125B · 6 knobs
Baja ENG Overdrive
Based on the BAJA ENG Overdrive· 1 other board clones it
- Category
- Preamp / Amp-in-a-box
- Difficulty
- Difficult
- Build
- Vero· 23×25· 46 cuts, 24 links
- Layout
- Unverified · no build reported at Tagboard Effects yet
- Tags
- Amp Emulation, Baja, ENG, Engl, Overdrive
From the post
Bajaman's overdrive circuit based on the Engl 530 preamp with switchable tone stack.
Original thread and schematic available on the FSB forum here.
The layout should fit in a 125B box.
09/07/2018 Layout Updated! Inverted Treble and Bass pots' lugs. Changed 390p cap from TL062 pin 5 to 470p. Changed 1K resistor next to 22uF cap to 1K5.
22K resistor between Gain 1 and Gain 3 goes from Gain 1 to 15n/10K 3 rows below instead of Gain 3. 22K above TL062 pin 8 needs to move down one row between 10K/22K and VBias.
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 39 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 1 value the reader of this layout was not sure of
- D1 1N4148: named in the legend, not found on the populated board (possibly off-board or hidden)
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 15 | ||||
| ×3 | 560R | 560 | read from the layout by eye | |
| ×1 | 820R | 820 | read from the layout by eye | |
| ×2 | 1K | 1k | read from the layout by eye | |
| ×1 | 1K5 | 1.5k | read from the layout by eye | |
| ×1 | 2K2 | 2.2k | read from the layout by eye | |
| ×3 | 2K7 | 2.7k | read from the layout by eye | |
| ×1 | 4K7 | 4.7k | read from the layout by eye | |
| ×1 | 8K2 | 8.2k | read from the layout by eye | |
| ×7 | 10K | 10k | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×3 | 22K | 22k | read from the layout by eye | |
| ×3 | 47K | 47k | read from the layout by eye | |
| ×2 | 100K | 100k | read from the layout by eye | |
| ×5 | 1M | 1M | read from the layout by eye | |
| ×1 | 1M5 | 1.5M | read from the layout by eye | |
| Capacitors 12 | ||||
| ×1 | 120p | 120p | read from the layout by eye | |
| ×1 | 390p | 390p | read from the layout by eye | |
| ×2 | 470p | 470p | read from the layout by eye | |
| ×1 | 1n | 1n | read from the layout by eye | |
| ×1 | 3n3 | 3.3n | read from the layout by eye | |
| ×1 | 10n | 10n | read from the layout by eye | |
| ×2 | 15n | 15n | read from the layout by eye | |
| ×3 | 22n | 22n | read from the layout by eye | |
| ×8 | 1u | 1u | box film; read from the layout by eye | |
| ×1 | 22u | 22u | electrolytic; read from the layout by eye | |
| ×1 | 47u | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100u | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N4148 | 1N4148 | named in legend; not found on the board drawing; read from the layout by eye | |
| Transistors 2 | ||||
| ×2 | 2SK117 | 2SK117 | JFET; read from the layout by eye | |
| ×1 | BC547B | BC547B | read from the layout by eye | |
| ICs 2 | ||||
| ×2 | TL062 | TL062 | read from the layout by eye | |
| ×1 | TL061 | TL061 | read from the layout by eye | |
| Potentiometers 6 | ||||
| Level | B100K | B100k | Potentiometer | read from the layout by eye |
| Gain | B100K | B100k | Potentiometer | read from the layout by eye |
| Low Mid | B20K | B20k | Potentiometer | read from the layout by eye |
| High Mid | B250K | B250k | Potentiometer | read from the layout by eye |
| Bass | A1M | A1M | Potentiometer | read from the layout by eye |
| Treble | A1M | A1M | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Tone | DPDT | DPDT | toggle; read from the layout by eye | |
Other boards based on the BAJA ENG Overdrive
- BAJA ENG Overdrive Dirtbox Layouts