Enclosure not stated
Roland 703BC VCF
Based on the Roland 703BC VCF
- Category
- Other· Filters Wahs and VCFs
- Price
- see vendor
- Tags
- Filters Wahs and VCFs
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 97 rows
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Check before you build · 7 values the reader of this schematic was not sure of
- R16, R18, R21, R35, R36, R37, R50: designators faint, assigned from position and numbering
- R20: value struck out, illegible
- R37: could be 15K or 1.5K
- R40, R41: values faint, read as 1M
- C11: value faint
- Q1/Q2: part numbers faint (2SC945Q / 2SC735Q)
- VR6, VR12: values faint
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 51 | ||||
| R1 | 100K | 100k | read from the schematic by eye | |
| R2 | 100K | 100k | read from the schematic by eye | |
| R3 | 100K | 100k | read from the schematic by eye | |
| R4 | 100K | 100k | read from the schematic by eye | |
| R5 | 100K | 100k | read from the schematic by eye | |
| R6 | 100K | 100k | read from the schematic by eye | |
| R7 | 100K | 100k | read from the schematic by eye | |
| R8 | 100K | 100k | read from the schematic by eye | |
| R9 | 100K | 100k | read from the schematic by eye | |
| R10 | 100K | 100k | read from the schematic by eye | |
| R11 | 15K | 15k | read from the schematic by eye | |
| R12 | 56K | 56k | read from the schematic by eye | |
| R13 | 100K | 100k | read from the schematic by eye | |
| R14 | 15K | 15k | read from the schematic by eye | |
| R15 | 15K | 15k | read from the schematic by eye | |
| R16 | 47K | 47k | designator faint, read by position; read from the schematic by eye | |
| R17 | 100 | 100 | read from the schematic by eye | |
| R18 | 100 | 100 | designator faint; read from the schematic by eye | |
| R19 | 22k | 22k | value changed for serial *1 (old value struck out); designator faint; read from the schematic by eye | |
| R20 | ? | ? | 1/2W; values struck out for serial *2, may be deleted in later units; designator faint; read from the schematic by eye | |
| R21 | 10K | 10k | designator faint; read from the schematic by eye | |
| R22 | 100K | 100k | read from the schematic by eye | |
| R23 | 100 | 100 | read from the schematic by eye | |
| R24 | 22k | 22k | value changed for serial *2; read from the schematic by eye | |
| R25 | 270K | 270k | read from the schematic by eye | |
| R26 | 560 | 560 | 1/2W; read from the schematic by eye | |
| R27 | 560 | 560 | 1/2W; read from the schematic by eye | |
| R28 | 68K | 68k | read from the schematic by eye | |
| R29 | 5.6K | 5.6k | read from the schematic by eye | |
| R30 | 47 | 47 | read from the schematic by eye | |
| R31 | 1.5K | 1.5k | read from the schematic by eye | |
| R32 | 4.7K | 4.7k | read from the schematic by eye | |
| R33 | 10K | 10k | read from the schematic by eye | |
| R34 | 1M | 1M | read from the schematic by eye | |
| R35 | 15K | 15k | designator faint; read from the schematic by eye | |
| R36 | 1.5K | 1.5k | designator faint; read from the schematic by eye | |
| R37 | 15K | 15k | in series with VR12; designator and value faint; read from the schematic by eye | |
| R38 | 15K | 15k | read from the schematic by eye | |
| R39 | 33K | 33k | read from the schematic by eye | |
| R40 | 1M | 1M | faint; read from the schematic by eye | |
| R41 | 1M | 1M | faint; read from the schematic by eye | |
| R42 | 4.7M | 4.7M | 1/2W; read from the schematic by eye | |
| R43 | 10K | 10k | read from the schematic by eye | |
| R44 | 1M | 1M | read from the schematic by eye | |
| R45 | 10K | 10k | read from the schematic by eye | |
| R46 | 10K | 10k | read from the schematic by eye | |
| R47 | 2.2K | 2.2k | read from the schematic by eye | |
| R48 | 1K | 1k | read from the schematic by eye | |
| R49 | 10K | 10k | read from the schematic by eye | |
| R50 | 100K | 100k | designator and value faint; read from the schematic by eye | |
| R51 | 100K | 100k | read from the schematic by eye | |
| Capacitors 12 | ||||
| C1 | 10uF | 10u | 16V electrolytic; read from the schematic by eye | |
| C4 | 470pF | 470p | changed from .0015 (struck out); read from the schematic by eye | |
| C6 | 470pF | 470p | changed from .0015 (struck out); read from the schematic by eye | |
| C8 | 10uF | 10u | 16V non-polarized; read from the schematic by eye | |
| C9 | .01uF | 10n | read from the schematic by eye | |
| C10 | .01uF | 10n | read from the schematic by eye | |
| C11 | 1uF | 1u | electrolytic; value faint; read from the schematic by eye | |
| C12 | .1uF | 100n | read from the schematic by eye | |
| C13 | .1uF | 100n | read from the schematic by eye | |
| C14 | 1uF | 1u | tantalum; read from the schematic by eye | |
| C15 | 1uF | 1u | tantalum; read from the schematic by eye | |
| C16 | 1uF | 1u | non-polarized; read from the schematic by eye | |
| Diodes 4 | ||||
| D1 | 1S1555 | 1S1555 | read from the schematic by eye | |
| D2 | 1S1555 | 1S1555 | read from the schematic by eye | |
| D6 | 1N4003 | 1N4003 | read from the schematic by eye | |
| D7 | 1N4003 | 1N4003 | read from the schematic by eye | |
| Transistors 5 | ||||
| Q1 | 2SC945Q | 2SC945Q | NPN; part number faint; read from the schematic by eye | |
| Q2 | 2SC735Q | 2SC735Q | NPN; part number faint; read from the schematic by eye | |
| Q3 | 2SC945Q | 2SC945Q | NPN; read from the schematic by eye | |
| Q4 | 2SC945Q | 2SC945Q | NPN; read from the schematic by eye | |
| Q5 | 2SC945Q | 2SC945Q | NPN; read from the schematic by eye | |
| ICs 8 | ||||
| IC1 | LM741C | LM741C | op amp; read from the schematic by eye | |
| IC2 | CA3140AT | CA3140AT | replaced LM301 from serial *2; read from the schematic by eye | |
| IC3 | CA3080 | CA3080 | OTA; selected; read from the schematic by eye | |
| IC4 | CA3140AT | CA3140AT | replaced LM301 from serial *2; read from the schematic by eye | |
| IC5 | CA3080 | CA3080 | OTA; selected; read from the schematic by eye | |
| IC6 | CA3140AT | CA3140AT | replaced LM301 from serial *2; read from the schematic by eye | |
| IC7 | LM741C | LM741C | op amp; read from the schematic by eye | |
| IC8 | CD4001BE | CD4001BE | quad NOR; replaced CD4001AE from serial *1; read from the schematic by eye | |
| Potentiometers 11 | ||||
| VR1 | A100K | A100k | Potentiometer | VCO-1 input level; read from the schematic by eye |
| VR2 | A100K | A100k | Potentiometer | VCO-2 input level; read from the schematic by eye |
| VR3 | A100K | A100k | Potentiometer | VCO-3 input level; read from the schematic by eye |
| VR4 | A100K | A100k | Potentiometer | ring mod input level; read from the schematic by eye |
| VR5 | A100K | A100k | Potentiometer | external input level; read from the schematic by eye |
| VR6 | B100K | B100k | Potentiometer | ADSR/envelope CV amount; value faint; read from the schematic by eye |
| VR7 | B100K | B100k | Potentiometer | LFO CV amount; read from the schematic by eye |
| VR8 | B100K | B100k | Potentiometer | CV amount; read from the schematic by eye |
| VR9 | B100K | B100k | Potentiometer | CV In amount; read from the schematic by eye |
| Cutoff Freq | B50K | B50k | Potentiometer | VR10; read from the schematic by eye |
| Resonance | A50K | A50k | Potentiometer | VR13, dual-gang; read from the schematic by eye |
| Trimmers 2 | ||||
| VR11 | 10K | 10k | CO Freq Offset; read from the schematic by eye | |
| VR12 | B100K | 100k | CO Freq width; value faint; read from the schematic by eye | |
| Switches 2 | ||||
| S1 | SPDT | SPDT | envelope source select; read from the schematic by eye | |
| Filter Mode | SP3T | SP3T | S2, HP/BP/LP; read from the schematic by eye | |
| LEDs 2 | ||||
| D3 | GL32AR | GL32AR | red; read from the schematic by eye | |
| D4 | GL32PG | GL32PG | green; read from the schematic by eye | |