Enclosure not stated · 3 knobs
KMA Fuzzly BearVerified
Based on the KMA Machines Fuzzly Bear· 5 other boards clone it
From the post
For Fuzz Friday, here's an interesting take on the Bosstone fuzz with a few value changes, extra diodes, and a voltage sag control. Schematic and discussion here. I did add a bit of a mod to this–the resistor marked "0-10k" limits the minimum setting of the drive pot. Stock, lug 1 goes directly to ground. But IMO, it's a bit better to have that limiter there, otherwise it's just another way to mute the pedal. So adjust that to taste.
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 18 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 0-10K resistor at column 6, rows B-E: printed clearly as a range '0-10K' (builder's choice), not a single value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×1 | 150K | 150k | read from the layout by eye | |
| ×1 | 0-10K | 0-10k | printed as a range; read from the layout by eye | |
| ×2 | 560K | 560k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 18K | 18k | read from the layout by eye | |
| Capacitors 6 | ||||
| ×1 | 330nF | 330n | read from the layout by eye | |
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 68nF | 68n | read from the layout by eye | |
| ×1 | 47pF | 47p | read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| ×4 | 1N4148 | 1N4148 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | BC109C | BC109C | read from the layout by eye | |
| Q2 | 2N3906 | 2N3906 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Gain | B500K | B500k | Potentiometer | read from the layout by eye |
| Sag | B50K | B50k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
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