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Oakley MOTM-820 User Manual
Summary of MOTM-820
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Oakley sound systems oakley modular series oms-820 issue 2 the motm-820 companion module user’s guide v2.01 tony allgood b.Eng oakley sound systems carlisle ca4 9qr united kingdom 1.
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Introduction the oms-820 is a companion module to the motm-820 voltage controlled lag processor. It adds powerful new features to the superb synthesis technology module. No component changes are needed to the motm module, and the two modules are connected together by just one removable connector hid...
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Automatically. Removing the gate has no effect on the output. This is 'one shot' mode. However, the output may be forced to decay prematurely by pressing the reset push button, or by use of the reset input. A positive signal of above 3v or so will activate reset. Switch to ar and resetable mode. The...
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Voltage across the capacitor will directly control the output of the motm module. When the oms-820 is connected up it will supply the input voltage to the motm and thus the maximum level applied to that capacitor. It also needs to keep an eye on the output voltage too. As with many electronic circui...
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Again, as it crosses zero volts, the op-amp swings and the switcher responds... And the process repeats again and again and again. Of course, the speed at which the process repeats is set by the up and down pots. You can get very fast at around 1000 complete cycles a second, and you can get very slo...
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In gated mode, removing the gate will reset the flip-flop. The auto switch in its up position will pass an inverted gate signal to a second differentiator, c5, r22 and d4. When a gate signal is removed, the positive going edge runs through u4 (pins 1,2,3 & 11,12,13) and d4 to reset the flip-flop. In...
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And down points in the motm-820. These allow the motm-820’s own pots to be used as input attenuators whilst being able to set the absolute rise and fall times with the oms-820. Feel free to make any changes to the circuit to improve or alter the performance. If you do, do drop the oakley-synths mail...
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U4 is a 4001 device, and is part of the classic 4000 series of cmos logic. Many companies make this device and as such the device ends up having all sorts of names. Eg. Cd4001, mc14001, 4001be. All types should work but try to avoid the 4001ube, this is an older device and is very prone to static da...
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390r r5 39k r26, r11, r20, r12, r27, r2 47k r39, r45, r47, r41 4k7 r42, r36, r37, r44 82k r1 capacitors 100nf polyester film 5mm box c12, c11, c1, c3 10nf polyester film 5mm box c4 1nf polyester film 5mm box c6, c5 22uf, 35v radial electrolytic c8, c2, c7 2u2, 63v radial electrolytic c9, c10 discret...
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Populating the oakley oms-820 pcb warning: oakley modular pcbs are now supplied with the rohs compliant ni/au finish. This is a high quality finish but does possess slightly different soldering characteristics to the traditional lead based hasl finish. Handle the boards with care, and avoid touching...
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The smaller electrolytic capacitors are very often supplied with 0.1” lead spacing. My boards have a hole spacing of 0.2”. This means that the underside of these radial capacitors will not go flat onto the board. This is deliberate to allow the water wash to work, so don’t force the part in too hard...
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All you need to do is e-mail the fpd file to schaeffer in germany, or frontpanel express in the us, and they do the rest. You can also use the frontplatten designer program's own online ordering procedure which also works very well. The panel is black with white engraved legending. The panel itself ...
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The schaeffer panel database uses 6.3mm diameter holes which are designed for cliplite led lenses available from maplin in the uk. Other led lenses may be used with a suitable sized hole, although you may have alter the procedure below slightly to suit your chosen clips. The leds are able to be sold...
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The scr pad on the pcb has been provided to allow the ground tags of the jack sockets to be connected to the power supply ground without using the module’s 0v supply. Earth loops cannot occur through patch leads this way, although screening is maintained. Of course, this can only work if all your mo...
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Do much on its own, but if it starts to smoke or of anything gets hot then you’ve done something wrong. Now to wire the interconnect. You need a 4-way 0.1” female plug. These are normally designed to be crimped but they can be easily soldered with care. Make each wire to be 25cm long. I normally str...
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Testing since there are two sections, we will test each one in turn. The easiest and the best to test first is the lfo function. Simply flip the lfo/eg switch into the lfo mode. Set all the up and down pots to their minimum, and make sure the motm’s bypass function is off. Now set the up/down contro...
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Final comments if you have any problems with the module, an excellent source of support is the oakley-synths group that can be found at http://launch.Groups.Yahoo.Com/group/oakley-synths/ if you can't get your project to work, then oakley sound systems are able to offer a 'get you working' service. ...