VCO update

[patchell]

Ian Fritz wrote:

> Listers --
>
> I've spent some time to put my latest tri VCO onto a real circuit board
> (well, OK, it's just vectorboard). I made a few minor modifications and
> changed the compensation scheme around a bit. Also, I developed a new
> tri->saw waveshaper, using analog switches driven directly from the
> comparitors in the main oscillator. This gives a very clean sawtooth.

    I did something similar a long time ago.  I used a BJT for the switch, and
there was only one, but same idea, reversed the gain of an op-amp stage.  Even
the BJT version worked pretty good.  Except I needed a pot to make sure the two
segments lined up.  Never had a triangle oscialtor since, so I never had any
need to re-visit that methode.  The CEM3340 does basically the same thing as
well.

> I also
> investigated a new synchronization method using pulses to "kick" the
> oscillator, rather than resetting the waveform.
>

    This sounds pretty cool.  Can you put together a short MP3 of an oscilator
attaining "sync"?

>
> It's all up on my website (VCO2, under synth circuits), so I won't go into
> more detail here. Let me know what you think!
>
>   Ian
>
> http://home.earthlink.net/~ijfritz

--
 -Jim
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