Mxr Phase 90 Schematic

Mxr Phase 90 Schematic
Mxr Phase 90 Schematic Pcb Layout
Mxr Phase 90 Schematic
Evh Mxr Phase 90 Schematic

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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. 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® PHASE 90 MXR® PHASE 90. 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).

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MXR Phase 90 -- ADVANCED

Description
Phase Shifter, JFET based

Status
VERIFIED

Layouts
tonepad_phase90.pdf 115.2 KB-- Pez 90, Rev.6.Sep.30.2007

Order Printed Circuit Boards

MXR Phase 90 US$ 11.00

Comments

A great-sounding phase shifter used by the likes of Eddie Van Halen ('Unchained') and many others.

You must use matched FETs for the circuit to work. The value of the zener diode depends on the FETs you use. Use sockets for these parts.

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. The resistor to change the level is the 150k which connects between the collector and base of the PNP transistor: 120k to reduce gain, 180k to increase it.' Rob Strand

For offboard wiring instructions check the offboard wiring project page.