[sdiy] Adding sync to dual oscillator Yamaha CS synths

[yves usson]

Yes it's been done by Erik G. in 1999 for his CS15. 
http://home.swipnet.se/ericg/
Since the mod files are no longer available at his site, I will send 
them to you directly.

Cheers

Yves Yusynth

Richard Atkinson a écrit :
> Hi all,
> 
> I've been growing tired of the wimpy sound of my Yamaha CS-15D. Apart 
> from adding extra controls for Channel I, I thought I'd have a go at 
> adding oscillator sync.
> 
> Has anyone ever tried this before? I'm not aware of any CS series 
> instruments that have it as standard, but it looks like it might be 
> possible. I had a look at the Yamaha IC Guide Book:
> 
> http://www.loscha.com/miller/Yamaha_IC_Data_Book.pdf
> 
> iG00153 VCO III is on pages 35 & 36. It looks like the VCO integrator 
> capacitor at pin 14 of the first VCO could be discharged to GND by 
> connecting a transistor across it, controlled by the one-shot 
> multi-vibrator waveform at pin 10 of the second VCO. The waveform 
> actually available at pin 10 of an iG00153 may need some buffering 
> and/or inversion to perform this task, but it strikes me it should be 
> possible.
> 
> Richard
> 
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