Oakley 5U Manuel utilisateur
Oakley Sound Systems
5U Oakley Modular Series
Fourmix
CV and Audio Mixer
Fourmix PCB Issue 1 & 2
Builder s Guide
V2.0
Tony Allgood
Oakley Sound Systems
CARLISLE
United Kingdom
Introduction
This is the Project uilder's Guide for the issue 1 and issue 2 Fourmix 5U module from Oakley
Sound. This document contains a basic introduction to the board, a full parts list for the
components needed to populate the boards, and a list of the various interconnections.
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/fourmix.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.
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The Fourmix PC
This is the prototype issue 1 Fourmix module behind a natural finish 1U wide Schaeffer panel. Note the
use of the optional Sock6 socket board to facilitate the wiring up of the six sockets.
The issue 1 main PC is 78mm (width) x 124mm (height), and the issue 2 main PC is 75mm
(width) x 124mm (height). The board is a two layer design which means it has copper tracks
on both the upper and lower surfaces.
On the Fourmix printed circuit board there is space for the four main control pots. If you use
the specified 16mm Alpha pots and matching brackets, the PC can be held very firmly to the
panel without any additional mounting procedures. The pot spacing on this board is different
to several of our other 5U modules, instead of 1.625” it is 1.375”. Used in conjunction with
smaller 20mm or 13/16” diameter knobs this still allows for an attractive module design and
finger friendly tweaking.
The main PC has four mounting holes for M3 machine screws, one near each corner. These
are not required for panel mounting if you are using the three 16mm pot brackets.
The main board has been laid out to accept connection to our Sock6 socket board. This small
board speeds up the wiring of the six sockets and reduces the chances of building mistakes.
Power is routed onto the main PC by either a four way 0.156” MTA156 type connector or
the special five way Synthesizers.com MTA100 header.
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Parts Lists
There are two types of Fourmix boards, issue 1 and issue 2, please ensure that you use the
right parts list for the board you have.
For general information regarding where to get parts and suggested part numbers please see
our useful Parts Guide at the project web page 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. R is shorthand for 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.
Issue 1 Fourmix Parts List
Resistors
1% 0.25W metal film types are to be recommended simply because they are better quality and
lower noise components. However, 5% ones can be substituted in any of the places if you
wish. R5 will probably have to be a 5% type since getting hold of a 1% metal film resistor in
this value may be difficult.
22R R9
75R R29
120R R7, R18
470R R6
1K R17, R24
2K2 R36, R39, R37
3K R2
3K3 R21, R10
3K9 R3
11K R4, R23, R33
22K R8, R19, R20, R22, R27, R28, R35, R34, R38
33K R25, R32, R31, R30, R26
100K R12, R15, R14, R11, R13
150K R16
1M R1
3M3 R5
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Capacitors
100nF axial ceramic C9, C3, C15, C7, C5, C12, C8, C18, C14, C4
33pF C0G 2.5mm ceramic C10, C13
100pF C0G 2.5mm ceramic C16, C17
1uF, 63V electrolytic C2
2u2, 63V electrolytic C6, C11
22uF, 35V electrolytic C1
Discrete Semiconductors
C560 PNP small signal transistor Q1
1N4148 signal diode D1, D2, D3, D4, D5
2V7 zener diode D6, D7
3V9 zener diode D8, D9
LEDs
5mm red round LED PK
5mm green round LED +5V
Two LED clips for front panel and two LED securing rings if required
Integrated Circuits
TL072ACP dual FET op-amp U3, U4, U6
OP275 or OPA2134 dual op-amp U5
LM2903 dual comparator U2
LM4040DIZ-10.0 10V reference U1*
* The LM4040CIZ-10.0 is also suitable.
Potentiometers (Pots)
All pots Alpha 16mm PC mounted types
47K or 50K linear LEVEL1, LEVEL2, LEVEL3, LEVEL4
Three 16mm pot brackets.
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Miscellaneous
Leaded axial ferrite beads L1, L2
MTA156 4 way header PSU – Oakley/MOTM power supply
MTA100 6-way header PWR – Synthesizers.com power supply
Molex/MTA 0.1” header 8-way UPR – for connecting to sockets
Molex/MTA 0.1” housing 8-way UPR – for connecting to sockets
Molex/MTA 0.1” header 4-way LWR – for connecting to sockets
Molex/MTA 0.1” housing 4-way LWR – for connecting to sockets
Other Parts Required
Switchcraft 112APC 1/4” sockets Six off mounted either on the Sock6 board or on panel
Four 20mm or 13/16” Moog style knobs.
Four cable ties.
Around 2m of insulated multistrand hook up wire for the socket connections.
Components required if using optional Sock6 board
Molex/MTA 0.1” header 8-way UPR
Molex/MTA 0.1” housing 8-way UPR
Molex/MTA 0.1” header 4-way LWR
Molex/MTA 0.1” housing 4-way LWR
112APC Switchcraft 1/4” socket SK1, SK2, SK3, SK4, SK5, SK6
The link L1 is not to be fitted on the Sock6 PC .
If using Molex KK you'll also need at least 24 crimp terminals.
Suitable lengths of wire to make up the two interconnects and four cable ties.
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Issue 2 Fourmix Parts List
Resistors
1% 0.25W metal film types are to be recommended simply because they are better quality and
lower noise components. However, 5% ones can be substituted in any of the places if you
wish. R5 will probably have to be a 5% type since getting hold of a 1% metal film resistor in
this value may be difficult.
22R R9
75R R29
120R R7, R18
470R R6
1K R24
2K2 R36, R39, R37
3K R2
3K3 R21, R10
3K9 R3
11K R4, R33
22K R8, R22, R23, R27, R28, R34, R35, R38
33K R25, R32, R31, R30, R26
100K R11, R12, R13, R14, R15, R19, R20
150K R16
1M R1
3M3 R5
Capacitors
100nF axial ceramic C9, C3, C15, C7, C5, C12, C8, C18, C14, C4
33pF C0G 2.5mm ceramic C10, C13
100pF C0G 2.5mm ceramic C16, C17
1uF, 63V electrolytic C2
2u2, 63V electrolytic C6, C11
22uF, 35V electrolytic C1
Discrete Semiconductors
C560 PNP small signal transistor Q1
1N4148 signal diode D1, D2, D3, D4, D5
2V7 zener diode D8, D9
5V1 zener diode D6, D7
LEDs
5mm red round LED PK
5mm green round LED +5V
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Two LED clips for front panel and two LED securing rings if required
Integrated Circuits
TL072ACP dual FET op-amp U3, U4, U6
OP275 or OPA2134 dual op-amp U5
LM2903 dual comparator U2
LM4040DIZ-10.0 10V reference U1*
* The LM4040CIZ-10.0 is also suitable.
Potentiometers (Pots)
All pots Alpha 16mm PC mounted types
47K or 50K linear LEVEL1, LEVEL2, LEVEL3, LEVEL4
Three 16mm pot brackets.
Miscellaneous
Leaded axial ferrite beads L1, L2
MTA156 4 way header PSU – Oakley/MOTM power supply
MTA100 6-way header PWR – Synthesizers.com power supply
Molex/MTA 0.1” header 8-way UPR – for connecting to sockets
Molex/MTA 0.1” housing 8-way UPR – for connecting to sockets
Molex/MTA 0.1” header 4-way LWR – for connecting to sockets
Molex/MTA 0.1” housing 4-way LWR – for connecting to sockets
Other Parts Required
Switchcraft 112APC 1/4” sockets Six off mounted either on the Sock6 board or on panel
Four 20mm or 13/16” Moog style knobs.
Four cable ties.
Around 2m of insulated multistrand hook up wire for the socket connections.
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Components required if using optional Sock6 board
Molex/MTA 0.1” header 8-way UPR
Molex/MTA 0.1” housing 8-way UPR
Molex/MTA 0.1” header 4-way LWR
Molex/MTA 0.1” housing 4-way LWR
112APC Switchcraft 1/4” socket SK1, SK2, SK3, SK4, SK5, SK6
The link L1 is not to be fitted on the Sock6 PC .
If using Molex KK you'll also need at least 24 crimp terminals.
Suitable lengths of wire to make up the two interconnects and four cable ties.
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Connections
Power connections – MOTM and Oakley
The PSU power socket is 0.156” Molex/MTA 4-way header. Friction lock types are
recommended. This system is compatible with MOTM systems.
Power Pin number
+15V 1
Module ground (0V) 2
Earth/PAN 3
-15V 4
Pin 1 on the I/O header has been provided to allow the ground tags of the jack sockets to be
connected to the powers supply ground without using the module’s 0V supply. Earth loops
cannot occur through patch leads this way, although screening is maintained.
Power connections – Synthesizers.com
The PWR power socket is to be fitted if you are using the module with a Synthesizers.com
system. In this case you should not fit the PSU header. The PWR header is a six way 0.1”
MTA, but with the pin that is in location 2 removed. In this way location 3 is actually pin 2 on
my schematic, location 4 is actually pin 5 and so on.
Power Location number Schematic Pin number
+15V 1 1
Missing Pin 2
+5V 3 2
Module ground (0V) 4 3
-15V 5 4
Socket ground* 6 5
+5V is not used on this module, so location 3 (pin 2) is not actually connected to anything on
the PC .
If fitting the PWR header and using it with a standard MU power distribution system, you will
also need to connect together the middle two pads of the PSU header on the main board. This
link connects the socket and panel ground with the module ground. Simply solder a solid wire
hoop made from a resistor lead clipping, or bit of solid core wire, to join to the two middle
pads of PSU.
* Issue 2 Fourmix main boards now connect the unused pin 6 of the MU connector to socket
ground. With the link on PSU not fitted, and using an Oakley MU Dizzy distribution board
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Autres manuels pour 5U
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Table des matières
