PCB & panel to build a Eurorack chorus module for incredible VCO multiplicationDesigned by PM Foundations in United States of America
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Summary If you want a richer sound from your VCOs, add this chorus module to your rack. This module generates six copies of the input saw wave, each out of phase with the original and with each ot...Read More…
If you want a richer sound from your VCOs, add this chorus module to your rack. This module generates six copies of the input saw wave, each out of phase with the original and with each other. The phase differences are continually changing using six internal trapezoid oscillators. This effect replicates six VCOs tuned closely together to generate a rich, dynamic super saw wave.
This is a PCB and Panel set only. A set of 1 high quality PCB and 1 front panel ONLY are included. You will need to purchase your own components and build your own module. Comprehensive build instructions and BOM are provided to help you source the components needed. Some product photos above show COMPLETED build.
The multiplier consists of six phase shifting comparators that generate new sawtooth waves from the input. A six stage trapezoid oscillator drives each comparator high in 1/3 cycle increments. Three phases oscillate at about 0.6Hz and three at about 0.4Hz. The constantly changing phase relationships create shifting saw waves which are combined with the original saw wave at the output. Note that the output is a ramp for a saw wave input and the output is a saw for a ramp input.
Comprehensive documentation, parts lists are provided in the documentation link for building, testing and calibrating the module.
[This module is a tribute to David Ward-Hunt who designed a waveform multiplier unit that was subsequently included in the Digisound-80 synthesiser. https://www.discogs.com/artist/14979-Wavestar]
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