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Oberheim SBX
- Category
- Ring Mod / Synth· Full Synths Drum Synths and Misc Synth
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- see vendor
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- Full Synths Drum Synths and Misc Synth
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 88 rows
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Check before you build · 5 values the reader of this schematic was not sure of
- 44.2K 1% (x2, osc expo bias): could be 49.2K
- 49.9K 1% (filter V/oct): hand lettering, could be 42.9K
- Transistors: drawn without designators; 24 counted, NPN/PNP split estimated
- 79L15A: lower regulator label cut off at the page edge
- Resistor counts by value: undesignated parts counted by eye across overlapping tiles, may be off by one or two
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 42 | ||||
| ×8 | 10 | 10 | read from the schematic by eye | |
| ×4 | 220 | 220 | read from the schematic by eye | |
| ×2 | 470 | 470 | read from the schematic by eye | |
| ×2 | 680 | 680 | read from the schematic by eye | |
| ×6 | 1K | 1k | read from the schematic by eye | |
| ×1 | 1K | 1k | 1%; read from the schematic by eye | |
| ×2 | 1K | 1k | 1% tempco (TC), oscillator expo compensation; read from the schematic by eye | |
| ×4 | 1.5K | 1.5k | read from the schematic by eye | |
| ×3 | 2.2K | 2.2k | read from the schematic by eye | |
| ×2 | 2.7K | 2.7k | read from the schematic by eye | |
| ×2 | 3.3K | 3.3k | read from the schematic by eye | |
| ×3 | 4.7K | 4.7k | read from the schematic by eye | |
| ×2 | 6.2K | 6.2k | read from the schematic by eye | |
| ×15 | 10K | 10k | read from the schematic by eye | |
| ×1 | 12K | 12k | read from the schematic by eye | |
| ×2 | 16.2K | 16.2k | 1%; read from the schematic by eye | |
| ×2 | 18K | 18k | read from the schematic by eye | |
| ×6 | 18.2K | 18.2k | 1%; read from the schematic by eye | |
| ×5 | 22K | 22k | read from the schematic by eye | |
| ×2 | 24K | 24k | read from the schematic by eye | |
| ×2 | 28.7K | 28.7k | 1%; read from the schematic by eye | |
| ×1 | 33K | 33k | read from the schematic by eye | |
| ×2 | 44.2K | 44.2k | 1%; read from the schematic by eye | |
| ×7 | 47K | 47k | read from the schematic by eye | |
| ×1 | 49.9K | 49.9k | 1%; read from the schematic by eye | |
| ×2 | 57.6K | 57.6k | 1%; read from the schematic by eye | |
| ×2 | 59K | 59k | 1%; read from the schematic by eye | |
| ×2 | 68K | 68k | read from the schematic by eye | |
| ×2 | 68.1K | 68.1k | 1%; read from the schematic by eye | |
| ×1 | 82K | 82k | read from the schematic by eye | |
| ×15 | 100K | 100k | read from the schematic by eye | |
| ×9 | 100K | 100k | marked * on the drawing: matched 100K 1%; read from the schematic by eye | |
| ×2 | 120K | 120k | read from the schematic by eye | |
| ×1 | 220K | 220k | read from the schematic by eye | |
| ×2 | 330K | 330k | read from the schematic by eye | |
| ×2 | 511K | 511k | 1%; read from the schematic by eye | |
| ×2 | 715K | 715k | 1%; read from the schematic by eye | |
| ×2 | 750K | 750k | 1%; read from the schematic by eye | |
| ×2 | 820K | 820k | read from the schematic by eye | |
| ×1 | 1M | 1M | read from the schematic by eye | |
| ×2 | 1.5M | 1.5M | 1%; read from the schematic by eye | |
| ×2 | 4.7M | 4.7M | read from the schematic by eye | |
| Capacitors 10 | ||||
| ×2 | .001uF | 1n | envelope timing caps; read from the schematic by eye | |
| ×1 | 10pF | 10p | read from the schematic by eye | |
| ×3 | 100pF | 100p | read from the schematic by eye | |
| ×2 | 330pF | 330p | mica, filter poles; read from the schematic by eye | |
| ×2 | 1000pF | 1n | polystyrene, oscillator timing; read from the schematic by eye | |
| ×2 | .022uF | 22n | read from the schematic by eye | |
| ×2 | .047uF | 47n | read from the schematic by eye | |
| ×3 | .1uF | 100n | read from the schematic by eye | |
| ×3 | 6.8uF | 6.8u | electrolytic; output coupling and regulator inputs; read from the schematic by eye | |
| ×2 | 100uF | 100u | 25V; regulator outputs; read from the schematic by eye | |
| Diodes 1 | ||||
| ×5 | 1N4148 | 1N4148 | notes: all diodes are 1N4148; read from the schematic by eye | |
| Transistors 3 | ||||
| ×14 | MPS5172 | MPS5172 | NPN per the notes; the NPN/PNP split of the 20 bipolar transistors is approximate; read from the schematic by eye | |
| ×6 | 2N3905 | 2N3905 | PNP per the notes; split approximate; read from the schematic by eye | |
| ×4 | 2N4302 | 2N4302 | FET per the notes; two per oscillator core; read from the schematic by eye | |
| ICs 21 | ||||
| A1 | 741 | 741 | read from the schematic by eye | |
| A2 | 741 | 741 | read from the schematic by eye | |
| A3 | 3086 | 3086 | transistor array shared by both oscillators; read from the schematic by eye | |
| A4 | 741 | 741 | read from the schematic by eye | |
| A5 | 741 | 741 | read from the schematic by eye | |
| A6 | TL081 | TL081 | read from the schematic by eye | |
| A7 | 4053 | 4053 | three sections used (both oscillator wave selects and filter tracking); read from the schematic by eye | |
| A8 | TL081 | TL081 | read from the schematic by eye | |
| A9 | TL081 | TL081 | read from the schematic by eye | |
| A10 | 3080 | 3080 | read from the schematic by eye | |
| A11 | TL082 | TL082 | both halves used in the filter; read from the schematic by eye | |
| A12 | 3080 | 3080 | read from the schematic by eye | |
| A13 | 3080 | 3080 | read from the schematic by eye | |
| A14 | 3080 | 3080 | read from the schematic by eye | |
| A15 | 3080 | 3080 | read from the schematic by eye | |
| A16 | 741 | 741 | read from the schematic by eye | |
| A17 | TL081 | TL081 | read from the schematic by eye | |
| A18 | CEM3310 | CEM3310 | filter envelope; read from the schematic by eye | |
| A19 | CEM3310 | CEM3310 | amplifier envelope; read from the schematic by eye | |
| ×1 | 78L15A | 78L15A | +15V regulator on the card; read from the schematic by eye | |
| ×1 | 79L15A | 79L15A | -15V regulator on the card; part number partly hidden, read by symmetry; read from the schematic by eye | |
| Trimmers 11 | ||||
| T1 | 100K | 100k | osc 2 init freq; read from the schematic by eye | |
| T2 | 10K | 10k | osc 2 HF track; read from the schematic by eye | |
| T3 | 10K | 10k | osc 2 init PW; read from the schematic by eye | |
| T4 | 100K | 100k | osc 1 init freq; read from the schematic by eye | |
| T5 | 10K | 10k | osc 1 HF track; read from the schematic by eye | |
| T6 | 10K | 10k | osc 1 V/oct, 15-turn; read from the schematic by eye | |
| T7 | 10K | 10k | osc 2 V/oct, 15-turn; read from the schematic by eye | |
| T8 | 10K | 10k | osc 1 init PW; read from the schematic by eye | |
| T9 | 100K | 100k | filter init freq; read from the schematic by eye | |
| T10 | 10K | 10k | filter V/oct; read from the schematic by eye | |
| T11 | 100K | 100k | VCA offset; read from the schematic by eye | |