There aren't any schematics online for the dunlop/mxr phase 90? Try emailing dunlop/mxr and explain the problem and request a schematic. You never know, they might actually send it. MXR Phase 90 US$ 11.00. Possible mods: 'The resistor you pull to get rid of the feedback (and change the sweep) is the red 22k at the top of the schematic. Joyo JF-06 Vintage Phase: MXR Phase 90: Joyo JF-07 Classic Flanger: Ibanez FL-9 Flanger: Joyo JF-08 Delay: Boss DD-2 Delay: Joyo JF-09 Tremolo: Diaz Tremodillo: Joyo JF-10 Dynamic Compressor: MXR Dyna Comp: Joyo JF-11 6 Band EQ: MXR 6 Band EQ: Joyo JF-12 Voodoo Octave: Fulltone Ultimate Octave: Joyo JF-13 AC Tone: Tech 21 SansAmp Character. MXR M-101 Phase 90. MXR M-101 Phase 90 (Dunlop reissue) MXR Custom Shop CSP-001 Variphase Pedal (Phase 90 in wah housing) MXR Custom Shop CSP-026 Handwired 1974 Vintage Phase 90 (Dunlop reissue) MXR Custom Shop CSP-099 Phase 99 (dual Phase 90) MXR Custom Shop CSP-101S Script Phase 90 (Dunlop reissue). Re: mxr phase 90 schematics. « Reply #3 on: April 25, 2010, 01:15:14 AM » my problem is piecing the puzzle together.the missing piece is the proper schematic. There are so many out there, and there were so many phase 90 designs.
The MXR Phase 90, probably the most popular Phaser Pedal (especially since Eddie Van Halen used it). The Phase 90 is a JFET base Phaser circuit.It uses 4 JFETs which needs to be matched to get proper phasing. For my build ive used a Madbean NomNom PCB and a matched JFET Quartett from Musikding (2n5952)
You mach the JFETS by yourself too. Instructions for this are in the Madbean NomNom build doc.
All parts except the JFETs are very easy to obtain.
For my build ive used following mods, which are the original does not have:
- Rate LED (which is also used as bypass LED)
- Feedback switch (intesifies phasing, when on)
Schematic
Mxr Phase 90 Script Schematic
My Build
What Does A Mxr Phase 90 Do
