125B · 5 knobs
Throbak Overdrive BoostVerified
Based on the Throbak Overdrive Boost· 2 other boards clone it
From the post
Pretty much a Colorsound Overdriver clone. Laid this out for a 125B (because of the dual footswitches) with board mounted pots. The boost footswitch bypasses the PreGain pot and only uses one side of a DPDT. Use the other side for LED wiring. If the off board wiring is confusing, check out the thread with the schematic here on FSB. The diagram is for a vero layout but the wiring is the same.
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 Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 29 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 200pF next to Q2: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 8 | ||||
| ×2 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 3.9K | 3.9k | read from the layout by eye | |
| ×2 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 5.6K | 5.6k | read from the layout by eye | |
| ×1 | 12K | 12k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 120K | 120k | read from the layout by eye | |
| ×2 | 150K | 150k | read from the layout by eye | |
| Capacitors 7 | ||||
| ×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 | |
| ×4 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| D1 | germanium | GERMANIUM | legend: D1: germanium, no part number; read from the layout by eye | |
| ×1 | 1N4001 | 1N4001 | 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 | germanium, metal can; read from the layout by eye | |
| Potentiometers 5 | ||||
| PreGain | B500K | B500k | Potentiometer | read from the layout by eye |
| Gain | C10K | C10k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | labelled Master on the board; read from the layout by eye |
| Bass | B100K | B100k | Potentiometer | read from the layout by eye |
| Treble | B100K | B100k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×3 | 10K | 10k | read from the layout by eye | |
| Switches 2 | ||||
| Ge | SPST | SPST | Ge Sw; read from the layout by eye | |
| Pre | DPDT | DPDT | Pre Sw: DPDT footswitch; In goes to Pre Sw 2; read from the layout by eye | |
Other boards based on the Throbak Overdrive Boost
- Throbak Overdrive Boost Dirtbox Layouts
- Throbak Overdrive Boost Tagboard Effects