1590A · 2 knobs
Shin Ei FY-2 Companion FuzzVerified
Based on the Shin-ei FY-2 Companion Fuzz· 10 other boards clone it
From the post
The epitome of buzzsaw fuzz tones, the Shin Ei Companion Fuzz has become a highly sought after fuzz box. The one drawback to the FY-2 is the tone stack between the Fuzz and Volume controls. Besides not being controllable, it drops the volume of the effect below unity. I've drawn up a stock layout, as well as a modded version with a booster at the output to up the volume to a more reasonable level (based on the schematic from General Guitar Gadgets). The stock layout will fit in a 1590A, and the boosted version could as well, it would just be a tighter fit.
A useful mod to the stock layout could be adding a tone bypass switch. Use a DPDT (on/on) and wire it like this:
When the tone stack is bypassed, the volume should increase significantly.
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 19 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 8 | ||||
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 1.5M | 1.5M | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 1.2M | 1.2M | read from the layout by eye | |
| Capacitors 6 | ||||
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×2 | 1nF | 1n | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 3.3nF | 3.3n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | NPN silicon | NPN SILICON | legend: Q1-2: NPN silicon; read from the layout by eye | |
| Q2 | NPN silicon | NPN SILICON | legend: Q1-2: NPN silicon; read from the layout by eye | |
| Potentiometers 2 | ||||
| Fuzz | B50K | B50k | Potentiometer | read from the layout by eye |
| Volume | B50K | B50k | Potentiometer | read from the layout by eye |
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