Enclosure not stated · 2 knobs
Amtron UK854 Fuzz BoxVerified
Based on the Amtron UK854 Fuzz Box
From the post
This thing is close to a classic Fuzz Face, but just by looking at the schematic, i seemed like this baby has tons more bass and wilder fuzz control with much higher values than its idol. Simple and small, but some of you Fuzz Afficionadas might find this good thing to build.
I promise not to post any more Fuzz Face derivatives for a while :)
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Edit! Just built this, and as i suspected, the stock value of 27K is not biasing my 2N2222s correctly. Replaced that with 5K1, and now i have bassy vintage fuzz tone :) You might need to find a value to match your transistor instead of that stock value.
Here's rejigged layout with stock 22K resistor replaced by 25K trimpot. That should let you bias your favourite transistors correctly.
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 11 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×1 | 82K | 82k | read from the layout by eye | |
| ×1 | 27K | 27k | alternative layout uses a 25K trimmer (VR1) here; read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 330K | 330k | read from the layout by eye | |
| Capacitors 2 | ||||
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N5817 | 1N5817 | polarity protection; read from the layout by eye | |
| Transistors 1 | ||||
| ×2 | BC209 | BC209 | Transistors were BC209 or BC239; use any NPN 250-300 hFE (2N3904, 2N2222, BC108B..); read from the layout by eye | |
| Potentiometers 2 | ||||
| Fuzz | B470R | B470 | Potentiometer | read from the layout by eye |
| Volume | A10K | A10k | Potentiometer | read from the layout by eye |