Enclosure not stated · 5 knobs
ProCo / Fuzzdog 3-Band RatVerified
Based on the ProCo Fuzzdog 3-Band Rat
- Category
- Distortion
- Controls
- Treble · Bass · Mid · Distortion · Volume
- Build
- Vero· 19×17· 23 cuts, 9 links
- Layout
- Verified · Dirtbox Layouts marks it as built and working
- Tags
- Distortion, Fuzzdog, ProCo
From the post
This is a request. Fuzzdog tweaked a the classic Rat circuit a few years ago. It includes the "Reutz mod", a diode selector switch for assymetric silicon/LED clipping and a Marshall 3-band tonestack. The output buffer is tweaked into a gain recovery J FET stage to cover up the lossy tonestack. For a Sunn/Supergroup tonestack, just replace the 33k resistor with 56k and 470pF capacitor with 270pF.
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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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×3 | 1M | 1M | read from the layout by eye | |
| ×2 | 10K | 10k | read from the layout by eye | |
| ×2 | 1K | 1k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 1.5K | 1.5k | read from the layout by eye | |
| ×1 | 560Ω | 560 | read from the layout by eye | |
| ×1 | 47Ω | 47 | read from the layout by eye | |
| Capacitors 11 | ||||
| ×1 | 33pF | 33p | read from the layout by eye | |
| ×2 | 100pF | 100p | read from the layout by eye | |
| ×1 | 470pF | 470p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×4 | 22nF | 22n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×1 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 2.2uF | 2.2u | electrolytic; read from the layout by eye | |
| ×3 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 4 | ||||
| D1 | 1N4148 | 1N4148 | read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | read from the layout by eye | |
| D3 | 1N4148 | 1N4148 | read from the layout by eye | |
| D6 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | LM308 | LM308 | legend: LM308 / OP07; read from the layout by eye | |
| Potentiometers 5 | ||||
| Treble | A250K | A250k | Potentiometer | read from the layout by eye |
| Bass | A1M | A1M | Potentiometer | read from the layout by eye |
| Mid | A25K | A25k | Potentiometer | read from the layout by eye |
| Distortion | A100K | A100k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Trimmers 2 | ||||
| Bias | 20K | 20k | read from the layout by eye | |
| Reutz | 1K | 1k | label as printed; read from the layout by eye | |
| Switches 1 | ||||
| Switch | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |
| LEDs 2 | ||||
| D4 | 3mm red LED | 3MM RED LED | clipping, on board; read from the layout by eye | |
| D5 | 3mm red LED | 3MM RED LED | clipping, on board; read from the layout by eye | |