125B · 5 knobs
Durham Crazy HorseVerified
Based on the Durham Crazy Horse· 6 other boards clone it
From the post
For Fuzz Friday here's an really interesting circuit from Durham that's both an overdrive and a fuzz. As the name implies helps you get some Neil Young tones, but does a lot more than that. The input stage features soft clipping in the feedback loop of an opamp, much like a Tube Screamer. The 2nd half of the opamp acts like a buffer, pushing a Fuzz Face-style stage. This then pushes another Fuzz Face-style stage that feeds into a Big Muff tone stack. The addition of the Volts control to starve the opamp of voltage makes this a really versatile pedal. I've laid this out with on board pots that will ideally fit in a 125B with top mounted jacks. Here's the schematic for reference.
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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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×5 | 22K | 22k | read from the layout by eye | |
| ×4 | 1K | 1k | read from the layout by eye | |
| ×2 | 1.5K | 1.5k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 3.3K | 3.3k | read from the layout by eye | |
| ×1 | 39K | 39k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 560Ω | 560 | read from the layout by eye | |
| Capacitors 7 | ||||
| ×3 | 100nF | 100n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×1 | 220nF | 220n | read from the layout by eye | |
| ×1 | 1uF | 1u | box film; read from the layout by eye | |
| ×3 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| ×3 | 1N4148 | 1N4148 | read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | 2N2222A | 2N2222A | read from the layout by eye | |
| Q2 | 2N2222A | 2N2222A | read from the layout by eye | |
| Q3 | MPSA13 | MPSA13 | read from the layout by eye | |
| Q4 | MPSA13 | MPSA13 | read from the layout by eye | |
| ICs 1 | ||||
| ×1 | 4558 | 4558 | read from the layout by eye | |
| Potentiometers 5 | ||||
| Gain | B250K | B250k | Potentiometer | board pads labelled Drive; read from the layout by eye |
| Fuzz | B1K | B1k | Potentiometer | read from the layout by eye |
| Volts | B1K | B1k | Potentiometer | read from the layout by eye |
| Tone | B25K | B25k | Potentiometer | read from the layout by eye |
| Level | B500K | B500k | Potentiometer | read from the layout by eye |
| LEDs 1 | ||||
| ×1 | ? | ? | on-board LED, printed only 'LED', type not given; read from the layout by eye | |
Other boards based on the Durham Crazy Horse
- Durham Crazy Horse Dirtbox Layouts
- Mad Mule - Neil Young's Weld and Rust tones in a box Fuzz Dog · 1590B · £34.80
- Mad Mule Vertical - Neil Young's Weld and Rust tones in a box Fuzz Dog · 1590B · £36.00
- Durham Crazy Horse Revolution Deux
- Little Hawk Distortion RWL Pedals · 125B
- Durham Crazy Horse Tagboard Effects