Enclosure not stated · 3 knobs
Maxon OD 820
Based on the Maxon OD-820· 6 other boards clone it
From the post
Slightly modified power section and a protection diode for the charge pump.
Schematic
This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Dirtbox Layouts. No KiCad fragment has been drawn for this circuit yet.
Parts list 34 rows
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Check before you build · 2 values the reader of this layout was not sure of
- 20pF next to IC2: printed clearly, unusual value
- Tone pot printed 20kW (W taper), kept as W20K
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 13 | ||||
| ×4 | 1K | 1k | read from the layout by eye | |
| ×4 | 10K | 10k | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×2 | 56K | 56k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 62K | 62k | read from the layout by eye | |
| ×1 | 20K | 20k | read from the layout by eye | |
| ×1 | 7.5K | 7.5k | read from the layout by eye | |
| ×1 | 220Ω | 220 | read from the layout by eye | |
| ×1 | 560Ω | 560 | read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 10 | ||||
| ×3 | 220nF | 220n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×1 | 20pF | 20p | read from the layout by eye | |
| ×1 | 10pF | 10p | read from the layout by eye | |
| ×2 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×4 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| ×1 | 220uF | 220u | electrolytic; read from the layout by eye | |
| Diodes 4 | ||||
| D1 | 1N914 | 1N914 | read from the layout by eye | |
| D2 | 1N914 | 1N914 | read from the layout by eye | |
| D3 | 10V Zener | 10V | read from the layout by eye | |
| D4 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | 2SK30 | 2SK30 | JFET; legend: 2SK30/2SK117, 2SK246 in original; read from the layout by eye | |
| ICs 3 | ||||
| IC1 | JRC4558D | JRC4558D | read from the layout by eye | |
| IC2 | JRC4558D | JRC4558D | read from the layout by eye | |
| IC3 | MAX1044 | MAX1044 | legend: MAX1044/ICL7660S; read from the layout by eye | |
| Potentiometers 3 | ||||
| Drive | B250K | B250k | Potentiometer | dual; read from the layout by eye |
| Tone | W20K | W20k | Potentiometer | W taper; read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
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