Enclosure not stated · 2 knobs
Sunn BuzzVerified
Based on the Sunn Buzz· 2 other boards clone it
From the post
Basically this was Sunn Amplifiers take on the Maestro FZ-1A, but with Silicon transistors instead of Germanium. Best description I found of the tone was this.
Depending on the setting of the effect control, it can go from classic "fuzz face" sounds and beyond - achieving the sustain of a big muff. It's a three stage, high gain, low voltage solid state amplifier circuit.
I was unable to to find any videos of it, but as soon as I saw the words Sunn and Fuzz together I knew I had to take a crack at this pedal.
The circuit runs off of +1.5V, just like the FZ-1A. The problem with this is that we would need either a dedicated power supply or run it off a AA battery, and you wouldn't be able to wire up an indicator LED. So what I've done is made a board for the original, and did some digging to see how to get +1.5V from a +9V source.
What I found was that using an LM317 regulator you can get the voltage down to +1.5V with the right resistors. After doing some calculations with the regulator board you should get +1.516V. If my calculations are right, that means you can run it just like any other pedal and have an indicator LED.
Original:
With Regulator:
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 16 rows
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Check before you build · 2 values the reader of this layout was not sure of
- 2uF electrolytic x2 (centre and right): printed clearly, unusual value
- 24k (column G): printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×2 | 10k | 10k | read from the layout by eye | |
| ×2 | 15k | 15k | read from the layout by eye | |
| ×1 | 220k | 220k | read from the layout by eye | |
| ×1 | 47k | 47k | read from the layout by eye | |
| ×1 | 27k | 27k | read from the layout by eye | |
| ×1 | 24k | 24k | read from the layout by eye | |
| ×1 | 4.7k | 4.7k | read from the layout by eye | |
| Capacitors 6 | ||||
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×2 | 2uF | 2u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| Transistors 1 | ||||
| ×3 | 2N2923 | 2N2923 | Q1-Q3; legend: Try: BC183, BC548; read from the layout by eye | |
| Potentiometers 2 | ||||
| Volume | A50K | A50k | Potentiometer | read from the layout by eye |
| Buzz | A5K | A5k | Potentiometer | read from the layout by eye |
Other boards based on the Sunn Buzz
- Sunn Buzz Dirtbox Layouts
- Sunn Buzz SB-1G Effects Layouts (blog)