Enclosure not stated · 2 knobs
Kazan Booster 4 transistor versionVerified
Based on the Kazan Booster 4 transistor version
From the post
Now verified with a catch. Couldn't get it work until I replaced the diode connecting to the base of Q3 with a jumper. Also, for more volume, increase volume control to 10k-25k.
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 26 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×1 | 2.4K | 2.4k | read from the layout by eye | |
| ×1 | 12K | 12k | read from the layout by eye | |
| ×2 | 6.8K | 6.8k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 2M | 2M | read from the layout by eye | |
| ×2 | 150K | 150k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 510Ω | 510 | read from the layout by eye | |
| ×1 | 7.5K | 7.5k | read from the layout by eye | |
| Capacitors 5 | ||||
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 150nF | 150n | read from the layout by eye | |
| ×3 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×3 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| Diodes 4 | ||||
| D1 | D2D | D2D | or other ge diodes; read from the layout by eye | |
| D2 | D2D | D2D | or other ge diodes; read from the layout by eye | |
| D3 | D18 | D18 | or other ge diodes; read from the layout by eye | |
| D4 | D18 | D18 | or other ge diodes; read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | MP39B | MP39B | PNP Ge w low Hfe and leakage; read from the layout by eye | |
| Q2 | MP39B | MP39B | PNP Ge w low Hfe and leakage; read from the layout by eye | |
| Q3 | MP42B | MP42B | PNP Ge w low Hfe and leakage; read from the layout by eye | |
| Q4 | MP42B | MP42B | PNP Ge w low Hfe and leakage; read from the layout by eye | |
| Potentiometers 2 | ||||
| Timbre | B1M | B1M | Potentiometer | Try a SPST switch; read from the layout by eye |
| Level | B2.2K | B2.2k | Potentiometer | Try 10k-25k for more output; read from the layout by eye |