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Summary of Contents for Oakley RM-4014
- Page 1 Oakley Sound Systems Oakley Modular Eurorack Series RM-4014 Ring Modulator PCB Issue 3E Builder's Guide V3.1.0 Tony Allgood Oakley Sound Systems CARLISLE United Kingdom...
- Page 2 Introduction This is the Project Builder's Guide for the issue 3E RM-4014 Ring Modulator Euro 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, a circuit description, and a list of the various interconnections.
- Page 3 The Issue 3E Ring Modulator PCB This is the issue 3E Euro sized Ring Modulator board fully populated and awaiting panel mounting and sockets wiring. This is one of our smaller format PCBs. The module is designed to fit into a Euro rack. The pots are Alpha/ALPS 16mm types with matching brackets.
- Page 4 Ring Modulator issue 3E Parts List 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.
- Page 5 Discrete Semiconductors 1N4004 rectifier diode D7, D8 1N4148 signal diode D1, D2, D3, D4, D5, D6 BC550 NPN transistor Q2, Q4 BC560 PNP transistor Q1, Q3 Integrated Circuits TL072 dual op-amp U2, U3 THAT320P PNP array THAT300P NPN array Variable Resistors 50K or 100K multiturn trimmer BAL1, BAL2, GAIN 100K linear Alpha 16mm pot...
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Page 6: Circuit Description
The Oakley Ring modulator is based around the old ARP module 4014. This was built on an incredibly tightly cramped circuit board which was then securely potted, with a very hard epoxy compound, into a small plastic box. - Page 7 VCA sections. The very first Oakley ring modulator module built to replace a dead ARP-4014 module in an ARP2600 synthesiser. The Oakley RM-4014 module borrows heavily from the design shown here.
- Page 8 Each pair would then be made by selecting two devices from the same bin. This would take too much time when you only want to build one or two Oakley Ring Modulators, so I have used pre-matched quad transistor arrays. The THAT300 is four matched NPN transistors, and the THAT320 is four matched PNP transistors.
- Page 9 Y input is present. Power is supplied via the usual 10-way 0.1” header. As is the custom for Oakley modules, I have used ferrite beads to act as high frequency filters on the power lines. Decoupling at the point of entry is provided by C13 and C15 for the positive rail, and C14 and C16 for the negative rail.
- Page 10 Connections Power is admitted to the module via a boxed 10-way IDC header. The sockets are connected via an optional 8-way Molex 'strip and crimp' style 0.1” header and housing. Power connections Power is provided via the standard Doepfer power header system. This is a 10 way header based on a 2 x 5 0.1”...
- Page 11 But in either case any Oakley module wired in such way will still be compatible with any other Euro module. The current version of the Krisp1 Oakley Ring Mod. Older versions have only two input sockets and two switches.
- Page 12 I will only go into the details of wiring up a panel with the five 3.5mm sockets. One variant of the Krisp1 built RM-4014 uses only three sockets, one output and two inputs, but has also two switches to select between AC and DC inputs. This replicates the circuit of the original 2600.
- Page 13 Use multistrand hook up wire to connect each socket lug to the relevant pin on the header. Keep your wires short but not too short and you can use as many different colour wires as you can – although I tend to use one colour because I'm a minimalist. There is absolutely no need to use screened cable for such short runs.
- Page 14 Testing, testing, 1, 2, 3... 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, and the direction of the ICs in their sockets. Assuming everything is OK so far, it is time to apply an audio input.
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Page 15: Final Comments
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.
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