Origami: a collection of guitar effects.

A collection of analogue effects processing circuits. These are simulations and not complete designs but will take relatively little work to turn into finished designs that can be transferred to PCB. More work is required on things like the input buffering, pre-amplification and gain or tone controls, output buffering and mixer stages and power supply (the simulations are all based on a split +/-4.5V supply but in practice a single 9V with 4.5V MIDVCC supply rail generation may be more practical). The three basic stages could be made into self contained rack mounting modules or pedals or they could all be combined into some kind of out-of-control Origasmic Wave Folding Machine of Doom that folds the whole of all possible spaces into a single eternal power chord of ultimate destiny. Or not. The three basic effects are: 1. Clipping and Full wave rectification (similar to that used in the EasyEDA Tesseract Guitar Practice Amplifier) 2. Peak Folding which folds the positive and negative peaks of a waveform about a dynamic folding level. There are two stages of this so the second stage folds the peaks of the already folded output of the first stage. There are two versions of this effect having slightly different circuits to track the peak amplitude. The folding stages of this effect have been christened `Origamplifiers`. Because I like the name. 3. Octave Down stages to generate sub-octave harmonic content by dividing down a clipped form of the input signal and then using the outputs of the divider to synchronously chop and/or rectify the input signal. Again, there are two stages the second further processing the output of the first. This design shows part of a simple mixing scheme to give flexible control of the overall output but in pratice a simpler mixer and some sort of a patch panel may be a better solution as the number of pots gets out of hand, especially if stereo mixing, possibly with some additional tone controls, is desired. All the effects will work with a guitar input but may work best with monophonic sources such as mono synthesisers, mic'ed up wind instruments and voice. #### Please respect the CC-BY-NC-SA 3.0 license. Thanks.