bonding point to the GND pad on the board.
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Page 22: Final Comments
Oakley modules. If you can't get your project to work, then Oakley Sound Systems are able to offer a 'get you working' service. If you wish to take up this service please e-mail me, Tony Allgood, at my contact e-mail address found on the website.