Here is a list of the schematics that are exclusive to this site. We created several and we have redrawn some schematics that were already available on the internet  for readability or ease of use (these needed an easier-to-read format, corrections or part identifiers).  Many of these schematics include “modernization” that are included and explained in the “Project” for the given schematic.  You may freely post links to any of the pages or files on this site, but please do not put copies of these files on your site. We frequently update our files.  If you want to see photos of the original units of any of these guitar effects see our  “Originals” board on Pintrest  Note: All Trademarks mentioned here belong to their owners and not to General Guitar Gadgets



Klon Centaur Schematic and Project, Kit and PCB in the DISTORTION section.  384 Amp Sehcmatic PCB and Kit in the AMP section!

  (June 29, 2020)





Amplifiers & Headphone Amps

LM384 5 watt Amp  Kit  PCB Project
“Smokey” Type Amp (386 IC)   PCB  Project
MXR Headphone Amp   PCB Project


Adamu Bass Distortion  Kit  PCB Project
ColorSound Bass Fuzz  Kit  PCB Project
Deluge Bass Distortion  Kit  PCB Project
Electro-Harmonix Hog’s Foot    PCB  Project
Ibanez BP10 Bass Compressor
Ibanez BP10 Bass Compressor (modernized and simplified)
Kit PCB Project
Krampus Bass Overdrive  Kit  PCB Project
 Maestro Brass Master  Kit PCB Project

Boosters and Volume (Including Tone Boosters)

Alembic StratoBlaster
Alembic StratoBlaster (Modernized)
Kit  PCB  Project
Apollo Tone Booster See Orange Tone Booster below    
Dallas Arbiter Rangemaster Kit  PCB Project
Dan Armstrong Red Ranger 
Dan Armstrong Red Ranger Modernized Version
DeArmond Volume Pedal      
Electro-Harmonix LPB1 & LPB2 Kit  PCB  Project
MXR™ Micro Amp Kit  PCB  Project
Pad Box (passive volume)      Project
Orange Tone Booster
Orange Tone Booster (NPN Transistor)
Kit  PCB Project


ColorSound SupaSustain     Project
Dan Armstrong Orange Squeezer Compressor  Kit PCB Project
DOD 280A Compressor
DOD 280A Compressor with modifications
DOD 280 Compressor 
Ibanez CP10 Compressor
Ibanez CP10 Compressor (modernized and simplified)
Kit PCB Project
MXR Dynacomp Compressor   PCB  Project
Ross Compressor   PCB Project

Direct to Console/PA

Direct Box – Active     Project
Direct Box – Active with Transformer Isolation     Project Coming Soon
Direct Box – Simple Passive Direct Box      
Direct Box – Simple Passive Direct Box with Jensen JT-DB-E Transformer      
Direct Box – Passive Direct Box, Jensen JT-DB-E Transformer, with extras      


Boss OD-1  PCB  Project
Boss SD-1  PCB  Project
Brown-Sound-In-A-Box II Kit     Project
DOD Overdrive 250 Kit PCB Project
Electro Harmonix Big Muff – Green Russian
Electro Harmonix Big Muff – General Guitar Gadgets Version
Electro Harmonix Big Muff – Late 70’s (3rd) Version
Electro Harmonix Big Muff – Ram’s Head
Electro Harmonix Big Muff – Triangle
Electro Harmonix Big Muff – Violet Ram’s Head
Kit PCB  Project
Electro Harmonix Big Muff – 80’s with Tone control bypass      
Electro Harmonix Muff Fuzz (transistor)   PCB Project
Gus’ IC Muff Fuzz Mods 1      
Gus’ IC Muff Fuzz Mods 2      
Fulltone Fulldrive 1      
Fulltone Fulldrive 2      
Guild Foxey Lady (3 knob)   PCB  Project
Ibanez Sonic Distortion (SD-9) Kit PCB Project
Ibanez Sonic Distortion (SD-9) with mods      
Ibanez TS-808 with True Bypass  Kit  PCB  Project
Ibanez TS-808 Original      
Klon Centaur (Original Wiring)
Klon Centaur (True Bypass Wiring)
Kit  PCB  Project
Marshall BluesBreaker (Original Wiring)
Marshall BluesBreaker (True Bypass Wiring)
Kit  PCB  Project
Marshall The Guv’nor (Original Wiring)
Marshall The Guv’nor (with Modern Improvements)
Kit PCB Project
OC Dist Kit PCB Project
ProCo Rat Replica (Rodent)  Kit PCB  Project
MXR Distortion +  Kit PCB  Project
Red Fuzz Distortion   Kit PCB  Project
Ross Distortion   Kit PCB  Project
Roland Bee Baa Distortion/Booster   Kit PCB  Project

Filters, etc.

Bi-Filter Follower (Craig Anderton’s)
Bi-Filter Follower (Craig Anderton’s) with modifications by Mark Hammer
DOD 440 Envelope Filter      Project
Heil Sound – The Talk Box     Project
Maestro Envelope Modifier      
Maestro Filter – Sample and Hold FSH-1
Maestro Filter – Sample and Hold FSH-1 (Modernized)
Maestro Filter – Sample and Hold FSH-1 (with Modifications)
Musitronic Mutron III Envelope Filter   PCB Project
Musitronic Micro V Envelope Filter Kit PCB Project
MXR Envelope Filter
MXR Envelope Filter with modifications

Fuzz Tones

ColorSound JumboTone Bender   PCB  Project
ColorSound Supa ToneBender   PCB Project
ETI 1 Transistor Fuzz Pedal      
Easy Face (Joe Gagan’s) with input cap switch      
Dallas Arbiter Fuzz Face (Germanium)
Fuzz Face Silicon Version
Easy Face (Joe Gagan’s)
Fulltone ’69 
Fulltone ’69 (NPN)
Fulltone ’70
Kit PCB Project
Jordan BossTone Kit PCB Project
Maestro Super Fuzztone FZ-1S
Maestro Super Fuzztone FZ-1S (with True Bypass)
3 Transistor Fuzz (Gus Smalley’s)      
Shin Ei Companion Fuzz Kit PCB Project
SolaSound ToneBenders See ColorSound ToneBenders below    
ToneBender Mark II Professional (ColorSound)
ToneBender Mark II Professional (Color Sound) NPN version
ToneBender Mark II Professional (ColorSound) Silicon Transistor Version
Kit PCB Project
ToneBender III (ColorSound)
ToneBender III (Fulltone Soul Bender)
ToneBender III (Prescription Electronics Yard Box)
Kit PCB Project
Vox ToneBenders See ColorSound ToneBenders Above    

Modulation, Echo, etc.

AD3208 Analog Echo Unit     Project
Ibanez CS9 Chorus      
Echo Unit (Dean Hazelwanter)      
EXH Deluxe Electric Mistress (SAD1024 Version)Schematic
EXH Deluxe Electric Mistress (SAD1024 Version) Layout Details
PT80 Echo Unit Kit PCB Project

Octave Effects

Ampeg Scrambler
Ampeg Scrambler (Modernized)
Ampeg Scrambler (Modernized, 3 knob, added Volume Control)
Kit PCB Project
Dan Armstrong Green Ringer Kit PCB Project
fOXX Tone Machine Kit PCB Project
Octave Up Sick Box (Gus Smalley’s)      
Simple Octave Up (Gus Smalley’s)      
Ty* Octav*
Ty* Octav* (with Modern Improvements)
Kit PCB Project

Phase Shifters

Electro-Harmonix Bad Stone  Mark II       
MXR Phase 45 Kit PCB Project
MXR Phase 90 Kit  PCB Project
MXR Phase 100     Project


Regulated Power Supply   PCB Project


Digital Reverb  Kit PCB Project
Stage Center Reverb Schematic (Craig Anderton’s)
Spring Reverb Schematic (Improved Stage Center Reverb)

Switchers & Routers

A/B Switch Box   Kit    Project
A/B/Y Switch Box (Older Morley)
A/B/Y Switch Box (3 LED Indicator)
A/B/Y Switch Box (Grounded-off A/B)
Kit    Project
Effects Loop Switch Box Kit    Project
Effects Loop (Dual) Switch Box
Effects Loop Toggle Switch Box
Effects Loop Toggle Switch Box (with Bybass Switch)
Kit    Project
Effects Order Switch Box
Effects Order Switch Box (with LED indicators)
Kit    Project
Buffer     PCB Project
Dual Buffer   PCB  Project
DOD 270 A/B Switchbox      
Micro Mixer     PCB  Project
Mini Mixer   Kit  PCB  Project
Speaker Switch Box      Project
Translocator Switch Box  Kit    Project

Tone Controllers/Boosters

Six Band Graphic EQ     Project


Craig Anderton Tremolo
Craig Anderton Tremolo (Moderized)
Craig Anderton Tremolo – Stereo adaptation      
Original EA Tremolo (from Electronic Australia Magazine)
Improved EA Tremolo
Kay Tremolo    

Wah Wah

Ibanez WH-10 Wah      
Vox 847 Wah Wah    


GEO Alternating LED Indicator Circuit      
LXH2-Lite – Fender™Type Speaker Cabinet Simulator      

 Boss Factory Schematics

Thanks to Kate Ebneter for scanning and making these available.