Enclosure not stated · 2 knobs
Hornby Skewes Zonk MachineVerified
Based on the Hornby Skewes Zonk Machine· 4 other boards clone it
From the post
The Zonk Machine was one of the many British fuzz boxes that came out in the mid-60s. Like the Tone Bender Mk II it was designed to compete with, it also was featured 3 germanium transistors but offered more of a boost and slight oscillation (in a good way). This is a positive ground effect so unless you use a charge pump or can make it work with NPN germanium transistors you can't daisy chain it with other negative ground pedals. If you are going the NPN route, be sure to rotate the polarized caps an the diode 180º. 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 20 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×2 | 3.3K | 3.3k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| Capacitors 5 | ||||
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 470nF | 470n | read from the layout by eye | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | TI A02 650 | TI A02 650 | PNP germanium; read from the layout by eye | |
| Q2 | OC75 | OC75 | PNP germanium; read from the layout by eye | |
| Q3 | OC44 | OC44 | PNP germanium; read from the layout by eye | |
| Potentiometers 2 | ||||
| Fuzz | B50K | B50k | Potentiometer | read from the layout by eye |
| Swell | A500K | A500k | Potentiometer | read from the layout by eye |
Other boards based on the Hornby Skewes Zonk Machine
- Hornby Skewes Zonk Machine Revolution Deux
- Hornby Skewes Zonk Machine (Jonaz version) Revolution Deux
- Hornby Skewes Zonk Machine (alternate version) Revolution Deux
- Hornby Skewes Zonk Machine turretboard.org