Enclosure not stated
Buchla 292 Lowpass Gate or Dynamics Manager
- Category
- Noise Gate· Compressors Gates and Limiters
- Price
- see vendor
- Tags
- Compressors Gates and Limiters
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 38 rows
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Check before you build · 4 values the reader of this schematic was not sure of
- C2: drawing labels two capacitors C3 (220pf and 1µfd); the 1µfd was renumbered C2
- R8: unclear whether trimmer or panel pot
- SW: switch drawn as a single arrow between the R18 and R22 lines; read as SPDT
- 7/8/9: op amp designators drawn only as numbers inside the triangles
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 22 | ||||
| R2 | 150k | 150k | read from the schematic by eye | |
| R3 | 470k | 470k | read from the schematic by eye | |
| R4 | 100k | 100k | read from the schematic by eye | |
| R7 | 10k | 10k | read from the schematic by eye | |
| R9 | 33k | 33k | read from the schematic by eye | |
| R10 | 4.7k | 4.7k | read from the schematic by eye | |
| R11 | 470 | 470 | drawn 470Ω; read from the schematic by eye | |
| R12 | 100k | 100k | 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 | 10k | 10k | read from the schematic by eye | |
| R17 | 1M | 1M | drawn 1meg; read from the schematic by eye | |
| R18 | 100k | 100k | read from the schematic by eye | |
| R21 | 1M | 1M | drawn 1meg; read from the schematic by eye | |
| R22 | 100k | 100k | read from the schematic by eye | |
| R25 | 10k | 10k | read from the schematic by eye | |
| R26 | 4.7M | 4.7M | drawn 4.7meg; read from the schematic by eye | |
| R27 | 1k | 1k | read from the schematic by eye | |
| ×2 | 15k | 15k | 1%, supply splitter; read from the schematic by eye | |
| ×2 | 10k | 10k | 1%, -7.5V inverter; read from the schematic by eye | |
| ×2 | 4.7k | 4.7k | supply splitter; read from the schematic by eye | |
| Capacitors 6 | ||||
| C1 | .002uF | 2n | read from the schematic by eye | |
| C2 | 1uF | 1u | drawn as a second C3 (1µfd at the signal input); renumbered; read from the schematic by eye | |
| C3 | 220pF | 220p | read from the schematic by eye | |
| C4 | .0047uF | 4.7n | read from the schematic by eye | |
| C5 | 910pF | 910p | read from the schematic by eye | |
| ×2 | 1uF | 1u | electrolytic, +7.5V and -7.5V rails; read from the schematic by eye | |
| Diodes 1 | ||||
| D1 | Diode | DIODE | zener, no part number given; read from the schematic by eye | |
| ICs 5 | ||||
| 7 | ? | ? | op amp, no part number given; read from the schematic by eye | |
| 8 | ? | ? | op amp, no part number given; read from the schematic by eye | |
| 9 | ? | ? | op amp, no part number given; read from the schematic by eye | |
| ×1 | ? | ? | dual op amp for the ±7.5V supply, no part number given; read from the schematic by eye | |
| K1 | 4016 | 4016 | CMOS analog switch, three sections used, run at ±7.5V; read from the schematic by eye | |
| Opto 1 | ||||
| Vc1 | Vactrol | VACTROL | LED plus two LDRs, no part number given; read from the schematic by eye | |
| Potentiometers 1 | ||||
| R1 | 10k | 10k | Potentiometer | CV offset pot; read from the schematic by eye |
| Trimmers 1 | ||||
| R8 | 20k | 20k | variable resistor (wiper tied to one end), may be a front-panel control; read from the schematic by eye | |
| Switches 1 | ||||
| ×1 | SPDT | SPDT | gate / lowpass mode select; read from the schematic by eye | |