Enclosure not stated · 2 knobs
Ampeg ScramblerVerified
Based on the Ampeg Scrambler· 10 other boards clone it
From the post
It's Fuzz Friday time again, and this week I give you the Ampeg Scrambler. This one's a pretty rare one, even back when it was originally made in the late 60s. It's a pretty crazy octave fuzz with a clean blend. Originals used 2N5306 for Q1, 3, and 4, and a BC169 for Q2, but those could be difficult to source, and it works fine with modern equivalents (mind the pinouts if using original transistors). If you want to add a master volume control, use a 100k pot (adjust to taste) and wire lug 3 to the Out pad of the board. Lug 2 is now your output, and lug 1 goes to ground. This sounds pretty cool on bass as well as guitar.
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 21 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×2 | 220K | 220k | read from the layout by eye | |
| ×1 | 8.2K | 8.2k | read from the layout by eye | |
| ×3 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×2 | 47K | 47k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×1 | 220Ω | 220 | read from the layout by eye | |
| Capacitors 4 | ||||
| ×3 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| ×2 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| Diodes 2 | ||||
| ×5 | 1N4148 | 1N4148 | read from the layout by eye | |
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | MPSA14 | MPSA14 | MPSA14 or similar; read from the layout by eye | |
| Q2 | 2N5088 | 2N5088 | 2N5088 or similar; read from the layout by eye | |
| Q3 | MPSA14 | MPSA14 | MPSA14 or similar; read from the layout by eye | |
| Q4 | MPSA14 | MPSA14 | MPSA14 or similar; read from the layout by eye | |
| Potentiometers 2 | ||||
| Texture | B10K | B10k | Potentiometer | read from the layout by eye |
| Blend | B50K | B50k | Potentiometer | read from the layout by eye |
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