Enclosure not stated · 4 knobs
Throbak Overdrive Boost
Based on the Throbak Overdrive Boost· 2 other boards clone it
From the post
Per request. A modified Colorsound Overdriver circuit with some bells and whistles. The most noticable one is the Ge switch which toggles in a germanium diode and a germanium transistor for hard clipping. Schematic is avaiable HERE.
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 30 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×2 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| ×2 | 470Ω | 470 | read from the layout by eye | |
| ×2 | 150K | 150k | read from the layout by eye | |
| ×2 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 120K | 120k | read from the layout by eye | |
| ×1 | 12K | 12k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 3.9K | 3.9k | read from the layout by eye | |
| ×1 | 5.6K | 5.6k | read from the layout by eye | |
| Capacitors 6 | ||||
| ×1 | 200pF | 200p | read from the layout by eye | |
| ×2 | 10nF | 10n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×2 | 220nF | 220n | read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×5 | 22uF | 22u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| D1 | Germanium | GERMANIUM | type not specified; read from the layout by eye | |
| D2 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | 2N2222A | 2N2222A | read from the layout by eye | |
| Q2 | 2N2222A | 2N2222A | read from the layout by eye | |
| Q3 | 2N2222A | 2N2222A | read from the layout by eye | |
| Q4 | 2N404 | 2N404 | legend: 2N404 or other PNP Germanium; read from the layout by eye | |
| Potentiometers 4 | ||||
| Gain | C10K | C10k | Potentiometer | read from the layout by eye |
| Treble | B100K | B100k | Potentiometer | read from the layout by eye |
| Bass | B100K | B100k | Potentiometer | read from the layout by eye |
| Master | A100K | A100k | Potentiometer | read from the layout by eye |
| Trimmers 2 | ||||
| ×3 | 10K | 10k | read from the layout by eye | |
| ×1 | 500K | 500k | read from the layout by eye | |
| Switches 2 | ||||
| Ge Sw | SPST | SPST | read from the layout by eye | |
| Pre Gain Sw | DPDT | DPDT | footswitch; read from the layout by eye | |
Other boards based on the Throbak Overdrive Boost
- Throbak Overdrive Boost Effects Layouts (blog) · 125B
- Throbak Overdrive Boost Tagboard Effects