Enclosure not stated · 5 knobs
Keeley Magnetic EchoVerified
Based on the Keeley Magnetic Echo· 5 other boards clone it
From the post
Original info:
"The Mag-Echo pedal simulates tube tape echo sounds by using the delay circuit and a little bit of modulation. Tape echos have long been regarded as a warm and very guitar friendly form of delay. The Mag-Echo achieves similar results by using a touch of Lo-Fi delay, a slightly filtered echo response to keep things warm, and some modulation. Modulation, or “Wow and Flutter” in the tape world is a slight pitch shift or wavering that occurs as the tape is pulled across the heads. The modulation we use is similar to what we use in our Seafoam Chorus, a slight wavering of pitch on the trails of the repeats. With a simple set of controls for the delay – Time, Regen, and Level and with the “Wow and Flutter” controls – Depth and Rate you can create some very vintage or rather unique tones"
PedalPCB's schematic, info and pcb available here.
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 35 rows
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Check before you build · 1 value the reader of this layout was not sure of
- Small image (880x527): all values read cleanly at 6x, none doubtful; the CLR resistors (x2) have no value printed
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×9 | 10K | 10k | read from the layout by eye | |
| ×3 | 47K | 47k | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×3 | 1K | 1k | read from the layout by eye | |
| ×3 | 220K | 220k | read from the layout by eye | |
| ×2 | 120K | 120k | read from the layout by eye | |
| ×2 | 4K7 | 4.7k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 12K | 12k | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×2 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 11 | ||||
| ×5 | 1u | 1u | electrolytic; read from the layout by eye | |
| ×2 | 47u | 47u | electrolytic; read from the layout by eye | |
| ×2 | 100u | 100u | electrolytic; read from the layout by eye | |
| ×1 | 4u7 | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 10u | 10u | electrolytic; read from the layout by eye | |
| ×4 | 100n | 100n | read from the layout by eye | |
| ×2 | 2n2 | 2.2n | read from the layout by eye | |
| ×2 | 22n | 22n | read from the layout by eye | |
| ×1 | 330n | 330n | read from the layout by eye | |
| ×1 | 47n | 47n | read from the layout by eye | |
| ×1 | 10n | 10n | read from the layout by eye | |
| Diodes 3 | ||||
| D1 | 1n4148 | 1N4148 | read from the layout by eye | |
| D2 | 1n4148 | 1N4148 | read from the layout by eye | |
| D3 | 1n5817 | 1N5817 | read from the layout by eye | |
| ICs 4 | ||||
| ×1 | 2134 | 2134 | as printed; OPA2134 dual op amp; read from the layout by eye | |
| ×1 | 2399 | 2399 | as printed; PT2399; read from the layout by eye | |
| ×1 | LM358 | LM358 | read from the layout by eye | |
| ×1 | 78L05 | 78L05 | regulator; read from the layout by eye | |
| Potentiometers 5 | ||||
| Depth | B100K | B100k | Potentiometer | read from the layout by eye |
| Level | B100K | B100k | Potentiometer | read from the layout by eye |
| Feedback | A100K | A100k | Potentiometer | read from the layout by eye |
| Speed | B50K | B50k | Potentiometer | read from the layout by eye |
| Time | B50K | B50k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| Gain | 100K | 100k | read from the layout by eye | |
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