1590A · 2 knobs
Ross DistortionVerified
Based on the Ross Distortion· 2 other boards clone it
- Category
- Distortion
- Controls
- Volume · Distortion
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Distortion, Ross
From the post
The Ross Distortion is very similar to two other famous distortion boxes of the late 70s (MXR Distortion +, DOD 250). However, it uses one side of a 4558 dual opamp instead of the single opamp (741) found in the the other two, and a few other tweaks in component values. There are two versions of this circuit: the Tan version, which uses 2 germanium diodes for clipping (originals used 1N270s, but 1N60Ps or 1N34As should also work just fine), and the Black version, which uses 3 silicon diodes for asymmetrical clipping. I've drawn up 2 layouts for each version, both will fit in a 1590A. The only difference is improved power filtering and added polarity protection in the larger layouts. The yellow 1µ caps are tantalum.
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 11 rows
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Check before you build · 1 value the reader of this layout was not sure of
- The two 1uF caps are drawn as yellow polarized ovals marked '+', taken as tantalum; the drawing does not name the type
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 3 | ||||
| ×5 | 1M | 1M | read from the layout by eye | |
| ×2 | 10K | 10k | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| Capacitors 4 | ||||
| ×2 | 10nF | 10n | read from the layout by eye | |
| ×2 | 1nF | 1n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×2 | 1uF | 1u | tantalum; read from the layout by eye | |
| Diodes 1 | ||||
| ×2 | 1N270 | 1N270 | read from the layout by eye | |
| ICs 1 | ||||
| ×1 | RC4558P | RC4558P | read from the layout by eye | |
| Potentiometers 2 | ||||
| Volume | B50K | B50k | Potentiometer | read from the layout by eye |
| Distortion | C500K | C500k | Potentiometer | read from the layout by eye |
Other boards based on the Ross Distortion
- Black & Tan Effects Layouts · 125B · $10.00
- Ross Distortion Tagboard Effects