Lockhart wavefolder

A 2HP version of the Lockhart wavefolder as popularised by Ken Stone with his CGS-52 module.

With this module, it's possible to control the amount of current running through the positive and negative arms of the wavefolding section, which can lead to some interesting results irrespective of whether you're fettling audio or control voltages.

The 'main' output gives the folded waveform whilst the 'square' output will, under certain circumstances, give an arrhythmic pulse train which can be used either as a modulation source or a square-wave oscillator in its own right. Keep in mind, though, that the depending on the biasing of the transistors you may not get anything out of the square output despite there being a folded waveform present on the 'other' output.

Works best with sine or triangle-based waveforms but there's nothing to stop you putting, well, anything into it - altering the level of the input signal can lead to some very interesting filter-like effects.

If you really want to fatten up a sound, run it through a low-pass filter (or any filter) before feeding it into the wavefolder. Works really well on basslines if you use a resonant filter.

100% hand-made with surface-mount components and, best of all, it fits inside 2HP.

With a bit of knob-twiddling, you can make it sound like this: https://yomo.interzen.co.uk/samples/cgs52.mp3

Panels are laser-cut and engraved 3mm perspex in opaque black. Mounting hardware (M3x10 machine screws) and a power cable are also supplied.

https://www.yorkmodular.co.uk/products/lockhart-wavefolder-with-fr4-panel-2hp