1590B · 3 knobs
Cornish G-2Verified
Based on the Cornish G-2· 5 other boards clone it
From the post
Happy Fuzz Friday, everyone! As promised, here's my layout for the Pete Cornish G-2. The circuit is essentially a Big Muff (with a few different component values) with a simplified tone stack and input buffers. It's not quite as fuzzy or distorted as a typical BMP but more of a heavy overdrive. Though it can get fuzzy at higher Sustain levels. There is a bit of uncertainty over the type of diodes used in the clipping stages, so socketing is a good idea here. 1N34s or 1N60s are a good place to start.
As I mentioned earlier this week, I've also laid out the bypass buffer with a board mounted footswitch. It's a little too wide for a 1590B, but this and main circuit layout will fit very nicely in a 125B enclosure.
If you're building on perf and want to include the bypass buffer of the original you can use the Cornish Buffer layout and wire it like this:
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 37 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 16 | ||||
| ×2 | 100Ω | 100 | read from the layout by eye | |
| ×1 | 120Ω | 120 | read from the layout by eye | |
| ×1 | 620Ω | 620 | read from the layout by eye | |
| ×2 | 680Ω | 680 | read from the layout by eye | |
| ×2 | 1K | 1k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×4 | 8.2K | 8.2k | read from the layout by eye | |
| ×3 | 15K | 15k | read from the layout by eye | |
| ×2 | 39K | 39k | read from the layout by eye | |
| ×1 | 68K | 68k | read from the layout by eye | |
| ×5 | 100K | 100k | read from the layout by eye | |
| ×1 | 120K | 120k | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| ×1 | 390K | 390k | read from the layout by eye | |
| ×3 | 470K | 470k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 8 | ||||
| ×3 | 1nF | 1n | read from the layout by eye | |
| ×2 | 10nF | 10n | read from the layout by eye | |
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×4 | 220nF | 220n | read from the layout by eye | |
| ×3 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×2 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| ×1 | 220uF | 220u | electrolytic; read from the layout by eye | |
| Diodes 5 | ||||
| D1 | ? | ? | value not given; read from the layout by eye | |
| D2 | ? | ? | value not given; read from the layout by eye | |
| D3 | ? | ? | value not given; read from the layout by eye | |
| D4 | ? | ? | value not given; read from the layout by eye | |
| ×1 | 1N5401 | 1N5401 | printed 5401; read from the layout by eye | |
| Transistors 5 | ||||
| Q1 | BC549 | BC549 | read from the layout by eye | |
| Q2 | BC549 | BC549 | read from the layout by eye | |
| Q3 | BC549 | BC549 | read from the layout by eye | |
| Q4 | BC549 | BC549 | read from the layout by eye | |
| Q5 | BC549 | BC549 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Sustain | A50K | A50k | Potentiometer | read from the layout by eye |
| Tone | B25K | B25k | Potentiometer | read from the layout by eye |
| Volume | A10K | A10k | Potentiometer | read from the layout by eye |
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- Cornish G-2 Dirtbox Layouts
- Cornish G-2 (2012 battery free version) Dirtbox Layouts
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