Enclosure not stated · 3 knobs
BJFE Baby Blue ODVerified
Based on the BJFE Baby Blue OD· 1 other board clones it
- Category
- Distortion
- Build
- Vero· 24×11· 14 cuts, 2 links
- Layout
- Verified · Tagboard Effects marks it as built and working
- Tags
- BJF/MP, Distortion, Overdrive
From the post
The BJFE Baby Blue OD is described as a dynamic pre-amp tube distortion, although it is technically more of a fuzz pedal with dynamic overdrive features. It is a killer fuzzy OD with a ton of dynamic and tonal range.
So according to the thread over at FSB there's no mention of the specific JFETs in the original other than they're N-JFET. It's possible they're either BF244 or 2N5952 both of which Bjorn is known to use. So I decided to make 2 layouts, one with a DGS pinout (BF244) and one with DSG (2N5952) so either can be made. There is also a question as to whether or not the 47k resistor going from Drain of Q1 to the power rail actually being 14.7k like the drains of Q2 and Q3, so as of now if you build this you may want to socket that resistor so you can try both and see which sounds better.
BF244 (DGS) Layout
2N5952 (DSG) Layout
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 27 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 3 values the reader of this layout was not sure of
- 14.7k x2 (column 3 top-left, column 23 top-right): printed clearly as '14.7k', an unusual value; could be the author's typo for 4.7k
- 470nF x2 (columns 3 and 9, lower half): drawn as round blue cans like the electrolytics, so polarised/tantalum is implied but not stated
- D2-D3 part number reads '2A1200' in the legend; unfamiliar number, transcribed as printed
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×1 | 1k | 1k | 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 | |
| ×1 | 10k | 10k | read from the layout by eye | |
| ×2 | 14.7k | 14.7k | read from the layout by eye | |
| ×2 | 22k | 22k | read from the layout by eye | |
| ×3 | 47k | 47k | read from the layout by eye | |
| ×4 | 470k | 470k | read from the layout by eye | |
| ×1 | 1M | 1M | 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 | |
| ×1 | 1.5nF | 1.5n | 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 | |
| ×2 | 470nF | 470n | electrolytic; read from the layout by eye | |
| ×1 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| D1 | 1n4004 | 1N4004 | read from the layout by eye | |
| D2 | 2A1200 | 2A1200 | Si diode; read from the layout by eye | |
| D3 | 2A1200 | 2A1200 | Si diode; read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | BF244 | BF244 | JFET; read from the layout by eye | |
| Q2 | BF244 | BF244 | JFET; read from the layout by eye | |
| Q3 | BF244 | BF244 | JFET; read from the layout by eye | |
| Potentiometers 3 | ||||
| Volume | A50K | A50k | Potentiometer | read from the layout by eye |
| Drive | A500K | A500k | Potentiometer | read from the layout by eye |
| Treble | A50K | A50k | Potentiometer | read from the layout by eye |
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