Enclosure not stated · 4 knobs
Borisov Formanta FuzzVerified
Based on the Borisov Formanta Fuzz
From the post
A really good sounding fuzz found in old soviet Borisov Formanta guitars. Added a pre gain control in front and a cap blend for the body control in the tonestack. I also tweaked collector resistor of connecting Q2 to 8,2k. Sounds loud, gnarly and heavy.
Original has KT315B transistors but 2N2222A, 2N3904 and BC107 works really good in there too, just mind the pinout.
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 Dirtbox Layouts. No KiCad fragment has been drawn for this circuit yet.
Parts list 24 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×1 | 150K | 150k | read from the layout by eye | |
| ×1 | 5.6K | 5.6k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 8.2K | 8.2k | read from the layout by eye | |
| ×1 | 39K | 39k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| Capacitors 8 | ||||
| ×1 | 470pF | 470p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 15nF | 15n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 33uF | 33u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | KT315B | KT315B | Try 2N2222A, BC107A etc.; read from the layout by eye | |
| Q2 | KT315B | KT315B | Try 2N2222A, BC107A etc.; read from the layout by eye | |
| Potentiometers 4 | ||||
| Tone | B50K | B50k | Potentiometer | read from the layout by eye |
| Fuzz | B100K | B100k | Potentiometer | read from the layout by eye |
| Body | B100K | B100k | Potentiometer | read from the layout by eye |
| Volume | B100K | B100k | Potentiometer | read from the layout by eye |