1590B · 4 knobs
Mad Professor Snow White AutoWahVerified
Based on the Mad Professor Snow White AutoWah· 4 other boards clone it
- Category
- Wah / Envelope
- Controls
- Sensitivity · Resonance · Decay · Bias
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Auto-Wah, Mad Professor
From the post
Happy New Year, everybody! I hope this year brings you all joy and much soldering. :)
By popular demand, I give you the Mad Professor Snow White AutoWah. Now stop pestering me for it. ;) This was a pretty complicated circuit to fit on a single-sided board, so there are a few jumpers (one of which is super long–bugs me, but it was the only way to make it work), but if you play your cards right you should be able to squeeze it into a 1590B like the original.
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 33 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 2 values the reader of this layout was not sure of
- 7.9K at row L, columns Q-T (right side): printed clearly, unusual value
- regulator at columns S-T, rows G-I: no value on the populated board, read as 7805 from the wiring diagram where the text overlaps a trace; TO-92 outline so presumably 78L05
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 13 | ||||
| ×5 | 330Ω | 330 | read from the layout by eye | |
| ×4 | 10K | 10k | read from the layout by eye | |
| ×4 | 6.8K | 6.8k | read from the layout by eye | |
| ×3 | 20K | 20k | read from the layout by eye | |
| ×3 | 4.7K | 4.7k | read from the layout by eye | |
| ×2 | 4.7M | 4.7M | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×2 | 47K | 47k | read from the layout by eye | |
| ×1 | 5.1K | 5.1k | read from the layout by eye | |
| ×1 | 7.9K | 7.9k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 47Ω | 47 | read from the layout by eye | |
| Capacitors 8 | ||||
| ×1 | 8.2nF | 8.2n | read from the layout by eye | |
| ×3 | 22nF | 22n | read from the layout by eye | |
| ×1 | 68nF | 68n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×1 | 220nF | 220n | read from the layout by eye | |
| ×2 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 2.2uF | 2.2u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×3 | 1N4148 | 1N4148 | read from the layout by eye | |
| ×2 | 1N4007 | 1N4007 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| Q2 | BC550C | BC550C | read from the layout by eye | |
| Q3 | BC550C | BC550C | read from the layout by eye | |
| ICs 3 | ||||
| ×1 | LM324 | LM324 | read from the layout by eye | |
| ×1 | LM13700 | LM13700 | read from the layout by eye | |
| ×1 | 7805 | 7805 | regulator, TO-92 outline; named only on the wiring diagram; read from the layout by eye | |
| Potentiometers 4 | ||||
| Sensitivity | B100K | B100k | Potentiometer | read from the layout by eye |
| Resonance | B50K | B50k | Potentiometer | read from the layout by eye |
| Decay | C1M | C1M | Potentiometer | read from the layout by eye |
| Bias | B50K | B50k | Potentiometer | read from the layout by eye |
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