Enclosure not stated · 4 knobs
Death by Audio Assault System - Transistor channelVerified
Based on the Death By Audio Assault System - Transistor channel
From the post
An old super rare DBA pedal which was a two channel fuzz. Here is the transistor channel which resmebles most older DBA designs; cascaded reverse beta transistor gain stages. Socketing your transistors is a must since you need to find ones that doesn't gate too much. Also, there is a Filter control which is a variation of twin notch filter. Shape control is a simple ground lift for the filter circuit. A big thank you to Nils at Moonn Electronics for the trace! Schematic is avaiable HERE.
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 Dirtbox Layouts. 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
- 100nF at column 8, rows A-C: drawn as a small yellow ceramic like the 680pF caps, printed clearly as 100nF
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 6 | ||||
| ×1 | 1.5K | 1.5k | read from the layout by eye | |
| ×2 | 27K | 27k | read from the layout by eye | |
| ×4 | 180K | 180k | read from the layout by eye | |
| ×4 | 910K | 910k | read from the layout by eye | |
| ×1 | 4.7M | 4.7M | read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 4 | ||||
| ×4 | 680pF | 680p | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×5 | 470nF | 470n | read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| ×4 | 2N5088 | 2N5088 | Q1-Q4; read from the layout by eye | |
| Potentiometers 4 | ||||
| Drive | B25K | B25k | Potentiometer | read from the layout by eye |
| Filter | A250K | A250k | Potentiometer | dual; read from the layout by eye |
| Shape | B100K | B100k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |