Oakley Sound Systems
TM3030
PCB Issue 3
Builder's Guide
V3.3
Tony AllgoodOakley Sound SystemsCARLISLEUnited Kingdom
Page 1: ...Oakley Sound Systems TM3030 PCB Issue 3 Builder s Guide V3 3 Tony Allgood Oakley Sound Systems CARLISLE United Kingdom...
Page 2: ...und com tm3030 htm 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 For ge...
Page 3: ...out for the pitch spacing as the board is laid out to accept 0 3 7 5mm for these devices The horizontal preset or trimmer resistors are just ordinary carbon types No need to buy the expensive cermet...
Page 4: ...the two types Q18 is also a 2SK30A Y device You should seek out this part if you want the envelopes to behave in the same way as the original Y types are easier to get hold of than O types and various...
Page 5: ...hance that they will be matched well enough for this application Modern fabrication methods are much better than they used to be The VCA circuit also allows the builder some choice in the construction...
Page 6: ...he panel More detail about mounting the LEDs is given on this later on this document Many manufacturers do ready made preformed LEDs in little plastic boxes These may be perfect for the job but be car...
Page 7: ...not let either of the input power leads connect to the chassis Sometimes people like to substitute parts in place of my own recommendations Feel free to do this but remember that there is normally a...
Page 8: ...88 R89 R113 R14 R61 R42 220R R1 R9 R10 1K R4 R117 R104 R84 R31 R64 1K5 R106 1K8 1 metal film R85 2K2 R12 R29 R109 R112 R107 R110 R63 R44 R43 R94 R59 R58 R80 2K2 1 metal film R91 3K3 1 metal film R40 3...
Page 9: ...elect C54 C48 C27 C38 C36 C50 C17 C18 C25 22uF 35V elect C4 C3 47uF 35V elect C45 C26 C39 C40 470uF 35V elect C16 Discrete Semiconductors 1N4004 power diode D7 D6 D4 D3 1N4148 signal diode D2 D14 D1 D...
Page 10: ...ith seven matching brackets Note Alpha and ALPS use A and B suffixes on their pot values A log and B linear 1M log DECAY 50K lin TUNE ENV_MOD FREQUENCY ACCENT 50K lin x 2 dual gang RESONANCE 50K log V...
Page 11: ...it board A small gap of around 1mm is recommended 2 The positive temperature coefficient PTC resistor is mounted so that is lies across the top of U6 This is to ensure that both it and U6 are at the s...
Page 12: ...onnecting 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 cond...
Page 13: ...and B linear So a 1MA is a 1 megohm log pot The four front panel mounted LEDs must be fitted carefully if you are using the directly mounted technique Although this sounds fiddly it s actually quite...
Page 14: ...table switch should fit tightly into its respective holes on the board You may need to use a pair of fine nosed pliers to help the flexible gold pins into the board holes Make sure the switch body is...
Page 15: ...press for details of this service but don t expect it to be cheap A Schaeffer FPD file can be found on the TM3030 s project webpage which can be downloaded and edited If printed out at 100 size and in...
Page 16: ...of the case underneath the PCB and connected to the GND pad of the TM3030 Do not connect your screening to any lug of the power pack inlet socket though When using any metal case it is essential that...
Page 17: ...oard back to the bonding point There is little more information about using internal mains transformers later in this document I should stress that building a component level mains transformer into an...
Page 18: ...y Remember to keep all wires as short as you can but allow for a little extra so that no wire will ever become taut I usually tin the bare wire ends with a bit of solder before I place the wire into t...
Page 19: ...is the earth or ground of the signal Now if you have used a socket with a metal bush and securing nut and have a metal case then the jack socket will have grounded your case By grounding your metal c...
Page 20: ...in 4 on socket Pin 2 on PCB goes to Pin 2 on socket Pin 3 on PCB goes to Pin 5 on socket If you have used a plastic audio output socket then you should also connect pin 2 on the midi output socket to...
Page 21: ...nd 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 mains carrying co...
Page 22: ...Bs or whole modules You will be charged for all postage costs 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 wee...
