Enclosure not stated · 1 knob
Spektr 1 Fuzz Wah sans LFO
Based on the Spektr 1 Fuzz Wah sans LFO
From the post
Lot's of love for old soviet circuits here lately, find it very interesting since sometimes the designers started from scratch with no input from the oustide world resulting in some quite unique designs.
Here is a gnarly beast, Spektr -1 fuzz Wah. I omitted the LFO section connecting to Wah circuit since it needs a seaparate battery. It calls for quite a few PNP Germaniums which is still cheap and widely avaiable. Still not sure about the D814 zener diodes. Voltage rating varies between 7v and 11v depending on its suffix which isn't marked on the schematic.
I also moved two of the internal trimpots which controls volume output to panel mounted pots.
Currently unverified.
Fuzz section
Wah section
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 25 rows
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Check before you build · 2 values the reader of this layout was not sure of
- 3K at column 14 rows H-J: printed clearly, unusual value
- 62K, 51K, 6.2K, 820K: printed clearly, unusual values
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 14 | ||||
| ×1 | 62K | 62k | read from the layout by eye | |
| ×2 | 3.9K | 3.9k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×2 | 820Ω | 820 | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 51K | 51k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 20K | 20k | read from the layout by eye | |
| ×1 | 820K | 820k | read from the layout by eye | |
| ×2 | 6.2K | 6.2k | read from the layout by eye | |
| ×4 | 33K | 33k | read from the layout by eye | |
| ×1 | 3K | 3k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| Capacitors 5 | ||||
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| ×3 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×2 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×1 | 1.5nF | 1.5n | read from the layout by eye | |
| Diodes 2 | ||||
| ×4 | D814 | D814 | D1-D4, 7-11v zener; read from the layout by eye | |
| D5 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| ×6 | PNP Germanium | PNP GERMANIUM | Q1-Q6, Hfe 60-100, low leakage; P416B and MP25B in original; read from the layout by eye | |
| Potentiometers 1 | ||||
| Volume | B20K | B20k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×1 | 20K | 20k | read from the layout by eye | |
| Switches 1 | ||||
| Switch | SPDT on/on | SPDT ON/ON | read from the layout by eye | |