Enclosure not stated · 3 knobs
DOD FX50-B Overdrive PlusVerified
Based on the DOD FX50-B Overdrive Plus
From the post
Here's DOD's step up from FX50 :)
Just finished building this. The pot tapers are not mentioned in the schematic, so i went with the usual tapers from most designs. However. Volume needs to be linear and drive reverse log to get the circuit act like the original unit. Other thing was the 470R resistor on the bottom left. 470R gave me lots of oscillation when gain was cranked, so i swapped that to 4K7, which fixed the problem. I do believe that's an error in the schematic i did this from, but i can't be certain. Anyway - it works like a charm and is very nice OD indeed. Fat and smooth.
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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 25 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×3 | 10K | 10k | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×2 | 3.3K | 3.3k | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| ×1 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 18K | 18k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| Capacitors 9 | ||||
| ×3 | 120pF | 120p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×2 | 10nF | 10n | read from the layout by eye | |
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×3 | 1uF | 1u | read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 330uF | 330u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×4 | 1N4148 | 1N4148 | D1-D4; read from the layout by eye | |
| D5 | 1N4001 | 1N4001 | or 1N5817; read from the layout by eye | |
| ICs 2 | ||||
| IC1 | 1458 | 1458 | read from the layout by eye | |
| IC2 | LF353 | LF353 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Drive | C500K | C500k | Potentiometer | rev. log; read from the layout by eye |
| Tone | B100K | B100k | Potentiometer | read from the layout by eye |
| Volume | B100K | B100k | Potentiometer | wires labelled Level; read from the layout by eye |