Enclosure not stated · 1 knob
MXR Phase 90 with Script SwitchVerified
Based on the MXR Phase 90· 14 other boards clone it
From the post
A few people have requested this so I thought I'd better do it. This one includes the Script mod on a switch so you can choose either mode. Don't forget that you really need to match the JFETs for this. You may get lucky with an unmatched set but the better the match the better the effect, so it's worth a bit of effort. Use something like a Peak DCA75 if you have one, or this simple build will also allow you to choose the 4 best matches.
Info about the original:
This device has found its way into many of Eddie Van Halen's recordings, adding a shimmery velocity to lead passages or a more dramatic swoosh to muted strumming. Not just for guitars; it works well with bass, keyboards and even vocals. Vary the speed from a subtle, long cycle to a fast, watery warble...and myriad vintage vibrations in between.
[Updated 21st May 2014 - re-jigged to make better use of space but all connections as per the original verified layout]
Modified version with added depth control. The Depth 1 wire needs to connect in the hole under the link, so it's probably advisable to raise that link slightly to give you room.
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 23 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 1 value the reader of this layout was not sure of
- 15u electrolytic bottom centre next to D1: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 8 | ||||
| ×10 | 10K | 10k | read from the layout by eye | |
| ×5 | 22K | 22k | read from the layout by eye | |
| ×6 | 150K | 150k | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 3M9 | 3.9M | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×1 | 4K7 | 4.7k | read from the layout by eye | |
| Capacitors 5 | ||||
| ×6 | 47n | 47n | read from the layout by eye | |
| ×2 | 10n | 10n | read from the layout by eye | |
| ×1 | 47u | 47u | electrolytic; read from the layout by eye | |
| ×1 | 10u | 10u | electrolytic; read from the layout by eye | |
| ×1 | 15u | 15u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 5V1 zener | 5V1 | read from the layout by eye | |
| Transistors 5 | ||||
| Q1 | 2N5952 | 2N5952 | JFET; read from the layout by eye | |
| Q2 | 2N5952 | 2N5952 | JFET; read from the layout by eye | |
| Q3 | 2N5952 | 2N5952 | JFET; read from the layout by eye | |
| Q4 | 2N5952 | 2N5952 | JFET; read from the layout by eye | |
| Q5 | 2N4125 | 2N4125 | read from the layout by eye | |
| ICs 1 | ||||
| ×3 | TL072 | TL072 | read from the layout by eye | |
| Potentiometers 1 | ||||
| Speed | C500K | C500k | Potentiometer | Reverse Log; read from the layout by eye |
| Trimmers 1 | ||||
| ×1 | 250K | 250k | read from the layout by eye | |
| Switches 1 | ||||
| Script | SPST | SPST | Script Switch, wires Sw1 / Sw2; read from the layout by eye | |
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