This guy makes some interesting stuff.
BugBrand Drone Machine
Not generally available! Five have been built - one kept for personal use.
No More! No More!
Looking a bit like a box for make-up, the new Drone Machine is powerful-but-portable fully modular synth and processing device in a compact carry case.
Featuring:
Audio input with Envelope Follower - input preamp with variable decay envelope follower (EnvFlw based on SynTom ideas)
Ring Modulator - using the AD633 multiplier chip
3 x Voltage Controlled Oscillators (plus Low Freq Osc) - three powerful VCOs (based around the Thomas Henry XR2206 VCO) that can also run at low freqs for modulation, offering tri / sin / sqr waveforms, plenty of modulation and sync function.
Voltage Controlled Filter - state variable (Lo / Band / Hi response) resonant filter with modulation and two audio inputs
Digi-delay - based around the PT2399 digital delay chip that can be cranked down into very noised-up territories.
2 x Voltage Inverters - for audio or CVs
Output Mixer - 3 channels mixed to mono output
All connections, other than input / output, are on 4mm banana plugs which open up a vast array of connective potential. Powered by a 12V AC adaptor.
Spring Reverb
A spring reverb tray and mixer/driver unit to drench sounds in lucious waves of distance.
Workshop Noise Machine
Released May2008
Sooner or later I'll get together a decent building guide and offer some kits - I've just run the workshop in Berlin for Pickled Feet and it was a great success with 14 people successfully building the machines (some people had zero electronics experience - well done them!)
Tom Bugs
Website with loads of schematics:
http://www.bugbrand.co.uk/