Enclosure not stated · 3 knobs
Fulltone OCDVerified
Based on the Fulltone OCD· 12 other boards clone it
From the post
I've been meaning to redo the OCD with proper board mounted pots, so here it is. It's a development on the Voodoo Labs Overdrive, with MOSFET clipping and a simple tone control. Fulltone has made a few versions of this with a few minor changes over the years. They're all mostly the same, but the biggest differences is in the pot values. Below is a partial bill of materials outlining the differences between the first 4 OCD versions, along with a couple value changes to mod the bass response.
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 27 rows
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Check before you build · 1 value the reader of this layout was not sure of
- The two transistors either side of D1 are unlabelled on the board; the wiring diagram prints '7000', entered as 2N7000
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| R1 | ? | ? | value not given, see BOM; read from the layout by eye | |
| R2 | ? | ? | value not given, see BOM; read from the layout by eye | |
| ×1 | 18K | 18k | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×5 | 10K | 10k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| ×1 | 39K | 39k | read from the layout by eye | |
| Capacitors 8 | ||||
| C1 | ? | ? | value not given, see BOM; read from the layout by eye | |
| ×2 | 220pF | 220p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×2 | 100nF | 100n | 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 | |
| Diodes 2 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| D1 | ? | ? | value not given, see BOM; read from the layout by eye | |
| Transistors 1 | ||||
| ×2 | 2N7000 | 2N7000 | MOSFET; printed 7000 on the wiring diagram; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | TL082 | TL082 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Drive | ? | ? | Potentiometer | value not given, see BOM; read from the layout by eye |
| Tone | ? | ? | Potentiometer | value not given, see BOM; read from the layout by eye |
| Volume | ? | ? | Potentiometer | value not given, see BOM; read from the layout by eye |
| Switches 1 | ||||
| Tone Switch | SPST | SPST | HP/LP toggle; read from the layout by eye | |
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