Audio circuits

• 100W Guitar Amplifier Mk II
• 2 Note Ribbon Controller
• 25-pin PC serial port to MIDI synthesizer interface cable
• 3 Channel Color Organ
• 8 Note Tune Player
• 8 note tune player
• 9-pin PC serial port to MIDI synthesizer interface cable
• A refined Fuzz Face. Schematic and PCB layout.
• Amiga MIDI interface
• Ampeg SB-12 Portaflex adapted for use as a bass overdrive stompbox
• An ultra-flexible tonestack with clean boost. Schematic, photo, and PCB/perfboard layouts.
• Apple Mac to MIDI synthesizer interface cable
• Apple Macintosh MIDI interface schematic (basic version)
• Apple Macintosh MIDI interface schematic (deluxe version)
• B. Blender: Blends an effects chain with the input signal. Works well with bass guitar
• Bassline synthesizer/sequencer
• Big Muff Pi variant using Bazz Fuss as clipping stage. Schematic and and PCB/perfboard layouts.
• Boogie MkI adapted for use as a distortion stompbox
• CD4049 based distortion. Schematic, PCB/perfboard layout, and photos.
• Closer look at the FET booster based on a vintage Fender 12AX7 input stage.
• Colour (Sound) Organ
• Colour (Sound) Organ
• Compact DJ station
• Daisy MP3 player project
• Digital Guitar Tuner
• Distortion effects using an LM386 audio amplifier IC
• DIY Serial MIDI Interface (80C51/80C31 Version)
• Drawdio - A very simple musical synthesizer that uses the conductive properties of pencil graphite
• Drum percussion sensor schematics
• Drum Tone Oscillators
• Dual parallel buffered effect loops with blend control. Schematic and perfboard/PCB layouts
• Electronic metronome
• Faux-phaser circuit with LFO and manual (wah pedal) modes. Schematic and and PCB layout.
• Fender Princeton adapted for use as a distortion stompbox
• FET overdrive developed as a Tube Screamer alternative. Schematic and perfboard layout.
• Guitar Fuzz Effect
• Guitar fuzz effect
• Guitar Reverb Effect Version 2
• Guitar Reverb Pedal
• Guitar Reverb Pedal
• Guitar Tremolo Unit
• Guitar Vibrato Unit
• Homebuilt MP3 Player
• Improved Silicon Fuzz Face. Schematic, build notes, photo, and PCB/perfboard layouts.
• Infinite melody for music synthesizers
• Liquidator Tube Phaser/Chorus Effect
• Lossless portable digital audio player using the Microchip PIC32
• Marshall 100W Super Lead adapted for use as a distortion stompbox. Schematic and PCB layout.
• Marshall 18W adapted for use as a distortion stompbox
• Matchless DC/30 adapted for use as a distortion stompbox
• Metronome Circuit
• Microcontroller MIDI interface
• MIDI Controller Footpedal
• MIDI Drum Machine Analog Input Schematic
• MIDI drum machine project
• MIDI interface / cable tester
• MIDI keyboard circuit diagram
• MIDI merger schematic
• MIDI Pedalboard Encoder
• midi2cv8 to Drum Tone Board Connections
• Midibox 64
• Miniature metronome
• MP3 Player circuit schematic
• Mr Smooth is a clean boost to mild overdrive effect
• Mr. EQ - a simple, yet potent DIY equalizer
• Music player built on microcontroller AT91SAM7S256 with ARM core
• Musical Instrument (Expandable) Graphic Equaliser
• New clipper circuit diagram (based on TL071 opamp)
• Octave screamer
• Peppermill overdrive - A simple, transparent overdrive. Schematic and PCB/perfboard layouts.
• Percussion generator circuits
• Portable Mixer with high-quality modular design (9V battery powered)
• Portable MP3 music player
• Practical MS Decoder Circuit
• Real-world MIDI interface platform project including circuit diagram and PCB design files
• Schematic of a Rockman-like distortion. Schematic and PCB/perfboard layouts.
• Selection of solid state and tube guitar amplifier and effects circuits
• Serial MIDI interface
• Simple Colour Organ
• Simple colour organ
• Simple line mixer
• Simple metronome using LM1458
• Simple MIDI switcher
• Simple MIDI tester
• Simple open source MP3 player with SD/MMC memory card support
• Simple Transistor Organ
• Sound Effects Generator
• Sound Effects Generator 2
• Sound Lab Mini-Synth analog music synthesizer
• Spring reverb
• Spring reverb unit
• Spring Reverb Unit For Guitar
• Standard MIDI to MIDI interface cable diagram
• Supro 16T adapted for use as a distortion stompbox
• The 203 Theremin - A Battery-Operated Version of the Wien-Bridge Theremin
• Theremax Theramic Circuit Schematic
• Theremin
• Theremin controller
• Tone Filters for Electronic Organs (PDF)
• Transistor organ
• Treble Booster/Overdrive including a perf board circuit layout
• Tube Screamer-based overdrive. Schematic and PCB/perfboard layouts.
• Two channel distortion circuit
• Ultra Simple Bass Guitar Compressor
• Umble - A distortion stompbox, inspired by Dumble amplifiers. Schematic and PCB/perfboard layouts.
• Using the Hot Springs Reverb reverberation unit
• Versatile FET booster engine. Schematic and perfboard/PCB layouts.
• Vocal zapper
• Vox AC-30 Top Boost adapted for use as a distortion stompbox
• Wave Multiplier for music synthesizers
• Zonk Machine and Treble Booster