Enclosure not stated · 3 knobs
Run Off Groove EighteenVerified
Based on the Run Off Groove Eighteen· 3 other boards clone it
- Category
- Preamp / Amp-in-a-box
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Amp Emulator, Overdrive, Run Off Groove
From the post
The ROG Eighteen is an overdrive/distortion circuit based on the classic 18watt Marshall amp of the late 60s. It uses JFETs in place of tubes, like many other ROG amp-based drive effects. J201s are specified, but socket and try some other JFETs (2N5457, MPF102, etc.) The Volume control will probably act more like a gain control, though there is no resistor limiting the minimum amount of signal sent to ground when it's at zero. For the schematic and more info on the circuit see the ROG article.
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 7 | ||||
| ×1 | 120Ω | 120 | read from the layout by eye | |
| ×2 | 820Ω | 820 | read from the layout by eye | |
| ×2 | 8.2K | 8.2k | read from the layout by eye | |
| ×2 | 15K | 15k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 7 | ||||
| ×1 | 220pF | 220p | read from the layout by eye | |
| ×2 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 4.7nF | 4.7n | read from the layout by eye | |
| ×3 | 10nF | 10n | read from the layout by eye | |
| ×1 | 15nF | 15n | read from the layout by eye | |
| ×2 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | J201 | J201 | JFET; legend: J201 or similar; read from the layout by eye | |
| Q2 | J201 | J201 | JFET; legend: J201 or similar; read from the layout by eye | |
| Q3 | J201 | J201 | JFET; legend: J201 or similar; read from the layout by eye | |
| Potentiometers 3 | ||||
| Tone | A500K | A500k | Potentiometer | read from the layout by eye |
| Volume | A500K | A500k | Potentiometer | read from the layout by eye |
| Master | A100K | A100k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×3 | 100K | 100k | drain bias trimmers; read from the layout by eye | |
Other boards based on the Run Off Groove Eighteen
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