[sdiy] VCO reset time

[Scott Gravenhorst]

Tony Clark <clark at andrews.edu> wrote:
>   Hi List,
>
>   I guess if your VCO's don't double as LFO's, then you can get away 
>with the triangle-core waveshaping techniques.  But I ran into problems 
>with that as explained below.
>
>   Before settling on a sawtooth core years ago, I had played around with 
>triangle cores, but I found that I had a problem with the waveshaping 
>aspect.  The tri-to-saw conversion is not good in that, in typical 
>circuits, the wave is at double frequency to the triangle wave.  However, 
>if you use a bit more circuitry you can achieve a corrected frequency 
>sawtooth, but the waveform is glitchy and unsuitable for LFO applications.
>   This just doesn't occur in saw-to-tri converter.  While there 
>certainly is a glitch in the conversion, it is more pronounced at high 
>frequencies and is undetectable at LFO ranges.
>   Just my observation on the matter.
>
>   Cheers,
>
>   Tony

That's interesting, but why is the double frequency a problem?  do you
often use a sychronized saw and tri output from an LFO?  Just curious.


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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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