Enclosure not stated · 2 knobs
Knight KG389 Fuzz BoxVerified
Based on the Knight KG389 Fuzz Box
From the post
Originally sold as a kit, this seems like a nice adaptation of Sam Ash/Astrotone fuzz. Not sure about the original transistors, but my best bet would be on the 2N2222 and other relatively low gain devices. Original also has 50n caps, but i think most of you have stock of 47n caps...
Andrea notes on the comments that the transistors in original ktis are likely to be the ceramic BC108C with golden leads. Updated the layouts transistor notes accordingly.
Update: The transistors in original unit are in fact 2N3391As, as clarified by the awesome Tonemachines blog. And by looking at the datasheet, those are rated at 250-500 hFE, so 2N2222s should be just fine - unless, of course, you can find a batch of 2N3391s somewhere...
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 11 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 3 | ||||
| ×1 | 470K | 470k | read from the layout by eye | |
| ×2 | 100K | 100k | read from the layout by eye | |
| ×2 | 2.2M | 2.2M | read from the layout by eye | |
| Capacitors 2 | ||||
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×1 | 1.5nF | 1.5n | read from the layout by eye | |
| Diodes 3 | ||||
| D1 | 1N4148 | 1N4148 | legend: Si (try 1N4148 similar); read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | legend: Si (try 1N4148 similar); read from the layout by eye | |
| D3 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| ×2 | BC108C | BC108C | read from the layout by eye | |
| Potentiometers 2 | ||||
| Fuzz Tone | B100K | B100k | Potentiometer | read from the layout by eye |
| Volume | B100K | B100k | Potentiometer | read from the layout by eye |