Enclosure not stated · 2 knobs
Hornby Skewes Zonk Machine
Based on the Hornby Skewes Zonk Machine· 4 other boards clone it
From the vendor
The Zonk Machine, made in Leeds in 1965-66, is a near copy of the Tone Bender MKI: three germanium PNP transistors with an emitter-follower input, smaller input and output caps and a few resistor changes. This drawing adds a 1M input pulldown and an LED.
Schematic
The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.
Parts list 22 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| R1 | 1M | 1M | input pulldown; read from the schematic by eye | |
| R2 | 1M | 1M | read from the schematic by eye | |
| R3 | 4.7K | 4.7k | Q1 emitter; read from the schematic by eye | |
| R4 | 470K | 470k | read from the schematic by eye | |
| R5 | 2.2K | 2.2k | read from the schematic by eye | |
| R6 | 3.3K | 3.3k | read from the schematic by eye | |
| R7 | 3.3K | 3.3k | Q2 collector; read from the schematic by eye | |
| R8 | 15K | 15k | read from the schematic by eye | |
| R9 | 10K | 10k | Q3 collector; read from the schematic by eye | |
| R10 | 56K | 56k | read from the schematic by eye | |
| R11 | 2.2M | 2.2M | read from the schematic by eye | |
| R12 | 8.2K | 8.2k | LED resistor; read from the schematic by eye | |
| Capacitors 4 | ||||
| C1 | 1n | 1n | input; read from the schematic by eye | |
| C2 | 25u | 25u | electrolytic; read from the schematic by eye | |
| C3 | 100n | 100n | read from the schematic by eye | |
| C4 | 470n | 470n | output; read from the schematic by eye | |
| Transistors 3 | ||||
| Q1 | A02650 | A02650 | germanium PNP, TI; read from the schematic by eye | |
| Q2 | OC75 | OC75 | germanium PNP; read from the schematic by eye | |
| Q3 | OC44 | OC44 | germanium PNP; read from the schematic by eye | |
| Potentiometers 2 | ||||
| Fuzz | B50K | B50k | Potentiometer | read from the schematic by eye |
| Swell | A500K | A500k | Potentiometer | read from the schematic by eye |
| LEDs 1 | ||||
| LED | LED | LED | read from the schematic by eye | |
Other boards based on the Hornby Skewes Zonk Machine
- Hornby Skewes Zonk Machine Effects Layouts (blog)
- Hornby Skewes Zonk Machine (Jonaz version) Revolution Deux
- Hornby Skewes Zonk Machine (alternate version) Revolution Deux
- Hornby Skewes Zonk Machine turretboard.org