125B · 6 knobs
Catalinbread Dirty Little Secret Mk. III (ish)Verified
Based on the Catalinbread Dirty Little Secret Mk. III· 4 other boards clone it
- Category
- Preamp / Amp-in-a-box
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Amp Emulator, Catalinbread, Overdrive
From the post
I've gotten a few requests for the Mk. III and found several good stock layouts on FSB, so I thought I'd go with a slightly modified version of the DLS Mk. III. This has an added presence control, as well as an onboard charge pump. It's designed for use in a 125B with top mounted jacks, and the pots are all board mounted. Here's the schematic the layout is based on for reference.
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 35 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×5 | 1M | 1M | read from the layout by eye | |
| ×3 | 470K | 470k | read from the layout by eye | |
| ×3 | 1K | 1k | read from the layout by eye | |
| ×2 | 2.2M | 2.2M | read from the layout by eye | |
| ×2 | 33K | 33k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 820Ω | 820 | read from the layout by eye | |
| ×1 | 560Ω | 560 | read from the layout by eye | |
| Capacitors 11 | ||||
| ×2 | 680nF | 680n | read from the layout by eye | |
| ×2 | 220nF | 220n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×4 | 22nF | 22n | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×4 | 470pF | 470p | read from the layout by eye | |
| ×1 | 220pF | 220p | read from the layout by eye | |
| ×1 | 47pF | 47p | read from the layout by eye | |
| ×2 | 2.2uF | 2.2u | electrolytic; read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | 1N5817 | 1N5817 | read from the layout by eye | |
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 5 | ||||
| Q1 | MPF4393 | MPF4393 | JFET; MPF4393 or similar JFET; read from the layout by eye | |
| Q2 | MPF4393 | MPF4393 | JFET; MPF4393 or similar JFET; read from the layout by eye | |
| Q3 | MPF4393 | MPF4393 | JFET; MPF4393 or similar JFET; read from the layout by eye | |
| Q4 | MPF4393 | MPF4393 | JFET; MPF4393 or similar JFET; read from the layout by eye | |
| Q5 | MPF4393 | MPF4393 | JFET; MPF4393 or similar JFET; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | MAX1044 | MAX1044 | read from the layout by eye | |
| Potentiometers 6 | ||||
| Gain | A1M | A1M | Potentiometer | read from the layout by eye |
| Treble | B250K | B250k | Potentiometer | read from the layout by eye |
| Bass | A1M | A1M | Potentiometer | read from the layout by eye |
| Mids | B25K | B25k | Potentiometer | read from the layout by eye |
| Presence | B10K | B10k | Potentiometer | read from the layout by eye |
| Volume | B250K | B250k | Potentiometer | read from the layout by eye |
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