Enclosure not stated · 4 knobs
Mad Professor Sky Blue OverdriveVerified
Based on the Mad Professor Sky Blue Overdrive· 5 other boards clone it
From the post
Here's another BJF designed circuit: the Sky Blue Overdrive. There are 4 controls: Z adjusts input impedance, Distort. controls gain, Texture adjusts the hard clipping, and finally the Volume. It uses 3mm LEDs in the feedback loop of the opamp, and then JFETs for hard clipping.
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 28 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 14.7K x2 at the top left either side of the 2M: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×2 | 14.7K | 14.7k | read from the layout by eye | |
| ×1 | 2M | 2M | read from the layout by eye | |
| ×1 | 3K | 3k | read from the layout by eye | |
| ×1 | 1.2K | 1.2k | read from the layout by eye | |
| ×3 | 47K | 47k | read from the layout by eye | |
| ×2 | 470Ω | 470 | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×1 | 1.8K | 1.8k | read from the layout by eye | |
| ×1 | 5.1K | 5.1k | read from the layout by eye | |
| ×1 | 1.3K | 1.3k | read from the layout by eye | |
| ×1 | 47Ω | 47 | read from the layout by eye | |
| Capacitors 7 | ||||
| ×2 | 220nF | 220n | read from the layout by eye | |
| ×1 | 4.7nF | 4.7n | read from the layout by eye | |
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×3 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4007 | 1N4007 | printed 4007; read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | 2N3819 | 2N3819 | JFET; read from the layout by eye | |
| Q2 | 2N3819 | 2N3819 | JFET; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | OP275 | OP275 | read from the layout by eye | |
| Potentiometers 4 | ||||
| Z | A500K | A500k | Potentiometer | read from the layout by eye |
| Distort | A1M | A1M | Potentiometer | read from the layout by eye |
| Texture | B1K | B1k | Potentiometer | read from the layout by eye |
| Volume | B50K | B50k | Potentiometer | read from the layout by eye |
| LEDs 2 | ||||
| D1 | 3mm red LED | 3MM RED LED | read from the layout by eye | |
| D2 | 3mm red LED | 3MM RED LED | read from the layout by eye | |
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