Enclosure not stated · 4 knobs
Fuzzhead Fx Red Sun FuzzVerified
Based on the Fuzzhead Fx Red Sun Fuzz
From the post
This one started as an attempt to improve an obscure old japanese germanium fuzz circuit from the late 60s called Sekova FA II Fuzz which suffered from quite low output and lack of sustain. After some experimenting I removed the clipping diodes, tweaked the bias and added another gain stage upfront which is borrowed from Roland Bee Baa but with a germanium transistor. For transistor selection I found that these with low leakage and a hfe around 100 sounds good but it is worth experimenting with others especially for Q2 and Q3.
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 31 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×2 | 15K | 15k | read from the layout by eye | |
| ×1 | 3.9K | 3.9k | read from the layout by eye | |
| ×1 | 3.3K | 3.3k | read from the layout by eye | |
| ×3 | 68K | 68k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×2 | 8.2K | 8.2k | read from the layout by eye | |
| ×3 | 1K | 1k | read from the layout by eye | |
| ×1 | 18K | 18k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 2K | 2k | read from the layout by eye | |
| Capacitors 10 | ||||
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 220nF | 220n | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 680pF | 680p | read from the layout by eye | |
| ×2 | 470pF | 470p | read from the layout by eye | |
| ×1 | 220pF | 220p | read from the layout by eye | |
| ×2 | 33uF | 33u | electrolytic; read from the layout by eye | |
| ×4 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×3 | 100uF | 100u | electrolytic; read from the layout by eye | |
| ×2 | 1uF | 1u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| D1 | 10V Zener | 10V | read from the layout by eye | |
| D2 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 2N1307 | 2N1307 | PNP germanium, Hfe 100-120, low leakage; legend: Try 2N1307, MP20B, GT108B etc.; read from the layout by eye | |
| Q2 | 2N1307 | 2N1307 | PNP germanium, Hfe 100-120, low leakage; legend: Try 2N1307, MP20B, GT108B etc.; read from the layout by eye | |
| Q3 | 2N1307 | 2N1307 | PNP germanium, Hfe 100-120, low leakage; legend: Try 2N1307, MP20B, GT108B etc.; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | ICL7660S | ICL7660S | legend: ICL7660S / MAX1044; read from the layout by eye | |
| Potentiometers 4 | ||||
| Sustain | A100K | A100k | Potentiometer | wire labels call it Fuzz; read from the layout by eye |
| Scoop/Mid | A5K | A5k | Potentiometer | read from the layout by eye |
| Filter | B100K | B100k | Potentiometer | read from the layout by eye |
| Volume | B100K | B100k | Potentiometer | read from the layout by eye |