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New Effects |
Notes on this effect |
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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. |
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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. |
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An update/extension of the Phase 90 with extra stages and controls for the experimenter. |
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The MXR Phase 90, plus extension to eight stages. |
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A circuit which can match JFETs for Vgs at a "typical" current, which produces good results for JFET-type phasers like the Phase 90. |
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Pedalboard Power Supply with adjustable Old Battery settings |
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DIY Bias Probe |
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Transformer Short Tester |
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Stomp Switch wiring |
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[What's a Toner Transfer Package?] [What's an RTS Printed Circuit Board?] [What's in a board parts kit?]
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Manufacturer /Effect |
Notes on this effect |
DIY parts/PCB/Toner Available from GEO |
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Ampeg |
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Scrambler |
An early distortion/octave device |
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| Treble-Bass Booster | Very like the Orange and Dallas Rangemaster boosters. | |
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Armstrong (Dan) |
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A plug-in-the-guitar compressor |
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Dallas/Dallas Arbiter |
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A single germanium transistor treble/signal booster to overdrive a tube input. Very sweet sound Technical description of the Dallas Rangemaster and how to build it. |
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The distortion legend. |
PNP germanium transistors, including original types. Also BC109C silicons for duping the later ones. |
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Bionics |
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Schematic donated by Gustave Smalley as a hand drawing. I have not looked inside an Expandora to check it. |
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Boss |
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Originally drawn by R.G. |
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| Brian May's Treble Booster | A contribution from Stan Cotey. This is reputed to be a tracing of the Real Thing. | |
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Carlin |
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Colorsound (Sola Sound) |
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The fuzz half of the CS Wah-Fuzz; a silicon NPN circuit very like the Fuzz Face. |
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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. |
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A simplified (earlier?) version of the Big Muff. Can be built on the same PCB by leaving off parts if you're skilled |
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The original Yard-Birds era fuzz tone. NOT like any of the later "tone bender" named pedals. |
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Craig Anderton |
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Very sweet sounding distortion built with CMOS logic IC's. |
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Better control with added filter and driver. |
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Dan Armstrong |
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Originally drawn by R.G. |
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The unmarked transistor is a dual diode. Two discrete diodes work as well. Corrected by R.G. |
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Originally drawn by R.G., bugs and all! |
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DOD |
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EQ Circuits |
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Electro-Harmonix |
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Axis / Guild Foxey Lady 2-knob |
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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 |
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CMOS IC powered Soft Distortion |
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Originally drawn by R.G. |
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Originally drawn by R.G. |
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Originally drawn by R.G. |
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Originally drawn by R.G. |
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Pulsar tremolo |
A very simple yet effective opamp/transistor tremolo, uses 741 opamp and 2N5088 xstrs |
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Originally drawn by R.G. |
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Originally drawn by R.G. |
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Fender |
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Originally drawn by R.G. |
Toner transfer package PCB, Board kit |
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Foxx |
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Toner transfer package, PCB |
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Gus Smalley's hand tuned FX |
Gus has hand picked values of components for good sound on these effects |
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Can be built on the GEO FF Fuzz toner/PCB |
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Can be built on the GEO FF Fuzz toner/PCB |
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Gretsch |
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Ibanez |
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SD-9 Sonic Distortion (coming soon) |
MXR Distortion + style circuit with Ibanez' JFET bypass switching |
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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) Ibanez Tube Screamer Hotrod Page. Frank Clarke's Screamtendo 64 mod for the TS. |
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Jordan |
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A two-transistor fuzz. Not subtle. |
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Bosstone - original schematic (Aron Nelson's Page). |
May contain errors. |
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May contain errors. |
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Kay |
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Korg |
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Maestro |
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Originally drawn by R.G. |
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Legendary compressor from MXR. Rumor has it that this was the basis for Roger McGuin's sound. |
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The original fuzz used on "Satisfaction"! Two slightly different versions, the FZ1 and the FZ1A . |
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Originally drawn by R.G. |
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Morley |
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Mosrite |
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Originally drawn by R.G. |
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Mutron |
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MXR |
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The stompbox compressor the rest are compared to |
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| D-Comp versus R-Comp | See how close they are. | |
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Originally drawn by R.G. |
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Originally drawn by R.G. - however it's really an EH, not an MXR - I was confused, OK?? |
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An update/extension of the fab Phase 90 |
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Oberheim |
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Originally drawn by R.G. |
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| Orange | ||
| Orange Treble/Bass Booster | ||
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Prescription Electronic |
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Pro Co |
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The Rat (Swap site for Guitar PCBs) |
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May contain errors. |
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The Rat type B (Guitar Related Circuits) (Aron Nelson's Page). |
May contain errors. |
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R.G. Keen |
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A cleaner sounding version of an octave up, uses CMOS Logic IC. New design from R.G. |
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Roger Mayer |
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Roland |
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Ross |
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| Ross Compressor | Can be built on the GEO D&R Comp RTS circuit board | |
| Sam Ash | ||
| Sam Ash Fuzz | ||
| Seamoon | ||
| Seamoon Funk Machine | ||
| Tycobrahe | ||
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Can be built on the PCB /toner from GEO |
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Univox |
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Can be built on the PCB /toner from GEO |
Toner transfer package PCB |
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Voodoo Labs |
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Vox |
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Originally drawn by R.G. Can be built on the FF Fuzz board from GEO |
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Originally drawn by R.G. |
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Wah Circuits |
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Unicord |
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Originally drawn by R.G. |
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Univibe |
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Originally drawn by R.G. |
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See "The Technology of the Univibe" for an in-depth look at how it works. |
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Univox |
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Westbury |
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Misellaneous |
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