SV: [sdiy] QVCO schemo up

[Ian Fritz]

At 02:51 PM 11/11/05, JH. wrote:

>I've posted a drawing (simulated, but not tested) of a
>possible version of the QVCO from Tietze/Schenk
>here:
>http://www.oldcrows.net/~jhaible/matrix_fx/jh_ts_qvco_idea.pdf
>They have drawn it with analog computer building blocks,.
>which I changed to AD633s and THAT VCAs.
>They advertise this circuit for being frequency modulated
>without amplitude effects, as opposed to FM'ing LC
>oscillator.

Looks interesting.  Aren't there problems with the 633 as far as offsets?

   Ian