Enclosure not stated · 3 knobs
Hungry Robot Mosfet ScreamerVerified
Based on the Hungry Robot MOSFET Screamer· 1 other board clones it
From the post
About a month or so ago, Hungry Robot Pedals made a limited run of overdrives called the Mosfet Screamer. As the name implies, it's based of the classic Ibanez Tube Screamer, but with a fair amount of modification. Eric from Hungry Robot was kind enough to share the schematic on Instagram, so a big thanks to him. Here's what he had to say about it:
The Mosfet Screamer strips the input and output buffers and adds a pre-gain Mosfet Gain stage to make it a bit more beefy. One thing I wanted was a more usable tone control, so I did some value changes and added a treble bleed on the volume section. Standard Gain, Tone, Volume controls and two toggles switches (One to select between two clipping options and the other to adjust the gain of the Mosfet Stage from low to high).
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 30 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 1uF right of the 4558: drawn as a grey rounded box rather than a round can, taken as a film/box capacitor, not electrolytic
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 8 | ||||
| ×3 | 4.7K | 4.7k | read from the layout by eye | |
| ×3 | 1K | 1k | read from the layout by eye | |
| ×2 | 51K | 51k | read from the layout by eye | |
| ×1 | 240Ω | 240 | read from the layout by eye | |
| ×5 | 10K | 10k | read from the layout by eye | |
| ×2 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 11 | ||||
| ×1 | 22pF | 22p | read from the layout by eye | |
| ×1 | 51pF | 51p | read from the layout by eye | |
| ×1 | 3.3nF | 3.3n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×1 | 82nF | 82n | 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 | 1uF | 1u | read from the layout by eye | |
| ×2 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 4 | ||||
| ×1 | BAT41 | BAT41 | read from the layout by eye | |
| ×1 | 1N4148 | 1N4148 | read from the layout by eye | |
| ×2 | 1N914 | 1N914 | read from the layout by eye | |
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 1 | ||||
| ×1 | BS170 | BS170 | MOSFET, named on the wiring diagram; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | 4558 | 4558 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Gain | B500K | B500k | Potentiometer | read from the layout by eye |
| Tone | B25K | B25k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Switches 2 | ||||
| Clip | SPDT | SPDT | read from the layout by eye | |
| Hi/Lo | SPST | SPST | wires labelled Lo/Hi; read from the layout by eye | |
Other boards based on the Hungry Robot MOSFET Screamer
- Hungry Robot MOSFET Screamer Dirtbox Layouts