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Buchla 291 Bandpass VCF
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- Other· Filters Wahs and VCFs
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- Filters Wahs and VCFs
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 76 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- D1: drawn only as 5228, presumably a 1N5228 zener
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 40 | ||||
| R1 | 47K | 47k | read from the schematic by eye | |
| R2 | 2M2 | 2.2M | read from the schematic by eye | |
| R3 | 6K8 | 6.8k | read from the schematic by eye | |
| R4 | 33K | 33k | read from the schematic by eye | |
| R5 | 10K | 10k | read from the schematic by eye | |
| R6 | 5K6 | 5.6k | read from the schematic by eye | |
| R8 | 6K8 | 6.8k | read from the schematic by eye | |
| R11 | 10M | 10M | read from the schematic by eye | |
| R12 | 6K8 | 6.8k | read from the schematic by eye | |
| R14 | 10M | 10M | read from the schematic by eye | |
| R15 | 10K | 10k | read from the schematic by eye | |
| R16 | 4K7 | 4.7k | read from the schematic by eye | |
| R18 | 33K | 33k | read from the schematic by eye | |
| R19 | 4K7 | 4.7k | read from the schematic by eye | |
| R20 | 1K5 | 1.5k | read from the schematic by eye | |
| R21 | 1K5 | 1.5k | read from the schematic by eye | |
| R22 | 1M | 1M | read from the schematic by eye | |
| R23 | 15K | 15k | read from the schematic by eye | |
| R24 | 68 | 68 | read from the schematic by eye | |
| R25 | 10K | 10k | read from the schematic by eye | |
| R26 | 15K | 15k | read from the schematic by eye | |
| R27 | 1K | 1k | read from the schematic by eye | |
| R28 | 1K | 1k | read from the schematic by eye | |
| R29 | 1K5 | 1.5k | read from the schematic by eye | |
| R30 | 4M7 | 4.7M | read from the schematic by eye | |
| R31 | 6K8 | 6.8k | read from the schematic by eye | |
| R32 | 10K | 10k | read from the schematic by eye | |
| R33 | 100K | 100k | read from the schematic by eye | |
| R34 | 1K | 1k | read from the schematic by eye | |
| R35 | 220 | 220 | read from the schematic by eye | |
| R36 | 68K | 68k | read from the schematic by eye | |
| R38 | 1K5 | 1.5k | read from the schematic by eye | |
| R39 | 68K | 68k | read from the schematic by eye | |
| R42 | 68K | 68k | read from the schematic by eye | |
| R43 | 68K | 68k | read from the schematic by eye | |
| R45 | 47K | 47k | read from the schematic by eye | |
| R48 | 1K | 1k | read from the schematic by eye | |
| R49 | 1K | 1k | read from the schematic by eye | |
| R50 | 1K | 1k | read from the schematic by eye | |
| R51 | 1K | 1k | read from the schematic by eye | |
| Capacitors 16 | ||||
| C1 | 1000pF | 1n | read from the schematic by eye | |
| C2 | 22nF | 22n | read from the schematic by eye | |
| C3 | 220pF | 220p | read from the schematic by eye | |
| C4 | 15uF | 15u | electrolytic; read from the schematic by eye | |
| C5 | 22nF | 22n | read from the schematic by eye | |
| C6 | 470pF | 470p | read from the schematic by eye | |
| C7 | 47pF | 47p | read from the schematic by eye | |
| C8 | 470nF | 470n | read from the schematic by eye | |
| C9 | 10uF | 10u | 35V electrolytic; read from the schematic by eye | |
| C10 | 10uF | 10u | 35V electrolytic; read from the schematic by eye | |
| C11 | .1uF | 100n | supply decoupling; read from the schematic by eye | |
| C12 | .1uF | 100n | supply decoupling; read from the schematic by eye | |
| C13 | .1uF | 100n | supply decoupling; read from the schematic by eye | |
| C14 | .1uF | 100n | supply decoupling; read from the schematic by eye | |
| C15 | .1uF | 100n | supply decoupling; read from the schematic by eye | |
| C16 | .1uF | 100n | supply decoupling; read from the schematic by eye | |
| Diodes 2 | ||||
| D1 | 5228 | 5228 | likely 1N5228 zener (3.9V); read from the schematic by eye | |
| D2 | 1N4148 | 1N4148 | read from the schematic by eye | |
| Transistors 2 | ||||
| Q1 | 2N3566 | 2N3566 | read from the schematic by eye | |
| Q2 | 2N3566 | 2N3566 | read from the schematic by eye | |
| ICs 3 | ||||
| U1 | NE5534 | NE5534 | read from the schematic by eye | |
| U2 | TL082 | TL082 | read from the schematic by eye | |
| U3 | TL084 | TL084 | section U3D is labelled TL082 on the drawing; the power table and pin 14 output mark U3 as a TL084; read from the schematic by eye | |
| Opto 4 | ||||
| VT1 | VTL5C3 | VTL5C3 | read from the schematic by eye | |
| VT2 | VTL5C3 | VTL5C3 | read from the schematic by eye | |
| VT3 | VTL5C3 | VTL5C3 | read from the schematic by eye | |
| VT4 | VTL5C3 | VTL5C3 | read from the schematic by eye | |
| Inductors 2 | ||||
| L1 | 10 | 10H | drawn as a 10 ohm resistor in the -15V rail; read from the schematic by eye | |
| L2 | 10 | 10H | drawn as a 10 ohm resistor in the +15V rail; read from the schematic by eye | |
| Potentiometers 7 | ||||
| R47 | B100K | B100k | Potentiometer | input level, 100K Lin; read from the schematic by eye |
| FM Level | B50K | B50k | Potentiometer | R46, 50K Lin; read from the schematic by eye |
| Initial Cent Freq | B10K | B10k | Potentiometer | R37, 10K Lin; read from the schematic by eye |
| R40 | B10K | B10k | Potentiometer | 10K Lin, Center Freq CV input attenuator; read from the schematic by eye |
| Initial Bandwidth | B10K | B10k | Potentiometer | R41, 10K Lin; read from the schematic by eye |
| Band Mod Level | B10K | B10k | Potentiometer | R44, 10K Lin; read from the schematic by eye |
| Resonance Level | 5K | 5k | Potentiometer | R7, wired as variable resistor; could be a trimmer; read from the schematic by eye |