Enclosure not stated · 2 knobs
DOD Overdrive Preamp 250 ReissueVerified
Based on the DOD 250 Overdrive Preamp· 11 other boards clone it
From the post
Got an early 90s unit recently, the chinese reissue with JRC4558 chip. I'm still really surprised how good it sounds. So i do think this is very neglected and underrated pedal. I've added polarity protection diode and pulldown resistor for the input. The chip is stated as KA4558 in the italian reissue schematic i found (and some random gutshots from the web confirm that), but you could try any dual opamp in there. Now you can build your own with true bypass, indicator LED and standard power jack!
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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 18 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 25pF ceramic left of IC1: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×2 | 1M | 1M | read from the layout by eye | |
| ×2 | 22K | 22k | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| Capacitors 6 | ||||
| ×1 | 56nF | 56n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 25pF | 25p | read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | 1N4148 | 1N4148 | D1, D2; read from the layout by eye | |
| D3 | 1N5817 | 1N5817 | added polarity protection, use 1N5817 or 1N4001; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | KA4558 | KA4558 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Gain | C500K | C500k | Potentiometer | rev. log; read from the layout by eye |
| Level | B100K | B100k | Potentiometer | read from the layout by eye |
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