Enclosure not stated · 3 knobs
Boss FA-1 FET AmplifierVerified
Based on the Boss FA-1 FET Amplifier· 5 other boards clone it
From the post
Slightly modified, subbing the two single op amps of the original to a dual. 1458 or 4558 should match the spec of the original ones.
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 25 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×3 | 470K | 470k | read from the layout by eye | |
| ×3 | 10K | 10k | read from the layout by eye | |
| ×2 | 15K | 15k | read from the layout by eye | |
| ×2 | 8.2K | 8.2k | read from the layout by eye | |
| ×1 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 6.8K | 6.8k | 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 | |
| ×1 | 3.3M | 3.3M | read from the layout by eye | |
| Capacitors 8 | ||||
| ×2 | 100pF | 100p | read from the layout by eye | |
| ×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 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | 2SK30 | 2SK30 | JFET; 2SK30, 2SK117; 2SK246-GR in original; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | 1458 | 1458 | 1458, 4558; 2x HA1457W in original; read from the layout by eye | |
| Potentiometers 3 | ||||
| Treble | B50K | B50k | Potentiometer | read from the layout by eye |
| Bass | B50K | B50k | Potentiometer | read from the layout by eye |
| Volume | A1M | A1M | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Switch | SPST | SPST | toggle; read from the layout by eye | |
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