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Oakley OMS-820 - page 1
Oakley Sound Syste ms Oakley Modular Series OMS-8 20 issue 2 The MO TM- 820 Companion Modul e User’s Guide V2.01 Tony Al l good B.Eng Oakl ey Sound Sys tem s CARL ISLE CA4 9QR Un ited Ki n gdo m 1 ...
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Oakley OMS-820 - page 2
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Oakley OMS-820 - page 3
Introduction The OMS-820 is a compan i on modu le to the MOTM-820 voltage controlled la g pro cessor. I t adds powerful new features to the superb Sy nthe s is Tech nolog y modu le. No component chan ge s are needed to the MOTM modul e, and the tw o module s are connecte d t oge ther by jus t one removab le c onne ctor hi dde n beh i nd the front p ...
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Oakley OMS-820 - page 4
automatica ll y. Remo v in g the gate has no eff ect on the o utpu t. This is 'one shot' mode. However, the out put may be force d t o decay prematurel y by pressi n g the RES ET push button, or by use of the RESE T in put. A positi ve sig na l of above 3V or so wil l activ ate reset. Switch to AR a nd Resetab le mode. The MOTM outpu t wi ...
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Oakley OMS-820 - page 5
voltage across the capacitor wi l l direct ly cont rol the o utpu t of the MOTM modul e. Wh en the OMS-820 is connected up it wil l suppl y the in put voltage to t he MOTM and thus the max imu m lev e l appl i ed to that capacitor. It also ne eds t o keep an eye on the ou tpu t voltage to o. As wit h man y el ectroni c ci rcu its the OMS-820 can be ...
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Oakley OMS-820 - page 6
agai n, as it crosses zero volts, the o p- amp swi ng s and the switc her responds... and the process repeats agai n and agai n and agai n. Of course, the speed a t wh ic h the process repea ts is set by the UP and DOW N pots . You can get very fa st at a round 1000 c omp lete cy c le s a second, and you can get ver y slow . Very slow in de ed. On ...
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Oakley OMS-820 - page 7
In GATED mode, remov i ng the gate wi l l reset the fl ip - f lop . The AUTO swit ch in its UP positio n wi l l pass a n in ve rted gate sig na l t o a second di ff e re ntia tor, C5, R22 and D4. Whe n a gate sig na l is removed, the positi ve goin g edg e runs through U 4 (pin s 1,2,3 & 11,12,13) and D4 to reset the fl i p- flo p. In this mode ...
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Oakley OMS-820 - page 8
and DOW N poi nts in the MOTM-820. These al low the MOTM-820’s own pot s to be used as in put att enuators whi l st be in g ab l e to s et the abso lute rise and fal l time s wi th the OMS-820. Feel free to mak e any change s to the circu it to im pro ve or alter the performa nce . If you do, do drop the Oakl ey - Sy nth s ma il in g lis t an e-m ...
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Oakley OMS-820 - page 9
U4 is a 4001 devic e, and is part of the cla ss i c 4000 series of CMOS log ic. Many compan ie s mak e thi s dev ice and as such the devi ce ends up hav in g al l sor ts of nam es . eg. CD4001, MC14001, 4001BE. Al l types shou l d work but t ry to avoid the 4001UBE, this is an ol der devi ce and i s ver y prone t o static damag e. Either way a good ...
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Oakley OMS-820 - page 10
390R R5 39K R26, R11, R20, R 12, R27, R2 47K R39, R45, R47, R 41 4K7 R42, R36, R37, R 44 82K R1 Capacitors 100nF poly e ster fi l m 5mm box C12, C11, C1, C 3 10nF poly e ster fi l m 5mm box C4 1nF poly e ster fi l m 5mm box C6, C5 22uF, 35V radial electrol yti c C8, C2, C7 2u2, 63V radia l ele ctrolyt ic C9, C10 Discr ete Semiconductors 1N4148 or 1 ...
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Oakley OMS-820 - page 11
Populat ing the Oakley OMS-8 20 PC B Warning: Oakl ey Modular PCBs are now suppl ie d with the RoHS compl ia n t Ni/ Au fi n i s h . Thi s is a hig h qual it y fi n is h but d oes possess sl ig h tl y dif f er ent solder ing characteri stics to the traditiona l le ad base d HASL fi n i s h . Hand le the boards with care, and avoid tou chin g the Ni ...
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Oakley OMS-820 - page 12
The sm al l e r ele ctrolyt ic capac itors are very often suppli e d with 0.1” lea d spac i ng. My boards hav e a hole spac i ng of 0.2”. This me an s that the undersid e of these radial capacitors wi ll not go fl at ont o the board. This is del ib e rate to all ow the water wash to wo rk, so don’t force the part in to o hard. The capacitors ...
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Oakley OMS-820 - page 13
Al l you ne ed to do is e-mai l the fpd f i l e t o Schae ff er i n Germ an y , or Frontpanel Express in the US, and the y do the rest. You can als o use the Frontplatten Desi gn er progr am' s own onli n e ordering procedu re whic h also works very we ll . The pane l is b lac k with white engraved le ge nd in g. The pane l its el f is mad e f ...
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Oakley OMS-820 - page 14
The Schae f fer pane l database uses 6.3m m di am eter hol es wh ich a re desig ne d for Cli p l it e LED len se s ava i la b l e fro m Map li n in t he UK. Other LED lens es ma y be used wit h a suita bl e siz ed hole, although you may hav e al ter the pr ocedure below sl ig ht l y to suit your chose n cl ip s. The LEDs are abl e to be sold ered d ...
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Oakley OMS-820 - page 15
The SCR pad on t he PCB has been provi ded to al lo w the ground tags of the jac k sockets to be connected to the p ower suppl y gro und without usi ng the modu le’ s 0V suppl y. Ear th loops cannot occur thro ugh patch lea ds this wa y, a lthough screen in g is ma i nta i ne d. Of course, this can only work if al l your modul es fol l ow this pr ...
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Oakley OMS-820 - page 16
do muc h on its own, but if it start s to smoke or of an yth i ng gets hot then yo u’ ve done someth i ng wrong. Now to wire the int erconn ect. You need a 4-way 0.1” fem al e plug. These are normal l y desi gne d t o be crim p ed but t hey can be easi l y s olde red with care. Make each wi re to be 25c m long . I norma l l y strip ba ck the wi ...
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Oakley OMS-820 - page 17
Testing Sin ce there are t wo sections , we wil l test each one in turn. The easi est and the best t o test fir st is the LFO fun ctio n. Si mp l y fli p the LFO/EG switch in to the LFO mode. Set all the UP and DOWN po ts to their m i n i m u m , and ma ke sure the MOTM’s b ypa ss fu nct ion is off. Now set the UP/DOWN control t o positio n 7. Th ...
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Oakley OMS-820 - page 18
Final Comment s If you hav e any problem s wit h the modu le, an ex cel l e nt source of support is the Oakle y- S yn ths Group that can be foun d at http: //lau nch .groups.yah oo.com/grou p/oa kle y- s y nth s/ If you can' t get your project t o wor k, then Oakl ey So und Syst ems are able to offer a 'get you working ' serv ice . I ...
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