Enclosure not stated · 3 knobs
Himmelstrutz FettoVerified
Based on the Himmelstrutz Fetto· 3 other boards clone it
- Category
- Distortion
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Distortion, Himmelstrutz, Overdrive
From the post
Here's an original design by Himmelstrutz Elektro Art, the Fetto. It's a heavy overdrive/distortion circuit using 3 JFETs (probably 2SK170GR, but the names were sanded off the original traced by SoulSonic). These have DGS pinouts, so they're not J201, 2N5457, etc. One of the unique things about this circuit is the number of removable jumpers on the circuit board. These can be removed to tweak the sound of the effect, along side several DIP switches and 2 trimmers. In the layout below, I've replaced the removable jumpers with DIP switches for easier tweaking. The only jumper that isn't on a switch (and I don't think it was removable on the originals) is the one in parallel with the 100nF output capacitor. Not sure why this one is there. You can check out the schematic 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 Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 27 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 2.2uF electrolytic at the bottom right corner (by Gain 1): printed clearly as 2.2uF like the other one, but the schematic in the same post has 4.7uF there (C12)
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×2 | 470Ω | 470 | read from the layout by eye | |
| ×3 | 1K | 1k | read from the layout by eye | |
| ×3 | 12K | 12k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 68K | 68k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 12 | ||||
| ×1 | 220pF | 220p | read from the layout by eye | |
| ×2 | 470pF | 470p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×2 | 2.2nF | 2.2n | read from the layout by eye | |
| ×2 | 4.7nF | 4.7n | read from the layout by eye | |
| ×2 | 6.8nF | 6.8n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×1 | 15nF | 15n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×1 | 200nF | 200n | read from the layout by eye | |
| ×2 | 2.2uF | 2.2u | electrolytic; read from the layout by eye | |
| ×1 | 220uF | 220u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4004 | 1N4004 | read from the layout by eye | |
| Transistors 1 | ||||
| ×3 | 2SK170GR | 2SK170GR | JFET, Q1-3; read from the layout by eye | |
| Potentiometers 3 | ||||
| Gain | A500K | A500k | Potentiometer | read from the layout by eye |
| Presence | A50K | A50k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Trimmers 2 | ||||
| Treble 3 | 100K | 100k | read from the layout by eye | |
| Gain Trim | 500K | 500k | read from the layout by eye | |
| Switches 1 | ||||
| ×5 | 2-position DIP switch | 2-POSITION DIP SWITCH | Bass 1/Voice, Treble 2/Mid Cut, Treble 1/Bass 2, Bright 1/Gain 2, Bright 2/Gain 1; read from the layout by eye | |
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