Re: mxr phase 90 schematics. « Reply #17 on: August 13, 2010, 06:17:36 PM » I got it fixed! Thanks, I don't know if I would have ever got this working if you hadn't written that 'walk thru' I ended have having a faulty trim pot.
The GEO-Fex collection of vintage and new-design effects and musical related DIY.
- MXR Phase 90 Circuit. The MXR Phase 90 schematic can be broken down into 5 simpler blocks: Power Supply Stage, Input Buffer, Phase Shifting Stage, LFO and Output Mixer Stage. The circuit is designed around a Phase Shifting Stage with an Input Buffer to avoid tone sucking.
- MXR Diagrams, Schematics and Service Manuals - download for free! Including: mxr distortion pedal schematic, mxr dist plus schematic, mxr dynacomp compressor schematic, mxr envelope filter pedal schematic, mxr flanger pedal schematic, mxr flanger schematic, mxr hottube distortion schematic, mxr m 102 dyna comp pedal schematic, mxr m 104 distortion pedal schematic, mxr m 107 phase 100 pedal.
- The MXR 102 Dyna Comp is a compressor effect guitar pedal, released in 1972 by MXR and rapidly becoming popular because of its price and ease of use. The electronic circuit was also used as a reference design on many other compressor effects like the Ross Compressor, T-Rex CompNova, Ibanez/Maxon CP5/CP9/CP10 and boutique pedals.
Mxr Phase 90 Circuit Diagram
A short history of effects schematics on the world wide web.
New Effects | Notes on this effect |
MOS Doubler(GEO) | A cleaner sounding version of an octave up, uses CMOS Logic IC. Much less distortion than full wave rectifier based octave designs. New design from R.G. |
A transformer isolated signal splitter that enables hum-free connection of one guitar to more than one amp as well as having a direct output. The circuit is buffered to avoid signal loss. | |
An update/extension of the Phase 90 with extra stages and controls for the experimenter. | |
The MXR Phase 90, plus extension to eight stages. | |
A circuit which can match JFETs for Vgs at a 'typical' current, which produces good results for JFET-type phasers like the Phase 90. | |
DIY Bias Probe | |
Transformer Short Tester | |
Stomp Switch wiring |
Mxr Phase 90 Script Schematic
[What's a Toner Transfer Package?] [What's an RTS Printed Circuit Board?] [What's in a board parts kit?]
Manufacturer /Effect | Notes on this effect | DIY parts/PCB/Toner Available from GEO |
Ampeg | ||
Scrambler | An early distortion/octave device | |
| Apollo | ||
| Treble-Bass Booster | Very like the Orange and Dallas Rangemaster boosters. | |
Armstrong (Dan) | ||
A plug-in-the-guitar compressor | ||
Dallas/Dallas Arbiter | ||
Rangemaster | A single germanium transistor treble/signal booster to overdrive a tube input. Very sweet sound | |
Fuzz Face(Guitar Related Circuits) | The distortion legend. | PNP germanium transistors, including original types. Also BC109C silicons for duping the later ones. |
Bionics | ||
Schematic donated by Gustave Smalley as a hand drawing. I have not looked inside an Expandora to check it. | ||
Boss | ||
BF-2 Flanger(Justin Philpott's Site) | ||
Slow Gear Attack Delay(Guitar Related Circuits) | Originally drawn by R.G. | |
TM-3 Speaker Simulator1 and 2 (Stellan's Schematics) | ||
| Brian May's Treble Booster | A contribution from Stan Cotey. This is reputed to be a tracing of the Real Thing. | |
Carlin | ||
Compressor(Stellan's Schematics) | ||
Phasor(Stellan's Schematics) | ||
Colorsound (Sola Sound) | ||
Fuzz(Stellan's Schematics) | The fuzz half of the CS Wah-Fuzz; a silicon NPN circuit very like the Fuzz Face. | |
Overdriver(Aron Nelson's Page). | Ranges from simple overdrive of a tube amp input to massive gain/distortion on its own. Includes active tone for more detailed control of overdrive. | |
Jumbo Tone Bender(Aron Nelson's Page) | A simplified (earlier?) version of the Big Muff. Can be built on the same PCB by leaving off parts if you're skilled | |
The original Yard-Birds era fuzz tone. NOT like any of the later 'tone bender' named pedals. | Original Germanium transistors, Toner transfer package | |
Craig Anderton | ||
Octave-Doubling Fuzz(Justin Philpott's Site) | ||
Tremolo(Justin Philpott's Site) | ||
Tube Sound Fuzz(Justin Philpott's Site) | Very sweet sounding distortion built with CMOS logic IC's. | |
Better control with added filter and driver. | ||
Dan Armstrong | ||
Blue Clipper(Guitar Related Circuits) | Originally drawn by R.G. | |
Green Ringer | The unmarked transistor is a dual diode. Two discrete diodes work as well. Corrected by R.G. | |
Green Ringer(Guitar Related Circuits) | Originally drawn by R.G., bugs and all! | |
DOD | ||
DOD Phasor 201(Justin Philpott's Site) | ||
Compressor 280A(Guitar Related Circuits) | ||
Envelope Filter 440(Guitar Related Circuits) | ||
FX75 Flanger(Guitar Related Circuits) | ||
Overdrive 250(Guitar Related Circuits) | ||
Compressor/Limiter 525(Aron Nelson's Page). | ||
Wah/Filter 545(Aron Nelson's Page). | ||
Chorus 565(Aron Nelson's Page). | ||
Analog Delay 585(Aron Nelson's Page). | ||
Phasor 595(Aron Nelson's Page). | ||
Compressor 825(Aron Nelson's Page). | ||
EQ Circuits | ||
4bandeq.ps.Z(Guitar Related Circuits) | ||
Signal Brightener(Guitar Related Circuits) | ||
10 Band EQ(Guitar Related Circuits) | ||
Tone Booster(Guitar Related Circuits) | ||
Tone Control Circuits(Guitar Related Circuits) | ||
StudioMaster EQ(Stellan's Schematics) | ||
Electro-Harmonix | ||
| Axis / Guild Foxey Lady 2-knob | ||
Badstone(Aron Nelson's Page). | ||
Big Muff Op-amp version(Justin Philpott's Site) | ||
Big Muff (Transistor)(Guitar Related Circuits) | ||
Big Muff PNP version. (Stellan's Schematics) | European version with BC239 PNP transistors. Can be built on the same PCB as the regular Big Muff, if you're skilled. | Toner package, PCB |
Doctor Q(Aron Nelson's Page). | ||
Deluxe Memory Man(Stellan's Schematics) | ||
Electric Mistress(Stellan's Schematics) | ||
Hot Tubes(Guitar Related Circuits) | CMOS IC powered Soft Distortion | |
LBP and other Boosters(Guitar Related Circuits) | Originally drawn by R.G. | |
Fuzz Wah(Guitar Related Circuits) | Originally drawn by R.G. | |
Little Big Muff(Guitar Related Circuits) | Originally drawn by R.G. | |
Memory Man(Stellan's Schematics) | ||
Muff Fuzz(Guitar Related Circuits) | Originally drawn by R.G. | |
Pulsar tremolo | A very simple yet effective opamp/transistor tremolo, uses 741 opamp and 2N5088 xstrs | |
Small Stone(Guitar Related Circuits) | Originally drawn by R.G. | |
Soul Preacher(Guitar Related Circuits) | Originally drawn by R.G. | |
Zipper(Stellan's Schematics) | ||
Fender | ||
Fender Blender(Guitar Related Circuits) | Originally drawn by R.G. | Toner transfer package |
Blender(GEO) | Toner transfer package | |
Foxx | ||
Foxx Tone Machine(Justin Philpott's Site) | Toner transfer package, PCB | |
Toner transfer package, PCB | ||
Gus Smalley's hand tuned FX | Gus has hand picked values of components for good sound on these effects | |
GCS Fuzz F.(Justin Philpott's Site) | Can be built on the GEO FF Fuzz toner/PCB | |
GCS JH2 Fuzz Mod.(Justin Philpott's Site) | Can be built on the GEO FF Fuzz toner/PCB | |
GCS Overdrive(Justin Philpott's Site) | ||
GCS Ritefuzz(Justin Philpott's Site) | ||
Gretsch | ||
Contro-Fuzz(Aron Nelson's Page). | ||
Ibanez | ||
Fat Cat(Stellan's Schematics) | ||
SD-9 Sonic Distortion (coming soon) | MXR Distortion + style circuit with Ibanez' JFET bypass switching | |
Tube Screamer TS-808/9/10/5 | The technology of the Tube Screamer. Detailed info on what makes the screamer and its clones tick. Ibanez Tube Screamers : What's the deal? (aNaLoG.MaN) Frank Clarke'sScreamtendo 64 mod for the TS. | |
Jordan | ||
Bosstone | A two-transistor fuzz. Not subtle. | |
Bosstone - original schematic (Aron Nelson's Page). | May contain errors. | |
Bosstone(Guitar Related Circuits) | May contain errors. | |
Kay | ||
Fuzztone Model F-1(Aron Nelson's Page). | ||
Korg | ||
Octave(Aron Nelson's Page). | ||
Parametric EQ(Aron Nelson's Page). | ||
Phasor(Aron Nelson's Page). | ||
Tone Booster(Aron Nelson's Page). | ||
Maestro | ||
Boomerang(Guitar Related Circuits) | Originally drawn by R.G. | |
Brass-Master BB-1(Justin Philpott's Site) | ||
Legendary compressor from MXR. Rumor has it that this was the basis for Roger McGuin's sound. | ||
The original fuzz used on 'Satisfaction'! Two slightly different versions, the FZ1 and the FZ1A . | ||
Ring Modulator(Justin Philpott's Site) | ||
Fuzz(Guitar Related Circuits) | Originally drawn by R.G. | |
Morley | ||
Power/Wah/Boost(Aron Nelson's Page). | ||
Mosrite | ||
Fuzz-Rite(Guitar Related Circuits) | Originally drawn by R.G. | |
Mutron | ||
Mutron III(CJLectronics) | ||
MXR | ||
Bluebox(CJLectronics) | ||
The stompbox compressor the rest are compared to | ||
| D-Comp versus R-Comp | See how close they are. | |
Distortion+(Aron Nelson's Page). | ||
Distortion+(Guitar Related Circuits) | Originally drawn by R.G. | |
Distortion II(Aron Nelson's Page). | ||
Flanger(Stellan's Schematics) | ||
Hot Tubes(Guitar Related Circuits) | Originally drawn by R.G. - however it's really an EH, not an MXR - I was confused, OK?? | |
Micro Amp(CJLectronics) | ||
Phase 45(Justin Philpott's Site) | ||
Phase 45/DOD Phasor 201(Justin Philpott's Site) | ||
An update/extension of the fab Phase 90 | ||
Oberheim | ||
Ring ModulatorTrimmer Docs(Aron Nelson's Page). | ||
Phaser PS-1(Guitar Related Circuits) | Originally drawn by R.G. | |
| Orange | ||
| Orange Treble/Bass Booster | ||
Prescription Electronic | ||
The Experience Pedal(Justin Philpott's Site) | ||
Pro Co | ||
The Rat(Swap site for Guitar PCBs) | ||
The Rat(Guitar Related Circuits) | May contain errors. | |
The Rat type B(Guitar Related Circuits) (Aron Nelson's Page). | May contain errors. | |
R.G. Keen | ||
MOS Doubler(GEO) | A cleaner sounding version of an octave up, uses CMOS Logic IC. New design from R.G. | |
Roger Mayer | ||
Axis Fuzz(Justin Philpott's Site) | ||
Classic Fuzz(Justin Philpott's Site) | ||
Octavia(Justin Philpott's Site) | ||
Voodoo-1(Justin Philpott's Site) | ||
Roland | ||
Ross | ||
| Ross Compressor | Can be built on the GEO D&R Comp RTS circuit board | |
| Sam Ash | ||
| Sam Ash Fuzz | ||
| Seamoon | ||
| Seamoon Funk Machine | ||
| Tycobrahe | ||
Octavia(Justin Philpott's Site) | Can be built on the PCB /toner from GEO | |
Octavia | ||
Univox | ||
Super-Fuzz(Justin Philpott's Site) | Can be built on the PCB /toner from GEO | Toner transfer package |
Super Fuzz (GEO) | ||
Voodoo Labs | ||
Overdrive(Justin Philpott's Site) | ||
Vox | ||
Tone Bender(Guitar Related Circuits) | Originally drawn by R.G. Can be built on the FF Fuzz board from GEO | |
Treble Booster(Guitar Related Circuits) | Originally drawn by R.G. | |
Wah Circuits | ||
Crybaby(Justin Philpott's Site) | ||
Crybaby - Jim Dunlop(Justin Philpott's Site) | ||
Vox V847 Wah(Justin Philpott's Site) | ||
Unicord | ||
Super Fuzz(Guitar Related Circuits) | Originally drawn by R.G. | |
Super Fuzz(GEO) | ||
Univibe | ||
Univibe(Guitar Related Circuits) | Originally drawn by R.G. | |
Univibe(GEO) | See 'The Technology of the Univibe' for an in-depth look at how it works. | |
Univox | ||
Square Wave FuzzBrad Fajardo | ||
Square Wave PCB component placement.Brad Fajardo | ||
Westbury | ||
Misellaneous | ||
Fuzzstain (Stellan's Schematics) | ||
Lead Fuzz(Stellan's Schematics) | ||
Sweet Feets Distortion (Stellan's Schematics) | ||
Fuzzbox(Stellan's Schematics) | ||
Equalizer Fuzz (Stellan's Schematics) | ||
Differential Distortion(Stellan's Schematics) | ||
Modified Differential Distortion(Justin Philpott's Site) | ||
Electra Distortion(Justin Philpott's Site) | ||
Angry Beard 3(Guitar Related Circuits) | ||
fuzz001.gif(Guitar Related Circuits) | ||
fuzz002.gif(Guitar Related Circuits) | ||
jshfuzz.gif(Guitar Related Circuits) | ||
olsonns.gif(Guitar Related Circuits) | ||
tubedist.gif(Guitar Related Circuits) | ||
Generic Overdrive and Distortion schematic. (GM Arts) | ||
Smooth Fuzz(Analog Modular Synthesizers) | ||
Fuzz Box(Analog Modular Synthesizers) |