125B · 5 knobs
Greer Amps Soma 63 PreampVerified
Based on the Greer Amps Soma 63· 2 other boards clone it
From the post
Cool JFET preamp circuit from Greer. Its supposed to sound like a Brownface-era Fender amp. I'd be curious what it sounds like without the transformer. Should fit just fine in a 125B with top mounted jacks. Schematic for reference.
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 32 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×1 | 47Ω | 47 | read from the layout by eye | |
| ×1 | 680Ω | 680 | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×2 | 1.5K | 1.5k | read from the layout by eye | |
| ×2 | 5.6K | 5.6k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×2 | 22K | 22k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| Capacitors 8 | ||||
| ×1 | 220pF | 220p | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×2 | 22nF | 22n | read from the layout by eye | |
| ×1 | 33nF | 33n | read from the layout by eye | |
| ×4 | 47nF | 47n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | J201 | J201 | JFET; read from the layout by eye | |
| Q2 | J201 | J201 | JFET; read from the layout by eye | |
| Q3 | J201 | J201 | JFET; read from the layout by eye | |
| Q4 | J201 | J201 | JFET; read from the layout by eye | |
| Transformers 1 | ||||
| ×1 | TY-141P | TY-141P | transformer; read from the layout by eye | |
| Potentiometers 5 | ||||
| Gain | A500K | A500k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Presence | B50K | B50k | Potentiometer | read from the layout by eye |
| Treble | B250K | B250k | Potentiometer | read from the layout by eye |
| Bass | A500K | A500k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×4 | 100K | 100k | read from the layout by eye | |
Other boards based on the Greer Amps Soma 63
- Greer Soma 63 Dirtbox Layouts
- Neurocyton Preamp PedalPCB · 125B · $12.00