Enclosure not stated · 5 knobs
Throbak Overdrive BoostVerified
Based on the Throbak Overdrive Boost· 2 other boards clone it
From the post
Very nice adaptation of Colorsound Overdriver with a few very nice mods. And the manufacturer isn't shy about telling us where the circuit came from. Very nice.
Throbak Electronics offers the Overdrive Boost. Throbak has reproduced and improved the circuit of the original Colorsound Overdriver (also known by the name Power Boost). The original was used by Jeff Beck and was an integral part of his 70's signature tone. The Colorsound Overdriver was also a favorite of Marc Bolan and is considered by many to be the best overdrive/booster ever made.
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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 28 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×1 | 120K | 120k | read from the layout by eye | |
| ×2 | 150K | 150k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×2 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 12K | 12k | read from the layout by eye | |
| ×2 | 4.7K | 4.7k | 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 | |
| ×1 | 33K | 33k | 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 1 | ||||
| D1 | 1N34A | 1N34A | legend: D1 is Ge (try 1N34A or 1N270); 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 | ? | ? | value not given; legend says PNP Ge (emitter not connected); read from the layout by eye | |
| Potentiometers 5 | ||||
| Pregain | B500K | B500k | Potentiometer | a trimmer in the original unit; read from the layout by eye |
| Gain | C10K | C10k | Potentiometer | 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 |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×3 | 10K | 10k | read from the layout by eye | |
| Switches 2 | ||||
| Pregain | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |
| Ge | SPST on/off | SPST ON/OFF | toggle; read from the layout by eye | |
Other boards based on the Throbak Overdrive Boost
- Throbak Overdrive Boost Dirtbox Layouts
- Throbak Overdrive Boost Effects Layouts (blog) · 125B