Enclosure not stated · 2 knobs
ETI Fuzz Struzz (a.k.a. Guitar Effects Unit)Verified
Based on the ETI Fuzz Struzz (a.k.a. Guitar Effects Unit)
From the post
There was a mistake on the layout, that's now fixed. This calls for both +9V and -9V supply. Use of inverter pump daughter board is recommended.
The GEU is good sounding octave fuzz, with an optional mode of just fuzz. The fuzz is a fully rectified signal and is quite chewy. For some the Fuzz alone might not be loud enough, this can be fixed by raising the value of the 820 ohm resistor and lowering the 39k one. Or one could just replace both with a normal volume pot for a more standard approach. The "struzz" is the fuzz with an octave higher signal mixed in. Good for singal notes and leads.
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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 19 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×5 | 10K | 10k | read from the layout by eye | |
| ×2 | 1K | 1k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 39K | 39k | read from the layout by eye | |
| ×1 | 820Ω | 820 | read from the layout by eye | |
| ×1 | 270Ω | 270 | read from the layout by eye | |
| ×1 | 680K | 680k | read from the layout by eye | |
| ×1 | 8.2K | 8.2k | read from the layout by eye | |
| ×1 | 6.8K | 6.8k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 2 | ||||
| ×2 | 1uF | 1u | read from the layout by eye | |
| ×1 | 560pF | 560p | read from the layout by eye | |
| Diodes 2 | ||||
| D1 | 1N4148 | 1N4148 | read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | MPS6515 | MPS6515 | Q1 was MPS6515 (try 2N5088 or similar); read from the layout by eye | |
| ICs 1 | ||||
| IC1 | JRC4558 | JRC4558 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Fuzz | B1M | B1M | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | optional; read from the layout by eye |
| Switches 1 | ||||
| Fuzz/Struzz | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |