[sdiy] monolithic VCO chips for FM??

[synthplayer88 at spymac.com]

On Mon Aug 30  1:07 , 'Czech Martin' <Martin.Czech at Micronas.com> sent:

>Yes, I´m using it.
>
>It can run faster than the 2206.
>And it has pwm / shaper for tri and sine.
>In fact this device started the search for 
>voltage controled tri-saw shaping on this list,
>if I can remember well.
>But the frequency will shift a bit in the 083, if
>shaping is at its extremes.
>From my head: I think it is the typical 1:10 lab oscillator. Wide
>sweeps are not the specialty of the 083


Hi Martin,
The data sheet indicates the 083 has the frequency range of up to 2 Mhz, we might
probably use up to 20Khz if that and most likely stop at 16Khz which is at the
bottom 100th of the 083's frequency output spectrum. Would you say the 083 is
quite competant/stable enough to sweep from 0 to 20Khz?  





>OTOH: the sine wave has much more distortion, the 2206 is a real
>good waveshaper principle sine vco, btw. Try to match this performance
>with discrete parts. For audio measurement I only use my very
>old and crapy looking 2206 oscillator.


would you say this distortion is obviously audible or did you actually measure it
with distortion meter or looking at it on a CRO and compared it with another signal?

Thanks!

regards,
Scott
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