1590A · 2 knobs
ESR Graphic FuzzVerified
Based on the ESR Graphic Fuzz
From the post
Gnarly, oscillating fuzz tone–this is a bit of a weird one. The original used both positive and negative 9v (which I have a hard time wrapping my head around). FSB forum member Induction altered the circuit to support standard power supplies, so no need for a 9v battery or adding a +/- converter. And it should sound very close to the original. Here's his schematic for reference. Should easily fit in a 1590a. There's also a fabricated version of this circuit in the store, the OSCillot.
Here's a demo of it against an IdiotBox Blasteroid:
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 11 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 4 | ||||
| ×3 | 10K | 10k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 2M | 2M | read from the layout by eye | |
| ×1 | 220Ω | 220 | read from the layout by eye | |
| Capacitors 3 | ||||
| ×4 | 100nF | 100n | read from the layout by eye | |
| ×2 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| ICs 1 | ||||
| ×1 | 741 | 741 | op amp, printed as 741; read from the layout by eye | |
| Potentiometers 2 | ||||
| Filter | B1M | B1M | Potentiometer | read from the layout by eye |
| Level | A10K | A10k | Potentiometer | read from the layout by eye |