1590B · 3 knobs
Mad Professor Little Green WonderVerified
Based on the Mad Professor Little Green Wonder· 4 other boards clone it
From the post
I feel like in the past few months I've done a ton Tube Screamer variants. Well here's another one, but one of the more interesting ones I've seen. Bjorn designed this one for Mad Professor and utilizes a dual-gang pot for the Body control that affects both the treble and bass response. The IC was originally a LF353, but that was changed to the TLC272CP as it was more readily available and worked at lower voltages and breaks up easier. The only schematic I found online was a little difficult to read (it was hand drawn) so I've drawn that up in Eagle as well. Pots are board mounted and will fit nicely in a 1590B.
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 23 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×4 | 5.6K | 5.6k | read from the layout by eye | |
| ×4 | 27K | 27k | read from the layout by eye | |
| ×3 | 2K | 2k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 47Ω | 47 | read from the layout by eye | |
| Capacitors 6 | ||||
| ×2 | 47nF | 47n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 220nF | 220n | read from the layout by eye | |
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×3 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4007 | 1N4007 | read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | TLC272 | TLC272 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Drive | B500K | B500k | Potentiometer | board pads labelled Gain; read from the layout by eye |
| Body | B20K | B20k | Potentiometer | dual; read from the layout by eye |
| Volume | B50K | B50k | Potentiometer | read from the layout by eye |
| LEDs 2 | ||||
| D1 | 3mm green LED | 3MM GREEN LED | on board; read from the layout by eye | |
| D2 | 3mm green LED | 3MM GREEN LED | on board; read from the layout by eye | |
Other boards based on the Mad Professor Little Green Wonder
- Mad Professor Little Green Wonder w. mods Dirtbox Layouts
- Mad Little Wonder PCB Guitar Mania · 125B · €9.90
- Mad Professor Little Green Wonder Revolution Deux
- Mad Professor Little Green Wonder turretboard.org