1590B · 3 knobs
Fulltone OCD V2Verified
Based on the Fulltone OCD V2
From the post
The latest iteration of the OCD has quite a few differences from the earlier models. There's an added transistor stage at the output after the volume control, and a JFET buffer that can be toggled for buffered or true bypass. I've laid it out so it will still fit in a 1590B with board mounted pots.
The off-board wiring's not the most intuitive, so here's a diagram for wiring up the buffer switch and 3PDT bypass footswitch.
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 35 rows
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Check before you build · 1 value the reader of this layout was not sure of
- Which transistor outline is Q1..Q5 is taken from the wiring diagram labels; types per the legend (Q1-2 2N5457, Q3-4 2N7000, Q5 2SC1815)
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 14 | ||||
| ×11 | 10K | 10k | read from the layout by eye | |
| ×3 | 1K | 1k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×2 | 27K | 27k | read from the layout by eye | |
| ×2 | 47K | 47k | read from the layout by eye | |
| ×2 | 100Ω | 100 | read from the layout by eye | |
| ×1 | 3.3K | 3.3k | read from the layout by eye | |
| ×1 | 18K | 18k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 27Ω | 27 | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| ×1 | 39K | 39k | read from the layout by eye | |
| ×1 | 510K | 510k | read from the layout by eye | |
| Capacitors 8 | ||||
| ×2 | 220pF | 220p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×3 | 22nF | 22n | read from the layout by eye | |
| ×3 | 100nF | 100n | read from the layout by eye | |
| ×3 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 220uF | 220u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×1 | 1N5817 | 1N5817 | read from the layout by eye | |
| ×1 | 1N4739 | 1N4739 / 9V1 | printed 4739; zener; read from the layout by eye | |
| Transistors 5 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| Q2 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| Q3 | 2N7000 | 2N7000 | MOSFET; read from the layout by eye | |
| Q4 | 2N7000 | 2N7000 | MOSFET; read from the layout by eye | |
| Q5 | 2SC1815 | 2SC1815 | read from the layout by eye | |
| ICs 1 | ||||
| IC1 | TL082 | TL082 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Drive | A1M | A1M | Potentiometer | read from the layout by eye |
| Tone | B10K | B10k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Switches 2 | ||||
| Buff | DPDT on/on | DPDT ON/ON | buffer switch; read from the layout by eye | |
| HP/LP | SPST | SPST | read from the layout by eye | |