1590B · 3 knobs
Boss FA-1 FET Amplifier
Based on the Boss FA-1 FET Amplifier· 5 other boards clone it
From the post
Originally a bit of a flop from Boss, the FET Amplifier was made famous by U2's The Edge. It features a 2-band Baxendall tone stack and the Volume control is more like a gain control. Originals use 2 single opamps that are pretty hard to come by these days, so they've been replaced by a dual opamp. Pots are board mounted and it should all fit in a 1590B.
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 25 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×1 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 6.8K | 6.8k | read from the layout by eye | |
| ×2 | 8.2K | 8.2k | read from the layout by eye | |
| ×3 | 10K | 10k | read from the layout by eye | |
| ×2 | 15K | 15k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 3.3M | 3.3M | read from the layout by eye | |
| Capacitors 7 | ||||
| ×2 | 5.6nF | 5.6n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×2 | 33nF | 33n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×1 | 470nF | 470n | read from the layout by eye | |
| ×4 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 1 | ||||
| ×1 | J201 | J201 | JFET; named on the wiring diagram; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | 1458 | 1458 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Volume | A1M | A1M | Potentiometer | read from the layout by eye |
| Bass | B50K | B50k | Potentiometer | read from the layout by eye |
| Treble | B50K | B50k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Cut | SPST | SPST | read from the layout by eye | |
Other boards based on the Boss FA-1 FET Amplifier
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- Prism (Legacy) Aion FX · 1590B
- Boss FA-1 FET Amplifier Dirtbox Layouts
- Amp-fet-amine One Five Cats Pedals · 1590B · £4.50
- Boss FA-1 FET Preamp Tagboard Effects