Enclosure not stated · 3 knobs
Exar OD-2Verified
Based on the Exar OD-2
From the post
Here's a fairly unique OD from the mid-nineties and the Polish pedal manufacture Exar Electronix. It's a soft clipping drive based around a simple discrete opamp topography. Originals have J113 JFETs, but others should work just fine. More info on FSB.
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 Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 22 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 6 | ||||
| ×7 | 10K | 10k | read from the layout by eye | |
| ×2 | 2.2K | 2.2k | read from the layout by eye | |
| ×2 | 1K | 1k | read from the layout by eye | |
| ×2 | 4.7K | 4.7k | read from the layout by eye | |
| ×2 | 100K | 100k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| Capacitors 6 | ||||
| ×1 | 220nF | 220n | read from the layout by eye | |
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×3 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×1 | 1N5817 | 1N5817 | read from the layout by eye | |
| ×3 | 1N4148 | 1N4148 | read from the layout by eye | |
| Transistors 5 | ||||
| Q1 | J113 | J113 | JFET; read from the layout by eye | |
| Q2 | J113 | J113 | JFET; read from the layout by eye | |
| Q3 | J113 | J113 | JFET; read from the layout by eye | |
| Q4 | BC560 | BC560 | read from the layout by eye | |
| Q5 | BC549 | BC549 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Tone | A20K | A20k | Potentiometer | read from the layout by eye |
| Drive | A1M | A1M | Potentiometer | wire labels on the board read Volume; read from the layout by eye |
| Level | A20K | A20k | Potentiometer | wire labels on the board read Volume; read from the layout by eye |