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Wow, huge collection of DIY synth circuit diagrams from René Schmitz! Pictured here... Triangle thru zero VCO - "A thru zero oscillator is one that can go forward and backward. This allows for deeper frequency modulation. Sonically there are interesting a little yamaha-ish sounds possible. This oscillator sounds somewhat dirty when the modulation index is time variable. But clean non-time-variant timbres are possible. I've put up several samples here, to give you an impression of the sounds I obtained..." [via] - Link.
Related:
- Synthesizers @ MAKE - Link.
