Enclosure not stated · 4 knobs
Escobedo Ugly FaceVerified
Based on the Escobedo Ugly Face· 3 other boards clone it
From the post
Today's #fuzzfriday is an Tim Escobedo design: the Ugly Face. Here's what he had to say about it:
The Uglyface is a completely all-out fuzz unit for fat, noisy buzzsaw sounds. P1 sets the threshold for triggering the fuzz. This characteristic also means that notes can fade out abruptly when they decay below the set level. P2 is the frequency control. It functions as an unorthodox tone control, at one extreme producing synthesized octave down effects, at the other extreme, thin and nasal tones. When the threshold is set below the trigger point, the Uglyface becomes a free running oscillator, with P2 controlling the frequency. P3 is a Sensitivity control, regulating how much of the guitar signal will modulate the Frequency control.
Make sure the second IC is a CMOS 555 otherwise the effect won't work. 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 16 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| Capacitors 3 | ||||
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×2 | 2.2uF | 2.2u | electrolytic; read from the layout by eye | |
| ×3 | 100nF | 100n | read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| ICs 2 | ||||
| ×1 | JRC386D | JRC386D | read from the layout by eye | |
| ×1 | ICM7555 | ICM7555 | read from the layout by eye | |
| Opto 1 | ||||
| ×1 | VTL5C2 | VTL5C2 | read from the layout by eye | |
| Potentiometers 4 | ||||
| Sensitivity | B1K | B1k | Potentiometer | read from the layout by eye |
| Frequency | B100K | B100k | Potentiometer | read from the layout by eye |
| Threshold | B10K | B10k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
Other boards based on the Escobedo Ugly Face
- Face Disaster Dead Air Studios · $11.00
- Escobedo Ugly Face Dirtbox Layouts
- Ugly Face Fuzz Dog · 1590B · £31.20