1590B · 1 knob
MXR Phase 45Verified
Based on the MXR Phase 45· 12 other boards clone it
From the post
I've seen a lot of different PCB layouts online for this effect, but all of them had at least one jumper on the board. Jumpers aren't the end of the world, but I know for me, if I'm going to go to all the trouble of etching a PCB, I don't want to mess with jumpers. This layout is jumper-free and will still fit in a 1590B type enclosure.
MXR released the Phase 45 along side the more famous Phase 90 in 1975. The name comes from the number of degrees of the phase shift it's capable of. Some say it's similar in sound to a UniVibe and can be modded into being more of a vibe pedal.
The original units used 2N5952 for the FETs (make sure you match them by the way), but others can be used. I listed 2N5457 in the layout because they're what I have on hand. MPF102, J201, or 2N5458s could also be used. Really, any FET with the DSG pinout.
If you want, you can hardwire the C500k pot to the top of the board, though I would suggest using a long leg PCB mount pot (like these) and mounting it above the component side of the board (like this).
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 18 rows
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Check before you build · 2 values the reader of this layout was not sure of
- two vertical resistors right of centre (columns N and O, rows K-N, above the lower TL072): the vero prints 10K and 10K, the PCB drawing of the same circuit prints 1.5K and 1.5K; vero reading kept, so 10K count is 13 (11 if those two are 1.5K)
- 20K next to the lower TL072: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×13 | 10K | 10k | read from the layout by eye | |
| ×5 | 150K | 150k | read from the layout by eye | |
| ×3 | 470K | 470k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 7.5K | 7.5k | read from the layout by eye | |
| ×1 | 20K | 20k | read from the layout by eye | |
| ×1 | 3.9M | 3.9M | read from the layout by eye | |
| Capacitors 4 | ||||
| ×4 | 10nF | 10n | read from the layout by eye | |
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×3 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| D1 | 4.7V Zener | 4V7 | read from the layout by eye | |
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| Q2 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| ICs 1 | ||||
| ×2 | TL072 | TL072 | read from the layout by eye | |
| Potentiometers 1 | ||||
| Speed | C500K | C500k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×1 | 250K | 250k | read from the layout by eye | |
Other boards based on the MXR Phase 45
- Apex Aion FX · 125B · $12.50
- MXR Phase 45 Dirtbox Layouts
- P45 Phaser Fuzz Dog · 1590B · £30.00
- MXR Phase 45 General Guitar Gadgets · $15.00
- Shift 45 HotKits · 1590B
- Smoothie Madbean · 1590B · $10.00
- Phase 45 OP Electronics · €1.50
- MXR Phase 45 with JC Maillet's Vibe mods Revolution Deux
- PH75 - p45 Sheepylove · €10.00
- MXR Phase 45 Tagboard Effects · 1590B
- MXR Phase 45 modded Tagboard Effects · 1590B
- MXR Phase 45 Tonepad · $11.00