Enclosure not stated · 2 knobs
Baja JVM Overdrive
Based on the BAJA JVM Overdrive
- Category
- Preamp / Amp-in-a-box
- Difficulty
- Difficult
- Build
- Vero· 23×23· 37 cuts, 19 links
- Layout
- Unverified · no build reported at Tagboard Effects yet
- Tags
- Amp Emulation, Baja, JVM, Marshall, Overdrive
From the post
This is based on a Marshall JVM410.
You can find Bajaman's original thread and schematic on the FSB forum here.
There are two versions:
First one with just one toggle switch to select between Cruch, OD1 and OD2.
The second one uses separate footswitches, Gains and Levels.
You need to add an extra pole for LEDs.
Can use any small signal N channel JFet for the buffers (mind the pinout).
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 34 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 2 values the reader of this layout was not sure of
- 2K7 right of the TL064 near the top (column 18, below the right-hand 2SK117): could be 2K2, small turned text
- 8n2 ceramic right of the TL064: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 13 | ||||
| ×1 | 100R | 100 | read from the layout by eye | |
| ×6 | 1K | 1k | read from the layout by eye | |
| ×2 | 1K2 | 1.2k | read from the layout by eye | |
| ×2 | 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 | |
| ×6 | 10K | 10k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×1 | 1M5 | 1.5M | read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 12 | ||||
| ×1 | 180p | 180p | read from the layout by eye | |
| ×1 | 560p | 560p | read from the layout by eye | |
| ×1 | 1n | 1n | read from the layout by eye | |
| ×2 | 4n7 | 4.7n | read from the layout by eye | |
| ×1 | 8n2 | 8.2n | read from the layout by eye | |
| ×2 | 10n | 10n | read from the layout by eye | |
| ×1 | 12n | 12n | read from the layout by eye | |
| ×1 | 22n | 22n | read from the layout by eye | |
| ×1 | 47n | 47n | read from the layout by eye | |
| ×1 | 100n | 100n | read from the layout by eye | |
| ×9 | 1u | 1u | read from the layout by eye | |
| ×2 | 100u | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | 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 1 | ||||
| ×1 | TL064 | TL064 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Drive | B100K | B100k | Potentiometer | read from the layout by eye |
| Level | A100K | A100k | Potentiometer | read from the layout by eye |
| Switches 2 | ||||
| Switch 1 | 3PDT on/off/on | 3PDT ON/OFF/ON | toggle, Crunch/ODs; read from the layout by eye | |
| Switch 2 | SPST | SPST | orange/Red; read from the layout by eye | |