SV: Re: [sdiy] Digital VCO

[Tim Parkhurst]

On 4/24/06, Michael Bacich <weareas1 at earthlink.net> wrote:
>
> They can also use the rising and falling edges of the 50% square wave to
> toggle a switch to alternate wave direction in a ramp-to-triangle
> waveshaper, if they want to also provide a triangle wave (not very common,
> though).  Most of this waveshaping stuff is done inside of the CEM3394 chip
> that's used in the Oberheim Matrix 6, Matrix 1000, and some of the Akais
> that had DCO's.  All the chip needs is the square wave input and the CV's to
> control and select the waveshape and the proportional saw amplitude.  This
> greatly reduces the amount of ancillary circuitry needed by the system.  The
> Roland DCO synths required a lot of analog circuitry per DCO.
>
 That would be the CEM 3396, but your explanation is otherwise
perfect! The 3396 is a neat chip, too bad they're so darned hard to
get.

Tim (otherwise perfect) Servo
--
"Imagination is more important than knowledge." - Albert Einstein