Oakley 5U User manual

Oakley Sound Systems
5U Oakley Modular Series
Analogue Synthesiser Voice
PCB set issue 1
Builder's Guide
V1 14
Tony Allgood
Oakley Sound Systems
CARLISLE
United Kingdom

The suggested panel design for the 5U wide MOTM format module.
2

The suggested panel design for the 4MU wide MU format module.
3

Introduction
This is the roject Builder's Guide for the issue 1 Analogue Synthesiser Voice (ASV) module from
Oakley Sound. This document contains a basic introduction to the board set, a full parts list for the
components needed to populate the boards and how to connect the boards together.
For the User Manual, which contains an overview of the operation of the unit and the calibration
procedure, please visit the main project webpage at:
http://www.oakleysound.com/asv.htm
For general information regarding where to get parts and suggested part numbers please see our
useful arts 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.
The prototype ASV built onto a MOTM format panel with issue 1.1 main board issue 1 VCO board issue 1 socket
board and issue 1 pot/switch board. Other issue 1 PCBs will be similar.
4

The original issue 1 Pot/Switch board. Other issues are built in a similar way.
The ASV was the first Oakley module to use vertically mounted pots and switches. This type of construction allows
for much shallower modules.
5

arts Lists
For general information regarding where to get parts and suggested manufacturer part numbers
please see my useful arts 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.
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.
ASV Main Board issue 1.1 arts List
Resistors
1% 0.25W metal film types are recommended for most values. R63, R64, R67 and R68 should be
high precision 0.1% or better.
R35 is a positive temperature coefficient resistor with a nominal value of 1K and temp. co. of
anywhere between +3000ppm/K and 3900ppm/K. Alternatively, it can be a standard 1K resistor if
you don't mind a small amount of temperature dependant drift in the centre frequency of the VCF.
lease note that some resistors are different depending on whether you a have an issue 1.1 or issue
1.2 ot Board, and if you are building your ASV in a MU or MOTM based format.
22R R79, R80
47R R109
220R R78, R74, R72, R160, R75
390R R25, R27, R31, R32, R85, R86
1K R149, R131, R139, R128, R141, R152, R130, R143, R142, R140, R159,
R153, R51, R129, R135, R137, R155, R136, R132, R146, R138, R144, R65
1K +3300ppm/K R35
2K2 R5, R16
4K7 R103, R125
6K8 R83, R88
10K R13, R126, R3, R10, R114, R113, R98, R28, R158
11K R161
12K R97, R15, R30, R33, R119, R50, R49
15K R59, R89, R127, R43, R44, R90, R107, R104, R29, R12
20K R105
22K R6, R9, R87, R8, R37, R36, R7
27K R24
30K R154, R157
33K R2, R20, R21, R52, R117
6

36K R96, R106, R118, R133, R148
39K R163, R147, R156, R134, R162, R164, R150, R145
47K R1, R34, R23, R53, R54, R55, R84
68K R45, R42
75K R94, R58
100K R17, R18, R70, R66, R61, R62, R102, R111, R4, R19, R73, R69, R56, R108,
R121, R76, R60, R165, R81, R57, R95, R11
100K/0.1% R63, R64, R67, R68
120K R112, R115, R116
150K R38, R82
220K R22, R151
240K R110
300K R123
470K R124
680K R26
910K R48, R39
1M R41, R46, R77, R120, R14, R71, R122
For MOTM/Oakley format
This is to be used if you have already have older Oakley VCOs and want your ASV VCOs to
behave identically to the Key CV input. Anyone with a midiDAC issue 4 and older should also
build this version.
150K R40, R47
For MU/Synthesisers com format
This is to be used if you have a predominantly MU system and/or have an issue 5 Oakley midiDAC.
220K R40, R47
For use with an issue 1 1 Pot Board
100K R91, R92, R100, R101
180K R93, R99
For use with an issue 1 2 Pot Board
22K R93, R99
47K R91, R101
Do not fit R92 and R100. Leave these two spaces empty.
7

Capacitors
100nF axial multi-layer ceramic C43, C23, C42, C19, C9, C66, C24, C27, C18, C28, C22, C40,
C53, C33, C1, C34, C59, C12, C52, C11, C69, C17, C38, C44,
C25, C14, C67, C2, C56, C46, C21, C30, C4, C50, C41, C39,
C49, C26, C54, C45, C48, C68
10pF C0G ceramic 2.5mm C13
33pF C0G ceramic 2.5mm C6, C29, C31
220pF C0G ceramic 2.5mm C36, C37, Cx*
470pF C0G ceramic 2.5mm C5, C8, C47, C55, C57
10nF polyester film C62
22nF polyester film C64, C65
39nF polyester film C61, C63
330nF polyester film C7
220nF polyester film C51
680nF polyester film C15
1uF, 63V electrolytic C60
2u2, 63V electrolytic C3, C10, C16, C20
10uF, 35V electrolytic C58
47uF, 25V electrolytic C32, C35
* Cx is only fitted to the underside of the board between pins 1 and 2 of U16 if you are using the
main board with an issue 1.1 ot Board. It is not needed with issue 1.2 ot Boards. See later for
details.
Trimmers
10K multiturn trimmer SCL1, SCL2
100K multiturn trimmer TUN1, TUN2
200K multiturn trimmer OCT1, OCT2
10K 6mm trimmer F_SCL
50K 6mm trimmer A_LVL
100K 6mm trimmer F_OFF1, F_OFF2, A_OFF, F_FREQ, LFO_RNG
Discrete Semiconductors
1N4148 silicon signal diode D1, D2, D3, D4, D5, D6, D7, D8, D11, D12, D13, D14, D16,
D17
BAT42 Schottky signal diode D15, D18
1N5819 Schottky power diode D9, D10
BC550 N N transistor Q3, Q7, Q8
BC560 N transistor Q1, Q2, Q4, Q9, Q10
J201 FET Q5, Q6
8

Integrated Circuits
CD4013 dual D-type flip-flop U26
CD4093 quad NAND gate U21
4558 dual op-amp U10
AS3310 envelope generator U24, U25
LM13700 dual OTA U8, U14, U15
LM4040-10 10V reference U2
LT1013 dual op-amp U3, U11, U19
O A2134 dual audio op-amp U12
TL072CN dual op-amp U22, U6, U16, U17, U13, U20
TL072AC dual op-amp U4, U18
78L12 100mA +12V regulator U1, U7
79L05 100mA -5V regulator U23
79L12 100mA -12V regulator U5, U9
Miscellaneous
Ferrite bead L1, L2, L3, L4
MTA100 3 way BUS
MTA100 2 way OUT
MTA100 6 way WR1, WR2
MTA156 4 way SU1, SU2
2 x 8 way 0.1” boxed header * HDR1, HDR2, HDR3
10-way SIL 0.1” socket ** CN1, CN2, CN3, CN4, CN5, CN6, CN7, CN8
10-way SIL 0.1” header OSC1, OSC2, OSC3
* If you have bought polarised headers for HDR1, HDR2 and HDR3, then they must be aligned
correctly. in 1 lines up with the square pad on the CB. in 1 is normally depicted by a small
triangle on the body of the header.
** CN1 to CN8 mounted on the underside of the board, facing down, and soldered from the top.
IC sockets are optional but recommended for DIY projects. There are thirteen 8-pin, two 14-pin and
five 16-pin DIL sockets used on the main board.
9

The two sets of transistor pairs Q3 and Q4 and Q9 and Q10 can be tied together with a cable tie to help keep
both devices at a similar temperature. This reduces the amount of drift in the filter's and LFO's operating
frequencies.
These boxed IDC headers are polarised as they have a notch taken out of the side to ensure an inserted socket is
fitted the correct way around. They are fitted to the topside on the main board and on the underside of the socket
board.
10

ASV Dual VCO Board issue 1 arts List
Resistors
1% 0.25W metal film types are recommended for all values.
75R R12, R1
820R R29, R30
2K R31, R32
10K R46, R47, R35, R50, R48, R45, R21, R22, R42, R5, R33, R49, R36,
R37, R43, R9
12K R3, R13
15K R28, R16
20K R11, R15, R17, R2, R20, R24
24K R27, R25
30K R26, R18, R19, R23
39K R14, R7
47K R44, R34
680K R10, R4
1M R40, R41, R39, R6, R8, R38
1K KRL +3500ppm/K TC1, TC2 – fit side by side on top surface of U6
Capacitors
100nF axial multi-layer ceramic C6, C15, C18, C23, C5, C13, C14, C28, C19, C16, C17, C20,
C27, C24
47pF C0G ceramic 2.5mm C7, C10, C25, C26
100pF C0G ceramic 2.5mm C9, C8
1000pF C0G ceramic 2.5mm C22, C21
22nF polyester film C11, C12
2u2, 63V electrolytic C1, C2, C3, C4
Trimmer
10K multiturn trimmer HFT1, HFT2
Discrete Semiconductors
1N4148 silicon signal diode D1, D2, D3, D4, D5
BC550 N N transistor Q1, Q5, Q6
J112 FET Q2, Q3, Q4
11

Integrated Circuits
LM393 dual comparator U7, U8
LT1013 dual op-amp U1, U2
THAT300 N N array U6
TL072AC dual FET op-amp U3, U4, U5
Miscellaneous
10-way SIL socket * OSC1, OSC2, OSC3
* OSC1 to OSC3 are mounted on the underside of the board and soldered from the top.
IC sockets are optional but recommended for DIY projects. There are seven 8-pin and one 14-pin
DIL socket used on the VCO board.
The three ten way SIL sockets on the VCO Board like the eight sockets on the main board are mounted on the
underside of the board.
12

ASV ot & Switch Board issue 1.1 arts List
Note that this is for issue 1 1 Pot Boards only Check which issue board you have before
starting to populate your board
Resistors
1% 0.25W metal film types are recommended for most values. R1, R2, R3 and R4 should be high
precision 0.1% or better.
220R R27
2K2 R5, R29
22K R21, R22, R23, R24, R14, R26, R28
22K/0.1% R1, R2, R3, R4
47K R9, R10, R15, R17
62K R12, R13, R20
100K R8, R16, R18
180K R6
470K R7, R11, R19, R25
Capacitors
100nF axial multi-layer ceramic C1, C7, C8, C5, C15, C3, C12, C16, C11
33pF C0G ceramic 2.5mm C6, C9
100pF C0G ceramic 2.5mm C2, C14
2u2, 50V polyester * C10, C17, C18, C19
2u2, 63V electrolytic ** C4, C13
* WIMA MKS2B042201F00KSSD are recommended due to their smaller height.
** These should be miniature or low profile types to allow them to fit under the panel. However,
ordinary full height parts can be used if they are laid down flat.
Discrete Semiconductors
1N4148 silicon signal diode D1, D2, D3, D4
BC550 N N transistor Q1
BC560 N transistor Q2
LED 5mm green GATE – solder only when panel is in position
13

Integrated Circuits
LM4040-10 10V reference U3
LT1013 dual op-amp U2
TL072AC dual op-amp U1, U4, U5
Potentiometers
50K linear ENV1_DE TH, VCF_FREQ, LFO_RATE, ENV1_SUSTAIN,
VCO2_LEVEL, SUB/EXT_LEVEL, ENV1_RELEASE, ENV1_DECAY,
RESONANCE, ENV2_ATTACK, VCO2_ W, VCO1_ W,
ENV2_RELEASE, VCO2_TUNE, VCO2_ WM, VCO1_ WM, VCF_FM1,
TUNE, VCF_TRACK, VCO1_LEVEL, VCF_FM2, ENV2_DECAY,
ENV1_ATTACK, VCO1_VCA, SHA E, ENV2_SUSTAIN
50K audio (log) VCO1/2_FM, VCO2_FM
I recommend additional M7 flat washers for all 28 pots to go between the pot and the inside surface
of either the MOTM format panel or the shim panel for MU builds. I recommend using the same
thickness of flat washer as those that come with the pots.
Switches
S DT on-on switch VCO1_WAVE, SYNC, B /SHA E
SD T on-off-on switch VCO1_OCT, VCO2_OCT
D DT on-on switch VCO2_WAVE
Miscellaneous
10-way SIL header * CN1, CN2, CN3, CN4, CN5, CN6, CN7, CN8
* SIL headers fitted to the underside of the board and soldered from the top. ie. the pins face down.
IC sockets are optional but recommended for DIY projects. There are four 8-pin DIL sockets used
on the ASV pot/switch board.
For the Pot/switch board the 10-way SIL headers are best soldered last and fitted to the underside of the board.
14

ASV ot & Switch Board issue 1.2 arts List
Note that this is for issue 1 2 Pot Boards only Check which issue board you have before
starting to populate your board
Resistors
1% 0.25W metal film types are recommended for most values. R1, R2, R3 and R4 should be high
precision 0.1% or better.
220R R33
2K2 R5, R35
22K R6, R9, R10, R11, R18, R32, R34
22K/0.1% R1, R2, R3, R4
47K R13, R14, R19, R21, R24, R26
62K R16, R17, R25
100K R12, R20, R22, R27, R30
180K R7, R28, R29
470K R8, R15, R23, R31
Capacitors
100nF axial multi-layer ceramic C1, C5, C15, C3, C19, C20, C9, C7, C10, C11, C14
33pF C0G ceramic 2.5mm C8, C12
100pF C0G ceramic 2.5mm C2, C6, C17, C18
2u2, 50V polyester * C13, C21, C22, C23
2u2, 63V electrolytic ** C4, C16
* WIMA MKS2B042201F00KSSD are recommended due to their smaller height.
** These should be miniature or low profile types to allow them to fit under the panel. However,
ordinary full height parts can be used if they are laid down flat.
Discrete Semiconductors
1N4148 silicon signal diode D1, D2, D3, D4
BC550 N N transistor Q2
BC560 N transistor Q1
LED 5mm green GATE – solder only when panel is in position
15

Integrated Circuits
LM4040-10 10V reference U2
LT1013 dual op-amp U1
TL072AC dual op-amp U3, U4, U5, U6
Potentiometers
50K linear ENV1_DE TH, VCF_FREQ, LFO_RATE, ENV1_SUSTAIN,
VCO2_LEVEL, SUB/EXT_LEVEL, ENV1_RELEASE, ENV1_DECAY,
RESONANCE, ENV2_ATTACK, VCO2_ W, VCO1_ W,
ENV2_RELEASE, VCO2_TUNE, VCO2_ WM, VCO1_ WM, VCF_FM1,
TUNE, VCF_TRACK, VCO1_LEVEL, VCF_FM2, ENV2_DECAY,
ENV1_ATTACK, VCO1_VCA, SHA E, ENV2_SUSTAIN
50K audio (log) VCO1/2_FM, VCO2_FM
I recommend additional M7 flat washers for all 28 pots to go between the pot and the inside surface
of either the MOTM format panel or the shim panel for MU builds. I recommend using the same
thickness of flat washer as those that come with the pots.
Switches
S DT on-on switch VCO1_WAVE, SYNC, B /SHA E
SD T on-off-on switch VCO1_OCT, VCO2_OCT
D DT on-on switch VCO2_WAVE
Miscellaneous
10-way SIL header * CN1, CN2, CN3, CN4, CN5, CN6, CN7, CN8
* SIL headers fitted to the underside of the board and soldered from the top. ie. the pins face down.
IC sockets are optional but recommended for DIY projects. There are five 8-pin DIL sockets used
on the issue 1.2 ASV pot/switch board.
16

ASV Socket Board issue 1 & 1.1 arts List
Miscellaneous
2 x 8 way 0.1” boxed header * HDR1, HDR2, HDR3
Switchcraft 112A CX 1/4” socket ** SK1 – SK20.
* HDR1, HDR2 and HDR3 are mounted on the underside of the board. They should be fitted first.
in 1 lines up with the square pad on the CB. in 1 is normally depicted by a small triangle on the
body of the header.
** Do read the section on building socket boards in the Oakley Construction Guide.
Interconnects
2 x 8 way 0.1” IDC socket 6 off
16 way 0.05” IDC ribbon cable 0.3 metres
Additional Hardware
For securing the main board to the pot/switch board, and the main board to the VCO board, you can
use male-female spacers. See assembly section later for more details.
Four off 11mm M3 Male-Female hex spacers.
Eight off M3 toothed washers
Four off M3 6mm screws
Twelve off M3 flat washers
Four M3 nuts
On the VCO board the two large temp co resistors straddle the THAT300 NPN array so that all three devices are
physically touching each other. A non conductive thermal paste or epoxy can be used to bond them together but I
find this is not normally necessary.
17

arts Information
For general information regarding where to get parts and suggested manufacturer part numbers
please see my useful arts Guide available from the the project webpage or directly from:
http://www.oakleysound.com/parts.pdf
The pots used in this project are Alpha 16mm types designed to fit vertically into a CB so that the
base of the pot lies just above the surface of the board. They are sold by several places and are
usually described as 'vertically mounted' or having 'right angled terminals'. The pot shaft is typically
1/4” or 6.25mm in diameter.
I also recommend that you use thin M7 internal flat washers (not toothed washers) between the
panel and pot. The thickness of the washer needed will depend on the thickness of the panel used.
For both the 3mm thick Schaeffer panel, and the 1.5mm MU panel with shim sub-panel, I
recommend using the same thickness of washer as those that come with the pots. These very thin
washers are often available from the same places that sell the pots, eg. Banzai and Musikding.
The front panel was designed for three sizes of control knobs – small, medium and large. The large
ones are the traditional Moogy style with a diameter of 25mm. The medium ones are 19mm and the
small ones are only 13mm. An example of such a trio are shown below and similar knobs can be
obtained from online guitar parts and effects retailers.
The above control knobs give the whole panel a standard 5U modular look and it is in this style that
18

I created the digital artworks for the documentation and website. For my first two prototype models,
however, I decided to do something a little different and go with an all black look. For the large
control knob I chose Thonk's MXR clones. For the medium sized ones I used original Davies
Molding's skirted 'bold small' knobs, also available from Thonk. For the small control knob I used
Thonk's Davies 1900H clones. The small 1900H knobs barely cover the pot nut and washer but the
overall effect is visually pleasing and the knobs are easy to adjust.
The first prototype unit using a printed Schaeffer panel. The nuts for the switches have not yet been fitted.
The switches used in this project are from the Gemini series from TE Connectivity. Other
manufacturers may have equivalents but I have not tried these. The TE part numbers are:
S DT on-on A101SYCQ04 or A101SYCB04
S DT on-off-on A103SYCQ04 or A103SYCB04
D DT on-on A201SYCQ04 or A201SYCB04
You'll notice that each switch type has two different part numbers. The part numbers differ only in
the third from last digit. B is a low voltage part while Q is a higher voltage part. For our application
either may be used, so simply buy the cheapest available.
19

The FET, sometimes called JFET, used in the filter on the main board is the somewhat hard to get
J201. Mouser sell them as their part 106-J201. I should warn you they aren't terribly cheap
compared with other small signal FETs.
The small positive temperature coefficient ( TC) resistor used in the filter is +3300ppm/K,
although +3000ppm/K devices will do the job well enough too.
The two large TC resistors used on the VCO board are wirewound 1K +3500ppm/K types and are
made by KRL. Their part number is C-2AQ.
The AS3310 used on the main board are envelope generators and are made by Alfa in Latvia. The
AS3310 is a clone of the much older and now obsolete CEM3310 chip. You can use either the
CEM3310 or the AS3310 in the ASV. However, if you use the CEM3310 you should make R154
and R157 both 24K. The CEM3310 has a typical maximum attack peak voltage (Vp) of 5.0V. Early
specimens of the AS3310 have a Vp of more than this. I have tested several devices and all were
showing a Vp of 5.4V. Because of this I have made R133 and R148 on the main board to be both
36K. This increases the maximum sustain voltage to 5.2V to reduce the small discrepancy with the
maximum sustain level and the slighter higher than expected maximum attack voltage. Ideally there
should be no discrepancy but 5.2V seems a good compromise between the expected value of 5.0V
and the measured value of Vp in some real devices. Alfa's Alex Zaslavski told me in November
2018 that this has been corrected and Vp will be closer to 5.0V for all new productions of the chip.
The AS3310 you purchase, and indeed any CEM3310 you have, may well have a Vp of 5.0V and
you can use 39K for R133 and R148. However, using 36K as shown in the parts list will allow
perfectly acceptable performance for both versions of the AS3310, and the original CEM3310.
The board interconnects used to connect the main board with the pot board, and the main board with
the VCO board, are in two parts, the male header and the female socket or receptacle. All of these
interconnects are ten way single in line (SIL) connectors. The ones I have used in my builds are
made by Multicomp, although more expensive types are available which may offer increased
longevity. These are the Multicomp part numbers for the parts I used:
10 way socket 2212S-10SG-85
10 way header 2211S-10G
With the above headers I found the resistance to movement sufficiently stiff that the whole three
board assembly stays together without additional mounting support. However, if you are planning
to travel with your ASV then I do suggest using the four suitable M3 hex spacers, nuts and screws
to secure the unit together.
For the Multicomp headers above I needed 11mm spacers plus a flat washer to fit the three boards
together without stressing them. The 11mm M3 male-female hex spacers are made by Harwin, their
part number R30-3001102.
The trimmers used in this project are 6mm and multiturn types. The 6mm ones are Bourns 3386F
types, and the multiturn ones are Bourns 3296W. Other manufacturers make similar products but be
sure to check the pin spacing will fit the CBs.
The 1/4” sockets on the socket board are Switchcraft 112A CX. These are excellent parts and will
last a long time. However, quality does come at a price and they are not cheap.
20