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Oberheim OB-8, Instruction Manual

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Summary of Contents for OB-8

Page 1: ...n is output through the DAC to whatever destination is selected If for example the triangle wave of the LFO should be at its peak then a high voltage will be output to the destination When the LFO sho...

Page 2: ...ated to A4 with ECO 410 First power the unit on Verify all voltage sources 5 5 15 and 15 at connectors I and 0 Calibrate the 15 supply using T2 to or lOmv Calibrate the 5 supply using T1 to or 5mv The...

Page 3: ...cate that the Modulation Lever trimmer can now be adjusted Either one or both of the inside Pot Board LEDs hereafter called test LEDs will be on If both LEDs are on this trimmer is already properly ca...

Page 4: ...per Voice Board and repeat the procedure of the Lower Board Be sure to write each offset into memory with the ARPEGGIATE button After the Release Decay and Attack parameters have been calibrated the F...

Page 5: ...calibrating oscilator 1 using the first 8 white keys to select which voice is being calibrated Adjust oscillator 2 s volts per octave trimmers T103 T203 T3Q3 etc until all 8 voices are calibrated To...

Page 6: ...an or 10 cents hundredths of a semitone the processor will light a corresponding LED for the drifting oscillator s The bottom row of LEDs in the programmer section of the front panel except for the MA...

Page 7: ...ve trimmer T106 until the interval is one octave Verify this adjustment by playing notes 2 or 3 octaves apart and determining that the octaves are in tune Next adjust the resonance trimmer T104 down w...

Page 8: ...increments the program counter and causes a fetch of the next instruction another NOP in this case This technique forces the processor to address the entire memory address space despite failures in t...

Page 9: ...BSW1 G19 CEN H19 _ VOICE 1 20 HMRQ E20 D1A G20 POTO H20 D2A 21 HWR E21 D5A G21 SWD7 H21 _ A3 22 HINT E22 DOA G22 SWDQ H22 _ D6A 23 BUSAKA E23 D3A G23 LR07 H23 _ A2 24 3USRQ E24 D4A G24 SWD1 H24 D1A 25...

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Page 16: ...Q8ERHE M ELECTRONICS JNC SCHEMATIC OS 6 VOICE BOAAD j a...

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Page 18: ...OBEJ2HEIM ELECTRON CS LNC SCHEMATIC CfrS terBOAZD uz XK 68 S...

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Page 20: ...LOWER ONLY...

Page 21: ...AS vj i j tz 7k Mi a s JO ZZ CAPAC TOXS 6 8 ro 22uf A2 TAA TALUM OP ELECTPOLYT C 2 AU D QDES APE A 4 8 3 ALL PES SLOPS APS ft AT SX OBEME M ELECm V CSML SCHEMAL C 08 0 SEMD OAP JTP 6308...

Page 22: ...onnector is used to pass MIDI information which was generated by another synthesizer ccmputer Information played on an 08 8 is not available at it s own MIDI THRU connector BASIC CONNECTION The simple...

Page 23: ...uld be the MIDI version of acoustical feedback I amspice OB 6 cir IN THRU MIDI a n n 1 WTSl ZOV kCg OUT IN TWOJ MIDI OB 6 fji III T 1 11 1 Figure 4 SIMPLE CHAIN It is possible to connect synthesizers...

Page 24: ...B 8 will DOUBLE the notes played by the OB 8 Also you can use the OB 8 to merely pass the DSX information to the MIDI OUT connector causing any synthesizer with MIDI IN to be controlled by the DSX Fig...

Page 25: ...Occc data F7H dddd cccc System Exclusive Oberheim I D no Device number 03 8 s 01H Command Byte 1 Program data dump follows Command Byte 2 Program number Program data see note 4 End of System Exclusiv...

Page 26: ...2 1 i BYTE 1 VCA REL 6 BITS UNI50N 0 BYTE 2 VCF DCY 6 BITS FILTER OSC 2 FM FM BYTE 3 VCA DCY 6 BIT5 05C 2 WAVEFORM 1 0 BYTE 4 VCF ATK 6 BITS 0SC 1 WAVEFORM 1 0 BYTE 5 VCA ATK 6 BITS 05C 2 OSC 1 PWM PW...

Page 27: ...m tiur BYTE 13 PWM AMNT 6 BITS JriU 3 2 BYTE 14 PORT AMT 6 BITS 1 0 BYTE 15 VC02 DETUNE 6 BITS VCO 2 PW 5 4 BYTE 16 VCF FREQ 6 BITS 3 2 BYTE 17 VC02 FREQ 6 BITS 1 0 BYTE 18 VC01 FREQ 6 BITS SPARE LEGA...

Page 28: ...B 8 may also be operated in OMNI OFF mode If the OB 8 is a receiver it will now receive ONLY on the selected Basic Channel If the 0B 8 is used as transmitter it will now transmit the upper half of the...

Page 29: ...ram to MIDI NOTE SWITCH A PROGRAM ENABLE MUST BE ENABLED FOR A DUMP TO OCCUR TRACK Sequencer Re Enable Turn off MIDI Notes IMPORTANT The OB 8 cannot RECEIVE MIDI info and be run by the DSX sequencer s...

Page 30: ...3 4 GR OUk D E Control vjolr vse OoT ICeWtSoAR D CokuoEx TOE P K Pt J oU DECODE BOFBD fOKKO 2 PlO MOLC 1 12 OO 2 a J o A3 4 1 CA4 G 3 A C 2 Cal 1 1 5k di 8 4 l v iCBoV JO EEw Powt Collector P KJ fl o...

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