Enclosure not stated · 2 knobs
BOSS SG-1 2
Based on the Boss SG-1 2
- Category
- Ring Mod / Synth· Guitar Synth and Misc Signal Shapers
- Controls
- Sensitivity · Attack
- Price
- see vendor
- Tags
- Guitar Synth and Misc Signal Shapers
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 34 rows
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Check before you build · 2 values the reader of this schematic was not sure of
- Trimmer: drawing itself says 25k?
- Two resistors drawn '1m' taken as 1M
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 14 | ||||
| ×5 | 1k | 1k | input series, Sensitivity to ground, op amp supply, Check LED, Attack switch base; read from the schematic by eye | |
| ×2 | 220k | 220k | input bias, op amp + input bias; read from the schematic by eye | |
| ×3 | 10k | 10k | Q1 emitter, VCA control divider, output buffer emitter; read from the schematic by eye | |
| ×3 | 22k | 22k | signal series; two in the 4.5V supply divider; read from the schematic by eye | |
| ×2 | 470k | 470k | FET drain bias; flip-flop to attack transistor; read from the schematic by eye | |
| ×1 | 3.3k | 3.3k | control node from +9V; read from the schematic by eye | |
| ×5 | 1M | 1M | FET gate, op amp feedback, cancel bias, plus two drawn '1m' (buffer base bias and series to FET gate); read from the schematic by eye | |
| ×1 | 47k | 47k | control node series; read from the schematic by eye | |
| ×5 | 100k | 100k | output pulldown, two envelope-detector, two flip-flop cross-coupling; read from the schematic by eye | |
| ×1 | 390k | 390k | op amp output to driver; read from the schematic by eye | |
| ×1 | 3.9k | 3.9k | op amp gain leg; read from the schematic by eye | |
| ×2 | 4.7k | 4.7k | phase-splitter collector and emitter; read from the schematic by eye | |
| ×4 | 56k | 56k | flip-flop collector and base resistors; read from the schematic by eye | |
| ×1 | 22 | 22 | Cancel switch series; read from the schematic by eye | |
| Capacitors 10 | ||||
| ×1 | 0.1uF | 100n | input, drawn 0.1; read from the schematic by eye | |
| ×9 | 1uF | 1u | drawn 1u (7) and 1uf (2); read from the schematic by eye | |
| ×1 | 47uF | 47u | control node; read from the schematic by eye | |
| ×1 | 0.5uF | 500n | control node to ground; read from the schematic by eye | |
| ×1 | 0.022uF | 22n | op amp input, drawn 0.022; read from the schematic by eye | |
| ×3 | 10uF | 10u | op amp supply, envelope hold, 4.5V supply; drawn 10; read from the schematic by eye | |
| ×1 | 0.001uF | 1n | driver base, drawn 0.001; read from the schematic by eye | |
| ×1 | 0.047uF | 47n | envelope, drawn 0.047; read from the schematic by eye | |
| ×4 | 47pF | 47p | flip-flop speed-up and trigger caps; read from the schematic by eye | |
| ×1 | 30uF | 30u | 9V supply filter; read from the schematic by eye | |
| Diodes 1 | ||||
| ×6 | 1N914 | 1N914 | silicon signal diode, 1N914 OK; read from the schematic by eye | |
| Transistors 3 | ||||
| ×2 | 2SC932 | 2SC932 | NPN input and output buffers; read from the schematic by eye | |
| ×1 | 2SK30A | 2SK30A | N-JFET VCA; read from the schematic by eye | |
| ×6 | 2SC1815 | 2SC1815 | NPN: driver, two envelope, two flip-flop, attack switch; read from the schematic by eye | |
| ICs 1 | ||||
| ×1 | ? | ? | op amp, no part number given; read from the schematic by eye | |
| Potentiometers 2 | ||||
| Sensitivity | 100k | 100k | Potentiometer | read from the schematic by eye |
| Attack | 20k | 20k | Potentiometer | read from the schematic by eye |
| Trimmers 1 | ||||
| ×1 | 25k | 25k | drawn 'trimmer, 25k?' - value questioned on the drawing; read from the schematic by eye | |
| Switches 1 | ||||
| Cancel | SPST | SPST | momentary pushbutton; read from the schematic by eye | |
| LEDs 1 | ||||
| ×1 | LED | LED | "Check" indicator; color not given; read from the schematic by eye | |