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Oberheim Mini-Sequencer
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- Ring Mod / Synth· Oscillators LFOs and Signal Generators
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- Oscillators LFOs and Signal Generators
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 169 rows
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Check before you build · 6 values the reader of this schematic was not sure of
- R29: drawn 41K, read as 47K
- U2: drawn 4060, pinout is a 4050
- Q1: PNP read from arrow direction
- C17: 300pF small and faint
- switch pole counts read from the drawing (Run/Stop/Step DP3T, Seq/S&H/Keyb 6P3T)
- R51: label looks like R61, read as R51
| 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 | 4.7 | 4.7 | drawn 4.7Ω; 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 | drawn 41K, read as 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 | * matched 100K 1% per legend; read from the schematic by eye | |
| R35 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R36 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R37 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R38 | 8.2K | 8.2k | read from the schematic by eye | |
| R39 | 300 | 300 | drawn 300Ω; read from the schematic by eye | |
| R40 | 1M | 1M | read from the schematic by eye | |
| R41 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R42 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R43 | 100K | 100k | * matched 100K 1% per legend; 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 | drawn like "R61" beside C16; R61 is the matched resistor at U2, so read as R51; 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 | * matched 100K 1% per legend; read from the schematic by eye | |
| R56 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R57 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R58 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R59 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R60 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R61 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R62 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R63 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R64 | 301K | 301k | read from the schematic by eye | |
| R65 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R66 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R67 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R68 | 100K | 100k | * matched 100K 1% per legend; read from the schematic by eye | |
| R69 | 100K | 100k | * matched 100K 1% per legend; 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 | * matched 100K 1% per legend; 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 | |
| ×16 | 430K | 430k | one per step pot, both sequences, no designators; read from the schematic by eye | |
| ×1 | 330K | 330k | clock pot to S8, inside the clock panel box, no designator; read from the schematic by eye | |
| ×1 | 1M | 1M | clock box, to -18.5, no designator; read from the schematic by eye | |
| ×1 | 100K | 100k | clock box, to Q1 (SEQ2 OUT), no designator; read from the schematic by eye | |
| ×1 | 1K | 1k | LED common to +14, no designator; note 7: changed to 680Ω effective 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 | drawn .15, legend says all capacitors in uF; 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 | |
| C17 | 300pF | 300p | drawn 300pf beside Q4, small; 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 | drawn 220/16, 16V electrolytic; read from the schematic by eye | |
| C21 | 220uF | 220u | drawn 220/16, 16V electrolytic; 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 | |
| Diodes 1 | ||||
| ×5 | 1N4148 | 1N4148 | undesignated diodes (clock gate inputs x2, S/H peak node, R27 node, C19 clamp); legend: all diodes 1N4148; read from the schematic by eye | |
| Transistors 17 | ||||
| Q1 | 2N3905 | 2N3905 | drawn PNP (emitter follower); legend: all PNP 2N3905; read from the schematic by eye | |
| Q2 | 2N5172 | 2N5172 | NPN per legend; read from the schematic by eye | |
| Q3 | 2N5172 | 2N5172 | NPN per legend (noise source); read from the schematic by eye | |
| Q4 | 2N5172 | 2N5172 | NPN per legend; read from the schematic by eye | |
| Q5 | 2N5172 | 2N5172 | NPN per legend LED driver; read from the schematic by eye | |
| Q6 | 2N5172 | 2N5172 | NPN per legend LED driver; read from the schematic by eye | |
| Q7 | 2N5172 | 2N5172 | NPN per legend LED driver; read from the schematic by eye | |
| Q8 | 2N5172 | 2N5172 | NPN per legend LED driver; read from the schematic by eye | |
| Q9 | 2N5172 | 2N5172 | NPN per legend LED driver; read from the schematic by eye | |
| Q10 | 2N5172 | 2N5172 | NPN per legend LED driver; read from the schematic by eye | |
| Q11 | 2N5172 | 2N5172 | NPN per legend LED driver; read from the schematic by eye | |
| Q12 | 2N5172 | 2N5172 | NPN per legend LED driver; read from the schematic by eye | |
| F1 | 2N4302 | 2N4302 | FET; legend: all FETs 2N4302; read from the schematic by eye | |
| F2 | 2N4302 | 2N4302 | FET; legend: all FETs 2N4302; read from the schematic by eye | |
| F3 | 2N4302 | 2N4302 | FET; legend: all FETs 2N4302; read from the schematic by eye | |
| F4 | 2N4302 | 2N4302 | FET; legend: all FETs 2N4302; Vp 1.1-1.2V selected; read from the schematic by eye | |
| F5 | 2N4302 | 2N4302 | FET; legend: all FETs 2N4302; read from the schematic by eye | |
| ICs 11 | ||||
| U1 | 4022 | 4022 | divide-by-8 counter; read from the schematic by eye | |
| U2 | 4060 | 4060 | drawn 4060, but pinout (1 VDD, 8 VSS, 3-2/5-4/7-6/9-10/11-12/14-15) is a 4050 hex buffer; read from the schematic by eye | |
| U3 | 4024 | 4024 | counter; read from the schematic by eye | |
| U4 | 4016 | 4016 | quad analog switch; read from the schematic by eye | |
| U5 | 4001 | 4001 | quad NOR; read from the schematic by eye | |
| U6 | 4011 | 4011 | quad NAND; read from the schematic by eye | |
| ×5 | 1458 | 1458 | dual op amp, ten sections drawn with no designators; read from the schematic by eye | |
| ×1 | 301A | 301A | op amp, noise amplifier; read from the schematic by eye | |
| ×1 | 748 | 748 | op amp, quantizer comparator; read from the schematic by eye | |
| ×2 | 308 | 308 | op amp, quantizer outputs; read from the schematic by eye | |
| ×1 | 723 | 723 | voltage regulator, +14V; read from the schematic by eye | |
| Potentiometers 19 | ||||
| Clock | B50K | B50k | Potentiometer | drawn 50K LIN, with switch; read from the schematic by eye |
| Lag | A1M | A1M | Potentiometer | drawn 1M LOG; read from the schematic by eye |
| Range | B50K | B50k | Potentiometer | drawn 50K LIN; read from the schematic by eye |
| Seq 1 Step 1 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R1 on the drawing; read from the schematic by eye |
| Seq 1 Step 2 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R2 on the drawing; read from the schematic by eye |
| Seq 1 Step 3 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R3 on the drawing; read from the schematic by eye |
| Seq 1 Step 4 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R4 on the drawing; read from the schematic by eye |
| Seq 1 Step 5 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R5 on the drawing; read from the schematic by eye |
| Seq 1 Step 6 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R6 on the drawing; read from the schematic by eye |
| Seq 1 Step 7 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R7 on the drawing; read from the schematic by eye |
| Seq 1 Step 8 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R8 on the drawing; read from the schematic by eye |
| Seq 2 Step 1 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R1 on the drawing; read from the schematic by eye |
| Seq 2 Step 2 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R2 on the drawing; read from the schematic by eye |
| Seq 2 Step 3 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R3 on the drawing; read from the schematic by eye |
| Seq 2 Step 4 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R4 on the drawing; read from the schematic by eye |
| Seq 2 Step 5 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R5 on the drawing; read from the schematic by eye |
| Seq 2 Step 6 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R6 on the drawing; read from the schematic by eye |
| Seq 2 Step 7 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R7 on the drawing; read from the schematic by eye |
| Seq 2 Step 8 | B50K | B50k | Potentiometer | drawn 50K LIN, labeled R8 on the drawing; read from the schematic by eye |
| Trimmers 3 | ||||
| T1 | 10K | 10k | initial frequency; read from the schematic by eye | |
| T2 | 100K | 100k | read from the schematic by eye | |
| T3 | 1K | 1k | DAC gain, in series with R44; read from the schematic by eye | |
| Switches 6 | ||||
| Clock Switch | SPST | SPST | switch on the Clock pot; read from the schematic by eye | |
| Run/Stop/Step | DP3T | DP3T | lever switch, step position momentary; read from the schematic by eye | |
| S1 | SP8T | SP8T | rotary, sequence length (steps 2-8); read from the schematic by eye | |
| Seq/S&H/Keyb | 6P3T | 6P3T | output mode selector; read from the schematic by eye | |
| Transpose | DP3T | DP3T | Both / Seq 1 / Off; read from the schematic by eye | |
| Analog/Quant | DPDT | DPDT | selects analog or quantized SEQ1/SEQ2 outputs; two poles linked by a dotted line; read from the schematic by eye | |
| LEDs 1 | ||||
| ×8 | LED | LED | step indicator LEDs, no designators or part number; read from the schematic by eye | |