Enclosure not stated · 3 knobs
Buzzaround-AlikeVerified
Based on the MicTester Buzzaround-Alike· 1 other board clones it
From the post
Hello new and old friends! On this day AD, we have some exciting news. I, Miro have been dubbed as thee second-in-rank-admin to help Mark around on the blog. Many of you already know me from various post threads :) Anyway. I've started to draw layouts some time ago and we thought we might give a go for these too. My layouts look a bit different and there is a reason for that. I have been using Linux as my only operating system for last 8 years and the software version Mark uses, well, doesn't work too well on Linux/Java. Comments are open, so please let us know if you think this is a bad move :)
As a tryout for Miro's layouts, we have Mictester's Burns Buzzaround-Alike. Description from Mictester:
The legendary Burns Buzzaround was a slightly unusual germanium fuzz that achieved its (undeserved) reputation for two reasons - some great guitarists used them, and they are virtually unobtainable. The original consisted of two stages - a two-transistor amplifier and a distortion stage that could have both the amount of signal sent to it and the bias point adjusted by external controls. The third control was a crude tone control which fed the output. Originally, the output was unbuffered, and the leads and amplifier following would load the unit, and the top end would be rolled off, and often the tone control would have little effect.
The first stage in the sound-alike is just a high input impedance op-amp gain stage. You may wish to increase the gain by increasing the value of the feedback resistor, but it sounds pretty good as shown. In the original, the first stage didn't really have much effect on the sound - it just amplified it enough to drive the following stage into conduction.
The heart of the beast is the germanium transistor stage. Apart from using an NPN transistor, this remains true to the original (why screw up a classic?), and still gives a wide range of sounds from the thin toppy fuzz beloved of sixties bands through to gated spluttery farts, with smooth warm distortion sounds in between!
The final stage is just a buffer - it isolates the tone circuit from the outside world, and allows a full range of control from muffled to glass-shattering!
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 · 1 value the reader of this layout was not sure of
- Balance pot 22K lin: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 6 | ||||
| ×6 | 10K | 10k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×1 | 27K | 27k | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 4 | ||||
| ×2 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×3 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×3 | 100nF | 100n | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N270 | 1N270 | germanium (try 1N270, 1N34A); read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | 2N1302 | 2N1302 | try any NPN germanium; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | TL072 | TL072 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Sustain | B100K | B100k | Potentiometer | read from the layout by eye |
| Timbre | B100K | B100k | Potentiometer | read from the layout by eye |
| Balance | B22K | B22k | Potentiometer | read from the layout by eye |
Other boards based on the MicTester Buzzaround-Alike
- Mictester Burns Buzzaround-Alike Revolution Deux