Enclosure not stated · 2 knobs
Earthquaker Devices BellowsVerified
Based on the EarthQuaker Devices Bellows· 7 other boards clone it
- Category
- Distortion
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Distortion, Earthquaker Devices, Fuzz, Overdrive
From the post
For Fuzz Friday here's the Bellows from Earthquaker. I picked up one of these late last year and was able to trace it. It's fairly simple but sounds really good. It's really similar to an Electra circuit, but with a JFET going between the base and collector of the transistor. Here's the schematic for reference.
In the originals the resistors are large carbon comp and all caps are film box types (with the exception of C3). I breadboarded this with mostly metal film resistors and with whatever caps were closest, along with a J201 for the JFET and it sounded very much like the original.
Here's a few pics of the original guts, btw. A lot of the circuitry on the board is for the relay bypass (that I did not trace as it would be mostly pointless with out the code for the PIC).
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 Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 12 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 3 | ||||
| ×2 | 10K | 10k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 200Ω | 200 | read from the layout by eye | |
| Capacitors 4 | ||||
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×1 | 68nF | 68n | read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | PF5102 | PF5102 | JFET; read from the layout by eye | |
| Q2 | MPSA13 | MPSA13 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Gain | B250K | B250k | Potentiometer | read from the layout by eye |
| Volume | B100K | B100k | Potentiometer | read from the layout by eye |
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