Enclosure not stated · 2 knobs
Polyfusion VCF
Schematic
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Parts list 33 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- 10K: one JFET source resistor in stage B is drawn '.10K', read as 10K like the other three
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 16 | ||||
| ×10 | 1K | 1k | 8 in the four filter stages (JFET drains and 3080 pin 5), 2 at the 2N3906 pair bases; read from the schematic by eye | |
| ×8 | 100 | 100 | 3080 A-D input pins to ground; read from the schematic by eye | |
| ×1 | 620 | 620 | signal output series; read from the schematic by eye | |
| ×2 | 2K | 2k | around 3080 E; read from the schematic by eye | |
| ×1 | 4.7K | 4.7k | 2N3906 pair emitter; read from the schematic by eye | |
| ×1 | 5.1K | 5.1k | Range trimmer string; read from the schematic by eye | |
| ×1 | 5.6K | 5.6k | feedback into 3080 A; read from the schematic by eye | |
| ×8 | 10K | 10k | 4 JFET source loads (one drawn '.10K', read as 10K), 1458 A input and feedback, H.F. comp, 3080 E feedback; read from the schematic by eye | |
| ×2 | 15K | 15k | 2N3906 pair collector and 1458 B + input; read from the schematic by eye | |
| ×8 | 20K | 20k | filter ladder resistors; read from the schematic by eye | |
| ×2 | 27K | 27k | 1458 A + input to ground and 2N3906 pair base feed; read from the schematic by eye | |
| ×1 | 36K | 36k | 741 A feedback; read from the schematic by eye | |
| ×2 | 43K | 43k | Freq CV scale string and 741 C + input; read from the schematic by eye | |
| ×4 | 51K | 51k | 3 around 741 A input, 1 in the Range string; read from the schematic by eye | |
| ×11 | 100K | 100k | read from the schematic by eye | |
| ×2 | 300K | 300k | Freq and Reson pot wiper resistors; read from the schematic by eye | |
| Capacitors 3 | ||||
| ×5 | 100pF | 100p | 4 on 3080 outputs, 1 on 1458 B feedback; read from the schematic by eye | |
| ×1 | 330pF | 330p | 3080 E feedback; read from the schematic by eye | |
| ×1 | .22uF | 220n | output coupling to 741 B; read from the schematic by eye | |
| Diodes 1 | ||||
| ×1 | 1N4148 | 1N4148 | read from the schematic by eye | |
| Transistors 2 | ||||
| ×4 | E-112 | E-112 | JFET buffers after each 3080; read from the schematic by eye | |
| ×3 | 2N3906 | 2N3906 | PNP; 2 are a matched pair (exponential converter), 1 in the resonance CV path; read from the schematic by eye | |
| ICs 3 | ||||
| ×3 | 741 | 741 | op amps A, B, C; read from the schematic by eye | |
| ×5 | 3080 | 3080 | OTAs A-E; read from the schematic by eye | |
| ×2 | 1458 | 1458 | dual op amps; two sections drawn 'A' and two 'B'; read from the schematic by eye | |
| Potentiometers 2 | ||||
| Freq | B25K | B25k | Potentiometer | 25K lin; read from the schematic by eye |
| Reson | B25K | B25k | Potentiometer | 25K lin; read from the schematic by eye |
| Trimmers 6 | ||||
| Offset | 100K | 100k | signal offset; read from the schematic by eye | |
| Scale | 20K | 20k | Freq CV scale; read from the schematic by eye | |
| Range | 5K | 5k | read from the schematic by eye | |
| H.F. Comp | 100K | 100k | read from the schematic by eye | |
| R-Sym | 100K | 100k | read from the schematic by eye | |
| R-Cal | 100K | 100k | read from the schematic by eye | |