Enclosure not stated · 3 knobs
Keeley Fuzz HeadVerified
Based on the Keeley Fuzz Head· 2 other boards clone it
From the post
I haven't seen any layouts of this one around so thought it would be good to add to the collection. I have done this with a 3 position switch so in one position you'll have silicon diodes, in the other postion you'll have germanium, and in the centre off position it will remove all clipping diodes from the circuit.
With external pregain pot to bias the AC127:
With pregain trimmer on board:
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 31 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×1 | 22R | 22 | read from the layout by eye | |
| ×1 | 100R | 100 | read from the layout by eye | |
| ×2 | 220R | 220 | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 3K3 | 3.3k | read from the layout by eye | |
| ×5 | 10K | 10k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×2 | 100K | 100k | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×1 | 620K | 620k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 7 | ||||
| ×1 | 120p | 120p | read from the layout by eye | |
| ×1 | 1n | 1n | read from the layout by eye | |
| ×1 | 27n | 27n | read from the layout by eye | |
| ×3 | 220n | 220n | read from the layout by eye | |
| ×2 | 10u | 10u | electrolytic; read from the layout by eye | |
| ×2 | 47u | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100u | 100u | electrolytic; read from the layout by eye | |
| Diodes 4 | ||||
| D1 | 1N4148 | 1N4148 | on the switch; read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | on the switch; read from the layout by eye | |
| D3 | 1N34A | 1N34A | on the switch; read from the layout by eye | |
| D4 | 1N34A | 1N34A | on the switch; read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | AC127 | AC127 | germanium; read from the layout by eye | |
| Q2 | MPSA18 | MPSA18 | read from the layout by eye | |
| Q3 | MPSA18 | MPSA18 | read from the layout by eye | |
| Q4 | MPSA18 | MPSA18 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Gain | B2K | B2k | Potentiometer | read from the layout by eye |
| PreGain | B10K | B10k | Potentiometer | read from the layout by eye |
| Volume | B50K | B50k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Clipping | DPDT on/off/on | DPDT ON/OFF/ON | 3 position toggle, selects D1/D2 or D3/D4; read from the layout by eye | |
Other boards based on the Keeley Fuzz Head
- Keeley Fuzz Head Dirtbox Layouts
- Keeley Fuzz Head Effects Layouts (blog)