SE330 Issue 2 Builder`s Guide
Contents
1. Pin 2 of the OUT_L header is left unused 11 Final Comments If you have any problems with the module an excellent source of support is the Oakley Sound Forum at Muffwiggler com Paul Darlow and I are on this group as well as many other users and builders of Oakley modules I d love to hear about what you have done with your module Please do post pictures of your finished module at the Oakley Sound forum on Muffwiggler And 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 I can service either fully populated PCBs 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 week The minimum charge is 25GBP plus return postage costs If you have a comment about this user guide or have a found a mistake in it then please do let me know But please do not contact me or Paul Darlow directly with questions about sourcing components or general fault finding Honestly we would love to help but we do not have the time to help everyone individually by e mail Last but not least can I say a big thank you to all of you who helped and inspired me Thanks especially to all those nice people on Muff s Forum and the Synth diy and Analogue2. against the board Now refit the front panel and make sure the round switch barrel fits into its hole in the front panel Now solder all the pins on each of the switches including the two securing pins to the front That completes the soldering of the front panel components Power Supply Power is admitted onto the board using the usual Oakley power system That is a single four way 0 156 3 96mm MTA or Molex KK header For the rack projects I am recommending the Molex system over the MTA simply because the tool needed to make the interconnects is much cheaper It is also possible to solder the crimp terminals used in the KK system It is of course quite possible to solder your power leads straight onto the board The board is protected against reverse polarity with a couple of Schottky diodes Note that these diodes work by shorting out your power supply in the event of a reversal Because of this they should not be relied on if the reversal continues for a long time as this will stress both the diodes and the power supply The diodes are simply there to save the board s ICs from certain death in the event of the power being inadvertently reversed or partially removed during testing There is no overvoltage protection so be careful not to put anything over 17V into the board The pin out for the power connector PSU Pinl 12V to 17V Pin2 Ground 0V Pin3 Ground 0V Pin4 12V to 17V Pin 1 is indicated by the little diagonal
3. guaranteed to make a permanent electrical connection to the casing when they are tightened up It also means that your PSU must be grounding the case directly which unlike with the internal mains transformer is not what I recommend when using an external wall wart Therefore I prefer to use plastic framed chassis mounted sockets for my rack projects This allows the case to be grounded via the power supply and keep the sleeve terminals of all the sockets locally isolated from the case Grounding the sockets must therefore be done via a short wire link back to either the PSU s main ground star point which is not so easily done on the RPSU if both four way headers are being used or the main SE330 PCB Input Socket The two way header named INPUT should be wired so that pin 1 goes to the tip of the input socket and pin 2 goes to the ring Twist the wires together so that they form a simple cable The sleeve or ground of the input socket does not connect directly to the PCB but should be connected to the sleeve terminal the left output socket Output Sockets The three way headers named OUT_L and OUT_R should each be wired so that pin 1 connects to the tip of the relevant output socket and pin 3 goes to the ring Again twist the wires into pairs to form simple cables The sleeve or ground terminal of left output socket should go to the sleeve terminal of right output socket This then connects back to the board to pin 2 of the OUT_R header
4. 0 R58 R168 R60 390R R98 R87 R88 R100 R85 R99 R101 R86 470R R177 510R R158 R164 R166 IK R179 3K3 R45 R48 R47 R188 R46 4K7 R67 R69 6K8 R79 R63 R7 R93 R1 R3 R61 R80 R176 R94 R5 8K2 R183 10K R42 R148 R9 R11 R43 R147 R89 R150 R41 R149 R146 R145 R10 R174 R44 R84 R12 11K R175 R6 R8 R2 R4 15K R72 R91 R75 R76 R160 R107 R96 R73 R152 R77 R68 R105 R153 R70 R83 R90 R159 R82 R184 R156 R187 20K R181 22K R143 R97 R144 R102 R180 R141 R142 33K R55 R157 R54 R104 R186 R173 R134 R155 R53 R136 R185 R135 R106 R56 R25 R26 R27 R28 47K R78 R115 R103 R110 R81 R95 R171 R116 R92 R24 R118 R23 R22 R108 R113 R109 R111 R21 56K R130 R172 R128 R123 R122 100K R163 R31 R161 R36 R165 R32 R19 R35 R139 R13 R33 R127 R34 R162 R169 R137 R167 R37 R30 R15 R124 R38 R29 R17 R133 R129 R131 R39 R151 R121 R40 120K R114 R112 R119 R117 150K R52 R50 R51 R49 180K R16 R18 R20 R14 220K R132 R125 R126 R120 270K R182 470K R65 R62 R71 R154 R66 R64 R74 4M7 5 R178 Capacitors 100nF ceramic multilayer axial 47pF COG ceramic 2 5mm 100pF COG ceramic 2 5mm 220pF COG ceramic 2 5mm 330pF COG ceramic 2 5mm 560pF COG ceramic 2 5mm 2u2 63V electrolytic 10uF 35V electrolytic 10uF non polar electrolytic 47uF 25V electrolytic InF 100V polyester 1n5 100V polyester 2n2 100V polyester 22nF 63V polyester 10
5. 0nF 63V polyester 330nF 63V polyester 470nF 63V polyester luF 63V polyester Notes C95 C24 C75 C113 C62 C41 C44 C79 C83 C76 C12 C89 C21 C11 C22 C10 C23 C98 C102 C126 C104 C116 C9 C86 C115 C61 C74 C78 C42 C43 C84 C88 C114 C77 C82 C60 C87 C80 C73 C103 C125 C81 C59 C124 C17 C18 C19 C20 C67 C100 C71 C48 C45 C90 C68 C94 C99 C91 C72 C47 C46 C15 C117 C14 C121 C13 C16 C92 C109 C112 C101 see note 2 below C40 C52 C38 C39 C49 C50 C51 C37 C57 C58 Optional see note 1 below C53 C54 C55 C56 C110 C118 C119 C7 C5 C1 C3 C106 C8 C4 C6 C2 C105 C34 C33 C107 C36 C35 C63 C65 C108 C69 C28 C27 C64 C25 C70 C66 C26 C29 C93 C111 C122 C30 C123 C31 C32 1 Non polar capacitors C85 C96 C97 and C120 are optional and can be replaced with wire links They are used as DC blocking sometimes called audio coupling capacitors and are there to filter out any unwanted steady state offset voltages from the final output amplifiers However I found that the OPA2134 produces such a small offset as to warrant the use of such capacitors superfluous 2 For C101 C109 and C112 560pF is the recommended value from the V2164 datasheet but all three can be replaced with 470pF with no obvious issues Discrete Semiconductors 1N5819 Schottky diode 1N4148 small signal diode 3 6V 500mW zener diode BCS550 NPN transistor BC560 PNP transistor Gr
6. Heaven mailing lists Tony Allgood at Oakley Sound Cumbria UK October 2013 updated December 2014 No part of this document may be copied by whatever means without my permission 12
7. Oakley Sound Systems Stereo Ensemble SE330 PCB Issue 2 Builder s Guide v2 0 5 Tony Allgood Oakley Sound Systems CARLISLE United Kingdom Introduction This is the Builder s Guide for the issue 2 Stereo Ensemble Module SE330 from Oakley Sound This document contains a basic introduction to the circuit board and a full parts list for the components needed to populate the board or boards For the User Manual which contains an overview of the unit and goes into some detail regarding the operation of the module please visit the main project webpage at http www oakleysound com se330 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 general information on how to build our modules including circuit board population mounting front panel components and making up board interconnects please see our generic Construction Guide at the project webpage or http www oakleysound com construct pdf This is an early version of the documentation If you do find any errors even silly little ones please do let me know either directly by e mail or via the forum Esiuc tirea A 28 Bla TO AANS pata BILA PANNE gt g AmS 2al Blu rrimS rI Aem 6Bta OORT e219 SINO 2zi A i i A completed issue 1 SE330 circuit board awaiting its case Issue 2 looks virtually identical The Oakley S
8. can use 47K in place of a 50K pot The two board mounted LEDs must be fitted carefully if you are using the directly mounted technique Although this sounds fiddly it s actually quite easy and it reduces wiring interference and possible errors Remove the front panel so that you just have the board again Get one of the LEDs and find the cathode Make sure the cathode of the LED will go into the square pad pin 1 on the board Carefully bend the LED s legs at a point 6mm away from the plastic body of the LED The legs should be bent by 90 degrees so that the legs are pointing straight down Check to see if they fit into the board The bottom of the LED s body should fit just flush to the board edge Fit the LED to the board but do not solder it in at this stage Let its legs poke through there s no need to cut them down yet Now fit the front panel again to the board and tighten the pot nuts You should find that the board now fits snugly into position and the LED should be just poking out of its hole neatly albeit loosely Align the LED if it isn t quite straight and then solder it trimming its leads nice and short afterwards Now repeat the operation for the second LED With panel removed once again you can now fit the switch The PCB mountable switch should fit tightly into its respective holes on the board Indeed it will probably work for short time without soldering it in so don t forget to do so Make sure the switch body is flat
9. een or yellow 3mm LED Red 3mm LED Integrated Circuits 78L09 9V 100mA regulator LM13700 dual OTA V3102D Coolaudio BBD driver V3207 Coolaudio BBD DG403 analogue switch OPA2134PA dual op amp TLO72 dual op amp NE5532 dual audio op amp V2164D quad VCA D13 D14 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D15 D16 D17 D20 D18 D19 Q9 Q4 Q11 Q13 Q8 Q14 Q12 Q3 Q5 Q6 Q10 Q2 Q1 Q7 ON PEAK 33 U1 U24 21 U30 U2 8 U27 U36 35 U26 U6 OW cc qCqe O v 40 U8 U39 11 U22 U15 U32 U38 U16 U29 U5 U34 J31 U4 U25 U3 U14 NFR WRAY NW ONnN 4 ccc O COaCGaQGGOGGG N oo The Belling BL3207 or Panasonic MN3207 may be used instead of the Coolaudio V3207 IC sockets are recommended You need 29 8 pin DIL sockets and 7 16 pin DIL sockets Trimmers 20K or 22K 6mm 47K or 50K 6mm 100K 6mm 4K7 or 5K 6mm Pots All pots 16mm Alpha or Alps types 47K or 50K linear dual gang 47K or 50K linear S LVL T_LVL OFF 1 OFF2 OFF3 OFF4 CLK1 CLK2 CLK3 CLK4 T_FRQ S FRQ NULL1 NULL2 NULL3 NULL4 BALANCE OUT_LEVEL TRL RATE TRI DEPTH SIN RATE SIN _DEPTH IN LEVEL Seven Alpha pot brackets Seven knobs to suit Switch SPDT on off on toggle switch Interconnects 4 way 3 96mm Molex KK or MTA header 2 way 0 1 Molex KK or MTA header 3 way 0 1 Molex KK or MTA header The 2 way header DIRECT is unused 1 4 TRS jack sockets plastic fra
10. me MODE PSU INPUT OUT L OUT R 3 off Mounting the Pots LEDs and Switches A close up showing the two stereo dual gang pots the power on LED and the three way toggle switch Note also the optional output capacitors that have simply been linked out If you are using the recommended Alpha pots then they can help support the PCB with the addition of the specially manufactured pot brackets However given the large size of the SE330 PCB it is also necessary to utilise some or all of the mounting holes at the edge of the board These holes are sized to take an M3 screw and can be used with suitable hex spacers to fit the PCB directly to the lower panel of your case When constructing the board temporarily fit the pot brackets to the pots by the nuts and washers supplied with the pots Now fit them into the appropriate holes in the PCB But only solder the three or six pins that connect to the pot Do not solder the pot bracket at this stage When you have soldered all the pots you can fit the board to your front panel Position the PCB at right angles to the panel the pot s own pins will hold it fairly rigid for now Then you can solder each of the brackets This will give you a very strong support and not stress the pot connections The Alpha pots are labelled with an A B or C suffix For example 50KB or 1OKC Alpha and ALPS use the key A log B linear and C reverse log So a 50KB is a 50 kilohm linear pot Remember you
11. on the header s legend Both ground connections need not be connected to your power supply However you do most certainly need at least one of them either pin 2 or pin 3 will do if you using only one connection A special compact low voltage supply has been made for this and other Oakley rack projects in the form of the Oakley RPSU You don t have to use this as any decent split rail supply will do but it is an easy build and is flexible enough to suit most builders needs Please see the RPSU Builder s Guide and User Manual for more details 10 Inputs and Outputs If you are building the suggested design then you have only one input and two outputs Both input and outputs are balanced and you should use TRS jack sockets TRS tip ring sleeve sockets are ones with three poles and are also used for headphone outputs Even though both input and outputs are balanced they are still compatible with unbalanced signals This means you can plug ordinary two pole mono jacks into the TRS sockets and the unit will work as expected Audio projects should really be built into metal cases to prevent interference and because of this we now face a bit of a conundrum Ideally balanced input and output sockets should be grounded to the case If you have internal mains transformer then the case will be grounded via the power supply so this will ground the socket and any connecting cables But this only works if your sockets have a metal frame and can be
12. ound SE330 The SE330 does not have any built in power supply It is expected that the circuit board be powered from a regulated split supply of 12V to 17V Power is admitted onto the board via a four way 0 156 2 96mm header of MTA or KK type The module is designed to be powered by our own Rack Power Supply Unit RPSU or any other split rail compatible supply such as the Oakley PSU The benefits of using the RPSU are its small size and ability to take a variety of different AC power sources Because of the inherent dangers of using a component level mains transformer in your project I recommend that you use an external low voltage AC source such as that obtained from a wallwart or line lump The RPSU can then be fed from a low voltage alternating current supply so all the high voltages are kept inside the wallwart or line lump The User Manual for the RPSU will go into more detail of the various options for powering your unit A single RPSU should be capable of driving both the HVM and SE330 should both projects be built into the same case The board size is 198mm width x 234mm depth Power consumption of the SE330 with no audio passing through it is 140mA and 110mA at 15V Issue 2 differs from issue 1 only in a few aspects 1 All the recommended modifications for soft limiting the input signal in issue 1 are now incorporated in the board layout 2 The first stage of low pass filtering after the BBD circuitry is now inver
13. ting and not non inverting This maintains the phase between the dry and wet signals so that the track cuts required on the issue 1 board are not necessary 3 All single gang pots are now 47K linear or 50K linear 4 The output driver circuits are now inverting and incorporate a small amount of high frequency filtering to ensure stability in long cable runs 5 The parts numbering of the resistors diodes and capacitors is completely different 6 The four offset trimmers for the BBDs operate over a smaller range making it easier to find the sweet spot Parts List 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 The components are grouped into values the order of the component names is of no particular consequence Component values given in this list supersede those shown on the schematic A quick note on European part descriptions R is shorthand for ohm K is shorthand for kilo ohm So 22R is 22 ohm 1K5 is 1 500 ohms or 1 5 kilohms For capacitors 1uF one microfarad 1000nF one thousand nanofarad 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 Resistors All resistors 1 0 25W metal film resistors except where stated 220R R140 R59 R138 R57 R17
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