Enclosure not stated · 2 knobs
1981 Inventions LVLVerified
Based on the 1981 Inventions LVL· 2 other boards clone it
From the post
Here's the new boost from Matt Hoopes. Cornish buffer up front, so like the DRV, not a true bypass effect unless you want to wire it that way. Signal is then amplified by half of a 1458 op amp, and then back to back inverting and tone shaping op amp stages with the LM833. Schematic below. If you're going to wire it for true bypass you can omit C4, and R7-8. Also note that D1-2 aren't acting as clipping diodes, but as (I think?) a limiter to prevent clipping or at least too much of it.
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 28 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 1 value the reader of this layout was not sure of
- 6.81K right of centre and the two 475Ω near the bottom: printed clearly, unusual values (1% series)
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×1 | 10Ω | 10 | read from the layout by eye | |
| ×2 | 475Ω | 475 | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×2 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 6.81K | 6.81k | read from the layout by eye | |
| ×4 | 10K | 10k | read from the layout by eye | |
| ×3 | 22K | 22k | read from the layout by eye | |
| ×1 | 39K | 39k | read from the layout by eye | |
| ×5 | 100K | 100k | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| Capacitors 9 | ||||
| ×2 | 100pF | 100p | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×3 | 100nF | 100n | read from the layout by eye | |
| ×3 | 220nF | 220n | read from the layout by eye | |
| ×3 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| ×1 | 220uF | 220u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | 3.3V | 3V3 | zener, printed 3.3v; read from the layout by eye | |
| ×1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | 2N3904 | 2N3904 | read from the layout by eye | |
| ICs 2 | ||||
| ×1 | LM1458 | LM1458 | read from the layout by eye | |
| ×1 | LM833 | LM833 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Gain | C100K | C100k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
Other boards based on the 1981 Inventions LVL
- 1981 Inventions LVL Dirtbox Layouts
- 1991 Inventor PCB Guitar Mania · 125B · €11.90