125B · 5 knobs
Keeley Mag EchoVerified
Based on the Keeley Mag Echo
From the post
Here's Keeley's PT2399-based delay that aims to emulate old tape delays. I think it's the first delay on the blog with built in modulation. It's laid out with board mounted pots for a 125B enclosure with top mounted jacks. FYI, the trimmer controls the gain of the input stage.
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 34 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 10K count (9) is high: three in the row under the PT2399 beside the 15K and two just right of them, one each at rows K, N, O, Q and one vertical under the Level pads; several are packed tightly
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×9 | 10K | 10k | read from the layout by eye | |
| ×4 | 4.7K | 4.7k | read from the layout by eye | |
| ×3 | 1K | 1k | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×3 | 220K | 220k | read from the layout by eye | |
| ×3 | 47K | 47k | read from the layout by eye | |
| ×2 | 120K | 120k | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×1 | 12K | 12k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 11 | ||||
| ×5 | 100nF | 100n | four film, one ceramic; read from the layout by eye | |
| ×1 | 330nF | 330n | read from the layout by eye | |
| ×2 | 2.2nF | 2.2n | read from the layout by eye | |
| ×2 | 22nF | 22n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×5 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×2 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | 1N4148 | 1N4148 | 1N4148; read from the layout by eye | |
| ×1 | 1N5817 | 1N5817 | 1N5817; read from the layout by eye | |
| ICs 4 | ||||
| ×1 | PT2399 | PT2399 | read from the layout by eye | |
| ×1 | LM358N | LM358N | read from the layout by eye | |
| ×1 | OPA2134 | OPA2134 | read from the layout by eye | |
| ×1 | 7805 | 7805 | regulator; marked O G I on the board, 7805 in the wiring diagram; read from the layout by eye | |
| Potentiometers 5 | ||||
| Time | B50k | B50k | Potentiometer | read from the layout by eye |
| Speed | B50k | B50k | Potentiometer | read from the layout by eye |
| Depth | B100k | B100k | Potentiometer | read from the layout by eye |
| Feedback | A100k | A100k | Potentiometer | read from the layout by eye |
| Level | B100k | B100k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×1 | 100K | 100k | read from the layout by eye | |
| LEDs 1 | ||||
| Rate | LED | LED | off-board rate indicator; read from the layout by eye | |