VRG issue 1 Builder`s Guide
Contents
1. Notice how the LIN mode gives rise to sharper sounds while the EXP is more natural in the way it opens and closes the VCA or filter Still using the VRG as a traditional attack decay EG verify the operation of the CV input sockets and controls Remember that the controls are reversible attenuators and the minimum setting is in the middle of the rotation If all this happens the chances are that you have a working module and it is now time to calibrate The User Manual gives full details on how to calibrate your module 13 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 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 builder s 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 que2. On the VRG printed circuit board I have provided space for the four main control pots If you use the specified 16mm Alpha pots and matching brackets the PCB can be held very firmly to the panel without any additional mounting procedures The pot spacing on this board is different to many of our other 5U modules instead of 1 625 it is 1 375 Used in conjunction with smaller 20mm diameter knobs this still allows for an attractive module design and finger friendly tweaking The design requires plus and minus 15V supplies The power supply should be adequately regulated The current consumption is 44mA and 37mA Power is routed onto the main PCB by either our standard four way 0 156 MTA156 type connector or the special five way Synthesizers com MTA100 header The four pins are 15V ground earth panel ground 15V The earth panel connection allows you to connect the metal front panel to the power supply s ground without it sharing the modules ground line More about this later The main PCB has four mounting holes for M3 bolts one near each corner These are not required for panel mounting if you are using the three 16mm pot brackets The board size is 109mm deep x 124mm high 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 VRG issue Parts List For general information regarding where to get
3. 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 luF 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 1 0 25W or 0 4W metal film resistors are recommended R15 can be 5 0 25W 22R R26 75R R31 220R R62 1K 3000ppm K PTC R11 R22 1K5 R60 ple R53 R68 3K3 RI 3K6 R54 4K7 R19 R20 10K R6 R2 R35 R5 R50 R51 R48 R36 15K R61 R52 20K R30 R37 22K R32 R33 R24 R28 R27 R29 TK R12 R23 47K R39 R55 R43 R41 R63 R58 R45 R66 R57 R56 R67 R44 R65 R16 R18 R64 75K R40 R42 82K R47 100K R7 R21 R10 R9 R38 R8 120K R25 R13 R46 R4 R14 R3 560K R59 1M R34 R17 R49 3M3 RIS Capacitors 100nF axial ceramic Cl C7 C8 C10 C11 C12 C14 C15 C16 C17 C18 C20 C21 22pF COG 2 5mm ceramic C4 C5 100pF COG 2 5mm ceramic C13 InF 63V polyester C3 C6 100nF 63V polyester C9 C19 2u2 63V electrolytic C22 C23 22
4. soldered from the underside and the excess wire on snipped off ve s k Va The prototype unit showing the solid core wire connections between the toggle switches and the PCB 11 Wiring the LED The VRG features a bi colour LED and this is wired in similar fashion to other Oakley 5U modules I recommend that you use a twisted wire pair to connect the LED to the board ae Vf Vi A clear LED lens and matching clip holds the LED into the panel The Molex KK housing and crimps make a reliable solderless connection to the LED s leads 12 Testing the VRG Apply power to the unit making sure you are applying the power correctly Check that no device is running hot Any sign of smoke or strange smells turn off the power immediately and recheck the polarity of the power supply the two transistors Q1 and Q2 the direction of the ICs in their sockets and the polarity of the electrolytic capacitors Select the LFO mode using the three way switch You should notice the LED start to glow or flash Check that turning the UP and DOWN controls affect the speed of the flash Start with both controls fully counter clockwise and then turn up the down control At first the LED should be a blur of red and green Only at lower speeds will you notice the separate colours With the down pot at it s maximum setting the LED should take a long time to change colour and intensity Now check that with the down pot at its lowest setting ie fast c
5. N EXP selection Both switches are mounted on the panel and wired to the board with fly wires see later for details Miscellaneous Leaded axial ferrite beads Ll 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 Molex MTA 0 1 housing 2 way Optional connection method for the LED LED clip and lens Other Parts Required Switchcraft 112APC 1 4 sockets Six off mounted either on the Sock6 board or on panel Four 20mm knobs Around 2m of insulated multistrand hook up wire for the switch and 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 L1 on the Sock6 PCB is not to be fitted 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 You should fill any unused solder pads with solder In the VRG this means the unused power supply header location and all the little via holes Connections Power
6. Oakley Sound Systems SU Oakley Modular Series Versatile Ramp Generator VRG PCB Issue 1 Builder s Guide V1 0 2 Tony Allgood B Eng PGCE Oakley Sound Systems CARLISLE United Kingdom Introduction This is the Project Builder s Guide for the issue 1 Versatile Ramp Generator VRG 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 board or 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 vrg 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 The Issue 1 VRG PCB a ge R D gt ad 2 3 3 g gid a toe wie esd ee C1 Tet es 2 22 AG e 2 D t Cc This is the prototype issue 1 Oakley VRG 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
7. 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 GND 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 OV supply Earth loops cannot occur through patch leads this way although screening is maintained Of course this can only work if all your modules follow this principle It s worth filling the empty holes of the PWR pads with solder 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 Missing Pin 5V Module GND 15V Not connected 1 NNnBWN aA BW NWN 5V is not used on this module so location 3 pin 2 is not actually connected to anything on the PCB If fitting the PWR header you will also need to link out pins 2 and 3 of PSU This connects the panel ground with the module ground Simply solder a solid wire hoop made from a resistor lead clipping to join the middle two pads
8. e can then be used to connect those connected earth tags to pin 1 of LWR Pin 1 is the square solder pad All the other connections are connected to the signal or NC lugs of the sockets The tables below show the connections you need to make UPR Pin Pad name Socket Lug Type Pin Module ground GATE IN NC Pin2 GATE IN GATE IN Signal Pin3 UPCV_IN DOWN CV NC Pin4 DOWNCV_IN DOWN CV Signal Pin5 Module ground UP CV NC Pin6 UPCV_IN UP CV Signal Pin7 SLEW NC SLEW IN NC Pin8 SLEW IN SLEW IN Signal LWR Pin Pad name Socket Lug Type Pin 1 Panel ground Connects to all sockets Ground lugs Pin2 NEG OUT NEG OUT Signal Pin3 Not used Pin4 SLEW OUT OUTPUT Signal 10 Wiring the Switches The VRG features two different types of switch The three position ON OFF ON switch should go to the top of the module while the ordinary two position ON OFF switch should go to the middle hole in the panel The ON OFF ON switch has all three tangs connected to the board and the ON OFF one has just the two lower ones connected You should wire each switch as you would other Oakley modules I typically use thin solid core wire rather than insulated multi strand wire This keeps the connection firmly in place and very neat I normally bend the wire at one end into a hook and place the straight end into the PCB pad s hole I then loop the hooked end around the switch tang and squash the hook into place before soldering it The solder pad on the board can then be
9. hanging the up control has a similar effect on the speed of the pulsating You can verify the LFO s behaviour by plugging it into another module in your system Try modulating the frequency of an audio VCO or a self oscillating filter Note that flicking between the LIN and EXP modes changes the sound somewhat as well as the frequency of the modulation The LIN mode should produce a faster modulation from the VRG If you require a brighter light from the LED then you can reduce the value of R60 I don t recommend that you go below IK though as this will draw excessive current from your power supply Now select ONE SHOT The VRG should now stop oscillating Connect a short patch lead between the NEG OUT and the GATE input The VRG should start oscillating again but this time the LED should only be one colour as the VRG s output is now only going from 0 6V to around 5V I normally wire my bi colour LEDs to go red with a positive output voltage so here I would expect to see a red pulsating light Again flicking between LIN and EXP should reveal that the LIN mode produces faster pulses Remove the patch lead from NEG OUT Select TRAD AD on the VRG and use a gate signal from your modular to trigger the VRG s attack decay envelope generator EG Use the VRG s output to modulate a VCA or filter Check that the up and down controls behave in the same way as attack and decay would on a normal ADSR Listen to the difference between the LIN and EXP modes
10. of PSU together Building the VRG module using the Sock6 board This is the simplest way of connecting all the sockets to the main board The Sock6 board should be populated in the way described in our construction guide found on the project webpage There are only two headers UPR for upper which is eight way and LWR for lower which is four way Both headers are fitted to the bottom side of the board The wire link L1 should not be fitted to the Sock6 board You need to make up two interconnects The eight way one should be made so that it is 95mm long The four way should be made to be 110mm The VRG prototype module showing the detail of the board to board interconnect Here I have used the Molex KK 0 1 system to connect the Sock6 to the main PCB Hand wiring the sockets If you have bought Switchcraft 112A sockets you will see that they have three connections One is the earth or ground tag One is the signal tag which will be connected to the tip of the jack plug when it is inserted The third tag is the normalised tag or NC normally closed tag The NC tag is internally connected to the signal tag when a jack is not connected This connection is automatically broken when you insert a jack Once fitted to the front panel the ground tags of each socket can be all connected together with solid wire I use 0 91mm diameter tinned copper wire for this job It is nice and stiff so retains its shape A single piece of insulated wir
11. stions 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 the Synth diy and Analogue Heaven mailing lists and those at Muffwiggler com Tony Allgood at Oakley Sound Cumbria UK November 2011 updated January 2012 No part of this document may be copied by whatever means without my permission 14
12. uF 35V electrolytic C2 Discrete Semiconductors The polarisation of the 1N4148 diodes D16 and D17 are incorrectly marked on the PCB legend They should be fitted so that the black band on the diode is towards the top of the board Thus all four diodes D16 through to D19 should all be facing the same way 1N4148 signal diode D1 D2 D13 D14 D15 D16 D17 D19 D6 D5 2V7 zener diode D10 D11 6V2 zener diode D9 D12 D18 BAT 42 Schottky diode D3 D4 D7 D8 BC550 NPN small signal transistor Q1 Q2 5mm bi colour LED red green LED Integrated Circuits 4001BE CMOS NOR gate DG403DJ dual analogue switch THAT340 NPN PNP array LT1013CP AD712 dual FET op amp TLO72CN dual FET op amp TLO74CN quad FET op amp LM4040DIZ 10 0 10V reference N 3 U6 2 4 U 5 1 U U U U U U4 U8 U9 U10 U U x U2 should be a good quality FET if you want the lowest error voltages on your output signal However you get quite acceptable results using just a TL072CN The LM4040CIZ 10 0 is also suitable IC sockets are to be recommended You need seven 8 pin two 14 pin and one 16 pin DIL sockets Trimmers preset resistors 5K multiturn cermet GAIN Potentiometers Pots All pots Alpha 16mm PCB mounted types 47K or 50K linear UP DOWN UP_CV DOWN_CV Three 16mm pot brackets Switches One single pole ON OFF ON toggle switch is required for the mode selection One single pole ON OFF toggle switch is required for the LI
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