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Oberheim Mini Sequencer
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- Ring Mod / Synth· Full Synths Drum Synths and Misc Synth
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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 154 rows
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Check before you build · 6 values the reader of this schematic was not sure of
- Q3: emitter arrow unclear; noise transistor taken as NPN 2N5172
- R39: drawn 500Ω, could be a trimmer
- Seq/S/H/Keyb: two 3-position slide switches, pole count read as 3; listed as one row covering both
- Run/Stop/Step: read as a 2-pole 3-position slide switch
- ×1 100pF: likely C17
- ×6 diodes: count from the drawing, none designated
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 86 | ||||
| R1 | 220K | 220k | read from the schematic by eye | |
| R2 | 100K | 100k | read from the schematic by eye | |
| R3 | 3.9K | 3.9k | read from the schematic by eye | |
| R4 | 4.7K | 4.7k | read from the schematic by eye | |
| R5 | 150K | 150k | read from the schematic by eye | |
| R6 | 390K | 390k | read from the schematic by eye | |
| R7 | 47K | 47k | read from the schematic by eye | |
| R8 | 390K | 390k | read from the schematic by eye | |
| R9 | 100K | 100k | read from the schematic by eye | |
| R10 | 150K | 150k | read from the schematic by eye | |
| R11 | 33K | 33k | read from the schematic by eye | |
| R12 | 100K | 100k | read from the schematic by eye | |
| R13 | 4.7M | 4.7M | read from the schematic by eye | |
| R14 | 4.7M | 4.7M | read from the schematic by eye | |
| R15 | 1K | 1k | read from the schematic by eye | |
| R16 | 2.2K | 2.2k | read from the schematic by eye | |
| R17 | 1M | 1M | read from the schematic by eye | |
| R18 | 100K | 100k | read from the schematic by eye | |
| R19 | 100K | 100k | read from the schematic by eye | |
| R20 | 47K | 47k | read from the schematic by eye | |
| R21 | 100K | 100k | read from the schematic by eye | |
| R22 | 4.7K | 4.7k | read from the schematic by eye | |
| R23 | 33K | 33k | read from the schematic by eye | |
| R24 | 4.7Ω | 4.7 | read from the schematic by eye | |
| R25 | 12.1K | 12.1k | 1%; read from the schematic by eye | |
| R26 | 12.1K | 12.1k | 1%; read from the schematic by eye | |
| R27 | 330K | 330k | read from the schematic by eye | |
| R28 | 47K | 47k | read from the schematic by eye | |
| R29 | 47K | 47k | read from the schematic by eye | |
| R30 | 1M | 1M | read from the schematic by eye | |
| R31 | 180K | 180k | read from the schematic by eye | |
| R32 | 100K | 100k | read from the schematic by eye | |
| R33 | 1M | 1M | read from the schematic by eye | |
| R34 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R35 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R36 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R37 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R38 | 8.2K | 8.2k | read from the schematic by eye | |
| R39 | 500Ω | 500 | read from the schematic by eye | |
| R40 | 1M | 1M | read from the schematic by eye | |
| R41 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R42 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R43 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R44 | 8.87K | 8.87k | 1%; read from the schematic by eye | |
| R45 | 1M | 1M | read from the schematic by eye | |
| R46 | 12.1K | 12.1k | 1%; read from the schematic by eye | |
| R47 | 12.1K | 12.1k | 1%; read from the schematic by eye | |
| R48 | 6.2K | 6.2k | read from the schematic by eye | |
| R49 | 4.7K | 4.7k | read from the schematic by eye | |
| R50 | 33K | 33k | read from the schematic by eye | |
| R51 | 10K | 10k | read from the schematic by eye | |
| R52 | 47K | 47k | read from the schematic by eye | |
| R53 | 47K | 47k | read from the schematic by eye | |
| R54 | 100K | 100k | read from the schematic by eye | |
| R55 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R56 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R57 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R58 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R59 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R60 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R61 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R62 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R63 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R64 | 301K | 301k | read from the schematic by eye | |
| R65 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R66 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R67 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R68 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R69 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R70 | 100K | 100k | read from the schematic by eye | |
| R71 | 6.2K | 6.2k | read from the schematic by eye | |
| R72 | 100K | 100k | marked * = matched 100K, 1%; read from the schematic by eye | |
| R73 | 33K | 33k | read from the schematic by eye | |
| R74 | 33K | 33k | read from the schematic by eye | |
| R75 | 33K | 33k | read from the schematic by eye | |
| R76 | 33K | 33k | read from the schematic by eye | |
| R77 | 33K | 33k | read from the schematic by eye | |
| R78 | 33K | 33k | read from the schematic by eye | |
| R79 | 33K | 33k | read from the schematic by eye | |
| R80 | 33K | 33k | read from the schematic by eye | |
| R81 | 6.2K | 6.2k | read from the schematic by eye | |
| ×1 | 330K | 330k | clock-rate network, off-board; read from the schematic by eye | |
| ×1 | 1M | 1M | clock-rate network to -18.5, off-board; read from the schematic by eye | |
| ×1 | 100K | 100k | clock-rate network to Q1 pad, off-board; read from the schematic by eye | |
| ×16 | 430K | 430k | step-pot mixing resistors, two rows of 8; read from the schematic by eye | |
| ×1 | 680Ω | 680 | LED string resistor; drawn 1K, note 7: changed to 680 ohm July 1979; read from the schematic by eye | |
| Capacitors 25 | ||||
| C1 | .047uF | 47n | read from the schematic by eye | |
| C2 | .047uF | 47n | read from the schematic by eye | |
| C3 | .0047uF | 4.7n | read from the schematic by eye | |
| C4 | .15uF | 150n | read from the schematic by eye | |
| C5 | .01uF | 10n | read from the schematic by eye | |
| C6 | .0047uF | 4.7n | read from the schematic by eye | |
| C7 | 5pF | 5p | read from the schematic by eye | |
| C8 | .047uF | 47n | read from the schematic by eye | |
| C9 | .047uF | 47n | read from the schematic by eye | |
| C10 | .0022uF | 2.2n | read from the schematic by eye | |
| C11 | .0022uF | 2.2n | read from the schematic by eye | |
| C12 | 100pF | 100p | read from the schematic by eye | |
| C13 | 6.8uF | 6.8u | electrolytic; read from the schematic by eye | |
| C14 | .0047uF | 4.7n | read from the schematic by eye | |
| C15 | .0047uF | 4.7n | read from the schematic by eye | |
| C16 | .001uF | 1n | read from the schematic by eye | |
| C18 | .001uF | 1n | read from the schematic by eye | |
| C19 | .001uF | 1n | read from the schematic by eye | |
| C20 | 220uF | 220u | electrolytic, 16V; read from the schematic by eye | |
| C21 | 220uF | 220u | electrolytic, 16V; read from the schematic by eye | |
| C22 | .01uF | 10n | read from the schematic by eye | |
| C23 | .01uF | 10n | read from the schematic by eye | |
| C24 | 30pF | 30p | read from the schematic by eye | |
| C25 | 30pF | 30p | read from the schematic by eye | |
| ×1 | 100pF | 100p | across R50 at Q4 base; designator not printed (C17 is the only number missing from C1-C25); read from the schematic by eye | |
| Diodes 1 | ||||
| ×6 | 1N4148 | 1N4148 | undesignated; note 5: all diodes 1N4148 (two at U6 inputs, F3 sample/hold, R27, after C19, sequence-length selector); read from the schematic by eye | |
| Transistors 17 | ||||
| Q1 | 2N3905 | 2N3905 | PNP (note 4); read from the schematic by eye | |
| Q2 | 2N5172 | 2N5172 | NPN (note 3); read from the schematic by eye | |
| Q3 | 2N5172 | 2N5172 | noise source; NPN assumed (note 3), arrow unclear; read from the schematic by eye | |
| Q4 | 2N5172 | 2N5172 | NPN (note 3); read from the schematic by eye | |
| Q5 | 2N5172 | 2N5172 | NPN (note 3); read from the schematic by eye | |
| Q6 | 2N5172 | 2N5172 | NPN (note 3); read from the schematic by eye | |
| Q7 | 2N5172 | 2N5172 | NPN (note 3); read from the schematic by eye | |
| Q8 | 2N5172 | 2N5172 | NPN (note 3); read from the schematic by eye | |
| Q9 | 2N5172 | 2N5172 | NPN (note 3); read from the schematic by eye | |
| Q10 | 2N5172 | 2N5172 | NPN (note 3); read from the schematic by eye | |
| Q11 | 2N5172 | 2N5172 | NPN (note 3); read from the schematic by eye | |
| Q12 | 2N5172 | 2N5172 | NPN (note 3); read from the schematic by eye | |
| F1 | 2N4302 | 2N4302 | JFET (note 6); read from the schematic by eye | |
| F2 | 2N4302 | 2N4302 | JFET (note 6); read from the schematic by eye | |
| F3 | 2N4302 | 2N4302 | JFET (note 6); read from the schematic by eye | |
| F4 | 2N4302 | 2N4302 | JFET (note 6); read from the schematic by eye | |
| F5 | 2N4302 | 2N4302 | JFET (note 6); read from the schematic by eye | |
| ICs 11 | ||||
| U1 | 4022 | 4022 | read from the schematic by eye | |
| U2 | 4050 | 4050 | read from the schematic by eye | |
| U3 | 4024 | 4024 | read from the schematic by eye | |
| U4 | 4016 | 4016 | read from the schematic by eye | |
| U5 | 4001 | 4001 | read from the schematic by eye | |
| U6 | 4011 | 4011 | read from the schematic by eye | |
| ×5 | 1458 | 1458 | dual op amp; 10 sections drawn, no designators; read from the schematic by eye | |
| ×1 | 301A | 301A | LM301A, noise amplifier; read from the schematic by eye | |
| ×2 | 308 | 308 | LM308, quantizer outputs; read from the schematic by eye | |
| ×1 | 748 | 748 | LM748 comparator stage; read from the schematic by eye | |
| ×1 | 723 | 723 | LM723 regulator, +14V; read from the schematic by eye | |
| Potentiometers 4 | ||||
| Clock | B50K | B50k | Potentiometer | 50K lin, with switch; read from the schematic by eye |
| Lag | A1M | A1M | Potentiometer | 1M log; read from the schematic by eye |
| Range | B50K | B50k | Potentiometer | 50K lin; read from the schematic by eye |
| ×16 | B50K | B50k | Potentiometer | step pots, 50K lin, two rows of 8; read from the schematic by eye |
| Trimmers 3 | ||||
| T1 | 10K | 10k | freq trim; read from the schematic by eye | |
| T2 | 100K | 100k | read from the schematic by eye | |
| T3 | 1K | 1k | read from the schematic by eye | |
| Switches 6 | ||||
| ×1 | SPST | SPST | on the Clock pot; read from the schematic by eye | |
| Run/Stop/Step | DP3T | DP3T | 3-position slide; read from the schematic by eye | |
| Seq/S/H/Keyb | 3P3T | 3P3T | ×2, one per output channel; 3-position slide; read from the schematic by eye | |
| Transpose | DP3T | DP3T | Both/Seq1/Off; read from the schematic by eye | |
| ×1 | SP8T | SP8T | sequence length selector, positions 1-8; read from the schematic by eye | |
| ×2 | SPDT | SPDT | Seq 1 / Seq 2 out: analog or quantized; read from the schematic by eye | |
| LEDs 1 | ||||
| ×8 | LED | LED | step indicators, no part number given; read from the schematic by eye | |