Mxr Phase 90 Schematic

Vintage Mxr Phase 90 Schematic
Mxr Phase 90 Script Schematic
Evh Mxr Phase 90 Schematic

Description

From looking at the schematic there’s no gain stage that can quickly and easily be upped, but what you could do is add an extra opamp or transistor stage at the end with moderate/adjustable gain. Another possibility is to experiment with the gain in the phaser stages (like slightly increasing R3, R8, R13 and R20), but that might also end up. This is the original MXR™ Phase 90™ Phase Shifter (script logo) Replica known as P90. This is a classic phase shifter. We chose to use this layout since the 741 ICs seem to be part of the “magic” sound of the old Script Logo version. The layout is very similar to the original MXR layout.

The Phase 90 takes you from subtle, spatial shimmer to all-out high velocity swooshing with the twist of a knob.

This pedal can be powered by a 9-volt battery, a Dunlop ECB003 9-volt adapter, or the DC Brick™, Iso-Brick™, and Mini Iso-Brick™ power supplies (not included).

Warranty Information

Vintage Mxr Phase 90 Schematic

The Long Story

Mxr Phase 90 Script Schematic

For more than four decades, the MXR Phase 90 has been a mainstay on the pedal boards of millions of players around the globe. This little orange box went on to become the sole icon of its effect category, and countless legendary riffs have benefitted from the sonic qualities of this pedal. No matter the genre or instrument, the Phase 90 has been there through it all to add its distinctly lush voice to a musician’s tone palette. With the twist of the Rate knob, you can take the Phase 90’s warm modulation from subtle, spatial shimmer to all-out high velocity swooshing.