1590B · 5 knobs
Mad Professor Sky Blue OverdriveVerified
Based on the Mad Professor Sky Blue Overdrive· 5 other boards clone it
From the post
This is a modded version of the Sky Blue Overdrive, with a Tone control added, Texture control changed from an unnecessary dual to standard single 1K linear pot, and changes to the Z control to make it more useful. 1590B friendly if you can squeeze 5 pots in there.
Info about the original:
BJF design fine-tuned overdrive pedal
Hand-made in Finland premium quality overdrive pedal.
Mad Professor Sky Blue Overdrive (SBOD) is a very unique four knob pedal designed to overdrive already distorted amplifiers as well as provide light overdrive or soft distortion on clean sounds. Special feature on this pedal is that you can adjust the feel and dynamics with Texture and Z knobs.
The Texture allows changing how and when circuit distorts as well as adjusting overall EQ.
The Z is a control that creates an adjustable load to the instrument connected to the SBOD input. With standard passive pickup loaded guitars dialing this control will adjust the upper resonant peak of the pickups. It also affects the taper of the volumecontrol on the guitar, adjusting how the tone cleans up when using the guitar volume knob.
Like all Mad Professor pedals SBOD is hand made in Finland using only premium components, to give years of trouble free operation with superb musical tone.
Controls
VOLUME:sets the output volume of the effect
DISTORT.: controls the distortion or overdrive effect
Z: is a control that creates an adjustable load to the instrument connected to the SBOD input. With standard guitars dialing this control will adjust the upper resonant peak of the pickups and also affect the taper of the volumecontrol on the guitar for easy setting of clean to distorted just from the volume control of guitar. This effect is masked if SBOD is driven by a buffered output such as from another guitar pedal or from active pickups
TEXTURE: allows changing how and when the circuit distorts as well as adjusting overall EQ. Dialing this control appears to adjust midrange, while it gives this impression from adjusting compression. Turning CCW gives more saturated effect that is easily distorted, turning CW gives a slight treble boost and less compression (compression is used here to describe density of distortion since overall sound may be distorted throughout the dial)
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 30 rows
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Check before you build · 2 values the reader of this layout was not sure of
- 14K7 (two, left edge): printed clearly, unusual value
- 100p between D1 and D2 (top left): small turned text, reads 100p
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×1 | 2K2 | 2.2k | read from the layout by eye | |
| ×2 | 14K7 | 14.7k | read from the layout by eye | |
| ×3 | 47K | 47k | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×1 | 1K2 | 1.2k | 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 | 5K1 | 5.1k | read from the layout by eye | |
| ×1 | 1K3 | 1.3k | read from the layout by eye | |
| ×1 | 47R | 47 | read from the layout by eye | |
| ×2 | 470R | 470 | read from the layout by eye | |
| ×1 | 620R | 620 | read from the layout by eye | |
| Capacitors 7 | ||||
| ×1 | 100p | 100p | read from the layout by eye | |
| ×1 | 4n7 | 4.7n | read from the layout by eye | |
| ×1 | 47n | 47n | read from the layout by eye | |
| ×2 | 100n | 100n | read from the layout by eye | |
| ×1 | 220n | 220n | read from the layout by eye | |
| ×3 | 1u | 1u | electrolytic; read from the layout by eye | |
| ×1 | 100u | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D3 | ? | ? | value not given; drawn as a black diode on the 9V supply; 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 | ||||
| IC | OP275 | OP275 | read from the layout by eye | |
| Potentiometers 5 | ||||
| Z | A1M | A1M | Potentiometer | read from the layout by eye |
| Distortion | A1M | A1M | Potentiometer | read from the layout by eye |
| Tone | B2.5K | B2.5k | 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 | ? | ? | value not given; drawn as a red LED; read from the layout by eye | |
| D2 | ? | ? | value not given; drawn as a red LED; read from the layout by eye | |
Other boards based on the Mad Professor Sky Blue Overdrive
- Mad Professor Blue Sky Overdrive Dirtbox Layouts
- Mad Professor Sky Blue Overdrive Effects Layouts (blog)
- Sky Blue OD PCBWay: Glory to Ukraine
- Skylight Overdrive PedalPCB · 125B · $8.00
- Mad Professor Sky Blue Overdrive (with mods) Revolution Deux