Enclosure not stated · 2 knobs
Sekova FA-II FuzzVerified
Based on the Sekova FA-II Fuzz· 1 other board clones it
From the post
Check out Tonemachines blog post for this 1969 japanese beauty.
Apparently, this is exactly the same circuit that can be found inside Apollo Fuzz and Crestwood Fuzz boxes...
The circuit uses "positive ground" with PNP Ge transistors. Mind the power supply or use a charge pump.
Now verified. Different transistor models/individuals will affect the output level, so it's recommended to use sockets to find out the perfect set. Or you could tweak the board and replace collector resistors with trimmers.
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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 18 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×1 | 1M | 1M | read from the layout by eye | |
| ×2 | 15K | 15k | read from the layout by eye | |
| ×2 | 27K | 27k | read from the layout by eye | |
| ×4 | 5.6K | 5.6k | read from the layout by eye | |
| ×2 | 22K | 22k | read from the layout by eye | |
| ×1 | 68K | 68k | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| Capacitors 5 | ||||
| ×5 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×2 | 33uF | 33u | electrolytic; read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 220nF | 220n | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| Diodes 2 | ||||
| D1 | 1N270 | 1N270 | Ge (try 1N270 or 1N34A); read from the layout by eye | |
| D2 | 1N270 | 1N270 | Ge (try 1N270 or 1N34A); read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | 2SB173 | 2SB173 | try any PNP Ge; read from the layout by eye | |
| Q2 | 2SB173 | 2SB173 | try any PNP Ge; read from the layout by eye | |
| Potentiometers 2 | ||||
| Attack | B500K | B500k | Potentiometer | read from the layout by eye |
| Volume | B50K | B50k | Potentiometer | read from the layout by eye |
Other boards based on the Sekova FA-II Fuzz
- Sekova FA-II Fuzz Dirtbox Layouts