125B · 3 knobs
Spaceman Effects Gemini III Dual Fuzz GeneratorVerified
Based on the Spaceman Effects Gemini III· 2 other boards clone it
From the post
This week's Fuzz Friday layout happens to be the 500th layout on the blog! So for #500 it has to be something cool, so here's a really unique fuzz from Spaceman Effects–the Gemini III Dual Fuzz Generator. As the name implies, it has 2 sides: silicon and germanium. The Blend knob pans between the 2, and each side has a 3-way gain switch. I've laid it out for board mounted pots for a 125B with top mounted jacks.
It's a good idea to experiment with the transistors, especially on the germanium side. Here's some good alternatives from digi2t who traced it over on DIYSB:
Q1: Russian MP20B (hFE: 80-85)
Q2: Russian GT404 (hFE: 120-130)
Q3: Russian GT402 (hFE: 100-115)
Q5: BC109B or 2N3700 (hFE: mid 200s)
Q7: 2N5088
Also the 1nF cap near the input apparently really needs to be a polystyrene. YMMV
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 47 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 3 values the reader of this layout was not sure of
- 308K at column 9, rows E-H: printed clearly, unusual value (the same in the wiring diagram)
- 18.5K on the Germanium Gain switch: printed clearly, unusual value
- 1uF at the right of the board is drawn as a rounded box, not a can: taken as a film capacitor
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 16 | ||||
| ×1 | 47.5Ω | 47.5 | on the Silicon Gain switch; read from the layout by eye | |
| ×2 | 1K | 1k | one on the board, one on the Germanium Gain switch; read from the layout by eye | |
| ×3 | 2.1K | 2.1k | read from the layout by eye | |
| ×1 | 3K | 3k | on the Silicon Gain switch; read from the layout by eye | |
| ×1 | 3.65K | 3.65k | read from the layout by eye | |
| ×4 | 10K | 10k | read from the layout by eye | |
| ×1 | 15K | 15k | on the Germanium Gain switch; read from the layout by eye | |
| ×1 | 18.5K | 18.5k | on the Germanium Gain switch; read from the layout by eye | |
| ×3 | 21.5K | 21.5k | read from the layout by eye | |
| ×2 | 36.5K | 36.5k | read from the layout by eye | |
| ×2 | 100K | 100k | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×1 | 308K | 308k | read from the layout by eye | |
| ×1 | 430K | 430k | read from the layout by eye | |
| ×2 | 4.7M | 4.7M | read from the layout by eye | |
| Capacitors 12 | ||||
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 1.2nF | 1.2n | read from the layout by eye | |
| ×1 | 1.8nF | 1.8n | read from the layout by eye | |
| ×2 | 5.6nF | 5.6n | read from the layout by eye | |
| ×2 | 68nF | 68n | read from the layout by eye | |
| ×4 | 100nF | 100n | read from the layout by eye | |
| ×1 | 120nF | 120n | read from the layout by eye | |
| ×2 | 220nF | 220n | read from the layout by eye | |
| ×1 | 680nF | 680n | read from the layout by eye | |
| ×1 | 1uF | 1u | read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| D1 | ? | ? | value not given; read from the layout by eye | |
| D2 | ? | ? | value not given; read from the layout by eye | |
| ×1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 7 | ||||
| Q1 | AC128 | AC128 | germanium; read from the layout by eye | |
| Q2 | AC128 | AC128 | germanium; read from the layout by eye | |
| Q3 | AC176 | AC176 | germanium; read from the layout by eye | |
| Q4 | 2N2222A | 2N2222A | read from the layout by eye | |
| Q5 | 2N2222A | 2N2222A | read from the layout by eye | |
| Q6 | 2N2222A | 2N2222A | read from the layout by eye | |
| Q7 | 2N2222A | 2N2222A | read from the layout by eye | |
| Transformers 1 | ||||
| ×1 | Xicon 42TL019-RC | XICON 42TL019-RC | read from the layout by eye | |
| Potentiometers 3 | ||||
| Filter | B50K | B50k | Potentiometer | dual; read from the layout by eye |
| Blend | B50K | B50k | Potentiometer | legend spells it 'Belnd'; read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Trimmers 2 | ||||
| ×1 | 25K | 25k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| Switches 3 | ||||
| Germanium Gain | DPDT on/off/on | DPDT ON/OFF/ON | toggle, resistors on the lugs; read from the layout by eye | |
| Silicon Gain | DPDT on/off/on | DPDT ON/OFF/ON | toggle, resistors on the lugs; read from the layout by eye | |
| Tone Mode | DPDT on/on | DPDT ON/ON | toggle; read from the layout by eye | |
Other boards based on the Spaceman Effects Gemini III
- Fuzzimile Dead End FX · 1590BBS · $15.00
- Spaceman Effects Gemini III Dirtbox Layouts