Enclosure not stated · 2 knobs
Schaller Fuzz SustainVerified
Based on the Schaller Fuzz Sustain
From the post
An old fuzztone from West Germany which was housed in a wah shell. The treadle controlled the amount of fuzz and clean signal through a dual gang pot. There was an internal 22k trimmer which controlled the amount of gain.
Built it stock which works fine but it needed some improvements like higher output level and the internal trimpot was changed to an external gain control. Increased the value to 100k for more gain. Stock units had BC413C and BC239C transistors which is fairly high gain general purpose silicon transistors so BC549C's and 2N5088's should work equally good.
Schematic.
Stock circuit
Modified circuit
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 28 rows
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Check before you build · 1 value the reader of this layout was not sure of
- D1-D2 printed 'BA07' in the legend: probably a typo, the factory schematic in picture 1 reads BA 127; entered as printed
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×5 | 10K | 10k | one drawn socketed; read from the layout by eye | |
| ×2 | 56K | 56k | read from the layout by eye | |
| ×2 | 1K | 1k | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×2 | 27K | 27k | read from the layout by eye | |
| ×2 | 100K | 100k | read from the layout by eye | |
| ×2 | 220K | 220k | read from the layout by eye | |
| ×1 | 68K | 68k | drawn socketed; read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 470Ω | 470 | read from the layout by eye | |
| Capacitors 7 | ||||
| ×6 | 2.2uF | 2.2u | electrolytic; read from the layout by eye | |
| ×4 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×2 | 100pF | 100p | read from the layout by eye | |
| ×1 | 470pF | 470p | read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | BA07 | BA07 | D1, D2; Try 1N4001; read from the layout by eye | |
| D3 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 5 | ||||
| Q1 | BC413C | BC413C | read from the layout by eye | |
| Q2 | BC413C | BC413C | read from the layout by eye | |
| Q3 | BC239C | BC239C | read from the layout by eye | |
| Q4 | BC239C | BC239C | read from the layout by eye | |
| Q5 | BC239C | BC239C | read from the layout by eye | |
| Potentiometers 2 | ||||
| Blend | B100K | B100k | Potentiometer | dual; read from the layout by eye |
| Intensity | B250K | B250k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×1 | 22K | 22k | read from the layout by eye | |