Ultra-Flanger guitar effect
I was originally going to develop a minimum part count version of the EH Electric Mistress. Instead I went for a something with the versatility of an MXR flange...
Frobnicator effect for Guitar
This is a ring-modulator which doubles as a tremolo. It was designed as a replacement for the somewhat over-complicated ElectroHarmonix Frequency Analyzer with ...
Guitar Titan Boost and Titan Octave effects
A simple boost circuit that gives 30 volts pk/pk output using a 9 volt battery. The addition of a Ge diode bridge makes a surprisingly good octave box....
Guitar OmniDrive effect
This is a versatile distortion pedal. Think of it as analogue modelling, using analogue circuitry to model a wide range of analogue distortion devices. It inclu...
Guitar Crash Sync effect
This is an oscillator sync circuit that gives the kind of effect you find on old analogue synths. Oscillator synchronisation is performed by using one oscillato...
Zombie Chorus Guitar effect
This is my reincarnation of the EH Small Clone and Roland CE-1. Unlike the Clone it has a proper depth control. It also has a switch to change between the CE-1 ...
EasyVibe guitar effect
I aimed to copy the sound rather than the vintage circuit. Easy to build, low current consumption, no signal level changes on bypass, quiet and, most importantl...
PC Microphone Preamplifier
Soundblaster soundcard series (SB16, SB32, AWE32 and AWE64) have all a microphone input designed to be used with the electret microphones which come with the so...
Line signal to phono adaptor circuit
Many amplifiers have phono inputs for connecting record players to the amplifier. Phono input is designed to take a up to few millivolt signal from phono pickup...
MIDI tester circuit
Sometimes when experimenting with different soundcards and MIDI interfaces it is useful to see if there is some data going in MIDI interface. This can be easily...
Audio isolation transformer
If you want to build one yourself, you have to get two audio transformers which have 1:1 transformation ratio and greater than 1 kohm impedance. There are high ...
Passive Audio Mixer
I designed this circuit for one friend of mine to be used as a small portable DJ mixer. The circuit is an audio mixer circuit so simple as it can be. There are ...
Desktop Audio Switch box
One of the more frequently requested projects on HeadWize has been a switchbox for selecting multiple audio inputs. I built this passive preamp/switchbox severa...
Signal Tracer
A simple test circuit to fault find audio and radio equipment. Can be used to inject a square wave signal, rich in harmonics, or used with headphones as an audi...
Advanced Volume control
This circuit could be used for replacing your manual volume control in a stereo amplifier. In this circuit, push-to-on switch S1 controls the forward (volume in...
Stereo channel controller
The add-on circuit presented here is useful for stereo systems. This circuit has provision for connecting stereo outputs from four different sources/channels as...
Melody generator schematic
This tiny circuit comprising of a single 3 terminal IC UM66 can be built small enough to be placed inside a greeting card and operated off a single 3V flat butt...
Big Ben Sound circuit
This circuit produces the famous Big Ben sound. It produces the "ding dong" sound when switched ON.
Basically the circuit alternates between two frequencies wh...
Music Instrument design
For those who don't know what a Theremin is, it's one of the first synths ever made and it's named after his inventor, Mr. Leon Theremin (a Russian guy). It's p...
Attenuator schematic
Two low voltage, low power zeners are used to control electronically the level of an audio signal. The attenuation range is from 6 to 58dB for an input current ...