Enclosure not stated · 2 knobs
Schaller Fuzz '72Verified
Based on the Schaller Fuzz '72
From the post
Argh. I just hate it when i draw a layout and when i'm posting it, i can't find anything but just a few photos of the original unit - No ad texts, no original ads no nothing. Just a few images from google image search and one youtube clip from different design by the same manufacturer. So i have to go it alone.
Schematic and circuit blueprint does not differ that much from Fuzz Face, so it's safe to assume that this was german made FF-clone of the seventies. Some values are slightly different, but, it basically sounds just like any other silicon Fuzz Face. Built it myself, and i like it. Not a bad thing to have. Use as low hFE transistors you can get. 2N2369 and 2N3903 are good candidates... Built mine with 2n2222 TO-18 metal cans, and.. You guessed it.. It's not that far from my 2N2222 Si Fuzz Face clone - or from my Vox Tonebender '66 clone. So it's not super pretty, but interesting FF adaptation anyway.
If your Q2 bias needs some tweaking, that 3K3 resistor is good place to start. Replacing that with 10K trimmer wouldn't be too back of an idea. One could move that electrolytic connected to 3K3 three columns left and place trimmer as simple variable resistor between rows four and six. Did that to my board, and it's at its sweetest around 4K7-5K.
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 16 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 470Ω at column G, top: the last character overlaps the resistor's colour bands; read as 470Ω (bands yellow-violet-black-black agree)
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 6 | ||||
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×1 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 3.3K | 3.3k | read from the layout by eye | |
| Capacitors 5 | ||||
| ×1 | 1nF | 1n | ceramic; read from the layout by eye | |
| ×1 | 47pF | 47p | ceramic; read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 25uF | 25u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | optional, polarity protection; legend: use 1N4001 or 1N5817; read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | BC239B | BC239B | BC239B or BC109B; read from the layout by eye | |
| Q2 | BC239B | BC239B | BC239B or BC109B; read from the layout by eye | |
| Potentiometers 2 | ||||
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Fuzz | B1K | B1k | Potentiometer | read from the layout by eye |