1590B · 3 knobs
BearFoot FX Baby Blue ODVerified
Based on the BearFoot FX Baby Blue OD
From the post
Here's Bjorn's Baby Blue overdrive. Fairly straight forward JFET circuit with hard clipping in the 2nd stage. The clipping diodes in the original are (massive) 2A1200s, but other silicon diodes will work–socket and experiment. The JFETs used in the original aren't confirmed, but I've laid it out for GSD pinout. Pots are board mounted and should fit in a 1590B. More info here.
Also, I've added extra holes on the PCB for the 470nF caps in case you want to use electrolytic capacitors.
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 28 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
- 14.7K ×2 (row L left, and vertical at column 17): printed clearly, unusual value
- D1, D2: legend prints '2A1200' clearly, unusual part number
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×4 | 470K | 470k | read from the layout by eye | |
| ×3 | 47K | 47k | read from the layout by eye | |
| ×2 | 22K | 22k | read from the layout by eye | |
| ×2 | 14.7K | 14.7k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 7.5K | 7.5k | read from the layout by eye | |
| Capacitors 9 | ||||
| ×2 | 470pF | 470p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×2 | 4.7nF | 4.7n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×1 | 1.5nF | 1.5n | read from the layout by eye | |
| ×2 | 470nF | 470n | read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| D1 | 2A1200 | 2A1200 | read from the layout by eye | |
| D2 | 2A1200 | 2A1200 | read from the layout by eye | |
| ×1 | 1N4004 | 1N4004 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; N-JFET (2N5457, J201, etc); read from the layout by eye | |
| Q2 | 2N5457 | 2N5457 | JFET; N-JFET (2N5457, J201, etc); read from the layout by eye | |
| Q3 | 2N5457 | 2N5457 | JFET; N-JFET (2N5457, J201, etc); read from the layout by eye | |
| Potentiometers 3 | ||||
| Gain | A500K | A500k | Potentiometer | read from the layout by eye |
| Treble | A50K | A50k | Potentiometer | read from the layout by eye |
| Volume | B50K | B50k | Potentiometer | read from the layout by eye |