Enclosure not stated · 3 knobs
Mad Professor Blueberry Bass OverdriveVerified
Based on the Mad Professor Blueberry Bass Overdrive· 4 other boards clone it
From the post
This is basically a higher gain version of BJFE Blueberry Bass OD since it has an added pre amp stage (Q1). Note that originals had the now obsolete BF244A transistors with DGS pinouts. I changed the pinouts for more accesible transistors. 2N5457s should bias up fine and sound good.
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 36 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 5 values the reader of this layout was not sure of
- 2K standing resistor between D1 and D2 (column 12, rows K-M): reads 2K, but the label sits low in the body between the two LEDs, so a leading character could be hidden
- 14.7K ×3 (columns 2, 7 and 3): printed clearly, unusual value
- 147K (column 7, rows N-Q): printed clearly, unusual value
- 2.6K (column 15): printed clearly, unusual value
- 30K (column 4) and 360K (lying on row G): printed clearly, unusual values
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 16 | ||||
| ×3 | 14.7K | 14.7k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×2 | 10K | 10k | read from the layout by eye | |
| ×2 | 10M | 10M | read from the layout by eye | |
| ×2 | 47K | 47k | read from the layout by eye | |
| ×2 | 1K | 1k | read from the layout by eye | |
| ×1 | 30K | 30k | read from the layout by eye | |
| ×1 | 5.6K | 5.6k | read from the layout by eye | |
| ×1 | 2.6K | 2.6k | read from the layout by eye | |
| ×1 | 1.5K | 1.5k | read from the layout by eye | |
| ×1 | 360K | 360k | read from the layout by eye | |
| ×1 | 147K | 147k | read from the layout by eye | |
| ×1 | 27K | 27k | read from the layout by eye | |
| ×1 | 2K | 2k | read from the layout by eye | |
| ×1 | 47Ω | 47 | read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 12 | ||||
| ×1 | 47pF | 47p | read from the layout by eye | |
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×1 | 470pF | 470p | read from the layout by eye | |
| ×1 | 4.7nF | 4.7n | read from the layout by eye | |
| ×2 | 22nF | 22n | read from the layout by eye | |
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×2 | 220nF | 220n | read from the layout by eye | |
| ×2 | 1uF | 1u | electrolytic; 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 | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×3 | 1N4007 | 1N4007 | D3, D4, D5; read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; BF244A in original; read from the layout by eye | |
| Q2 | 2N5457 | 2N5457 | JFET; BF244A in original; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | CA3130EZ | CA3130EZ | read from the layout by eye | |
| Potentiometers 3 | ||||
| Drive | A1M | A1M | Potentiometer | read from the layout by eye |
| Nature | A50K | A50k | Potentiometer | read from the layout by eye |
| Volume | B50K | B50k | Potentiometer | read from the layout by eye |
| LEDs 1 | ||||
| ×2 | 3mm green LED | 3MM GREEN LED | D1, D2; read from the layout by eye | |
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