Enclosure not stated · 3 knobs
Mad Professor Deep Blue DelayVerified
Based on the Mad Professor Deep Blue Delay· 12 other boards clone it
From the post
The Mad Professor Deep Blue Delay is regarded as one of the best PT2399 based delays out there (with the price tag to match that reputation). It's a warm and natural sounding circuit with an analog direct signal path (aka, no buffers), and plays nice with distortion boxes as well. I've labeled IC1 as a TL072 as it's what you most likely have in your parts drawer, but the originals have either OP275 or AD712 for what it's worth. Pots can be board-mounted from the solder side of the board using right angle PCB mount pots.
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 31 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×7 | 10K | 10k | read from the layout by eye | |
| ×2 | 20K | 20k | read from the layout by eye | |
| ×2 | 1K | 1k | read from the layout by eye | |
| ×1 | 2K | 2k | read from the layout by eye | |
| ×1 | 12K | 12k | read from the layout by eye | |
| ×1 | 5.1K | 5.1k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 180K | 180k | read from the layout by eye | |
| ×1 | 360K | 360k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 2.7K | 2.7k | read from the layout by eye | |
| ×1 | 33Ω | 33 | read from the layout by eye | |
| Capacitors 12 | ||||
| ×1 | 47pF | 47p | read from the layout by eye | |
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×2 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 4.7nF | 4.7n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×1 | 15nF | 15n | read from the layout by eye | |
| ×2 | 22nF | 22n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×4 | 100nF | 100n | read from the layout by eye | |
| ×4 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×3 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| ICs 3 | ||||
| ×1 | TL072P | TL072P | read from the layout by eye | |
| ×1 | PT2399 | PT2399 | read from the layout by eye | |
| ×1 | 7805 | 7805 | regulator; value from the wiring diagram, board shows only pins 3 2 1; read from the layout by eye | |
| Potentiometers 3 | ||||
| Feedback | B50K | B50k | Potentiometer | called Repeat in the wiring diagram; read from the layout by eye |
| Mix | B50K | B50k | Potentiometer | called Level in the wiring diagram; read from the layout by eye |
| Delay | B50K | B50k | Potentiometer | read from the layout by eye |
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