The DoubleDeka Ultrasonic VCO

via frijitz in this electro-music.com thread.

"The DoubleDeka is my new VCO. From the forthcoming documentation:
'This unique VCO consists of an ultrasonic oscillator core followed by a parallel pair of waveform generators. Each waveform generator consists of a switched multi- ctave divider followed by circuitry to generate a 10-step waveform using a set of 10 slider potentiometers. Also included are a novel synchronization circuit with two different operating modes and a built-in "digital ring modulator" (DRM) for producing a wide variety of synchronized and anharmonic sounds. The oscillator core is highly stable (better than 20 ppm/K in the prototype) and features wide-range, accurate tracking (better than 0.05% over fifteen octaves). The variable waveform generator provides fine control over an enormous range of available timbers.'

PCBs have been tested and will be available -- along with kits and panels -- from bridechamber.com.

For now here are some demos:
demo01 -- switching through the octaves and then moving the sliders around.
demo02 -- with fixed waveforms, switching through all the combinations of the octave switches.
demo03 -- a patch with the two waves fed through two VCFs.
demo04 -- four waves from two units; raw sounds without filtering.
demo05 -- sweeps of a Tri VCO fed into the the sync input (two sync modes) and then into the RM input.

(Sheesh, they were in the correct order in the preview. Has anybody figured out how the ordering works?)"

demo links at the thread.