Doepfer

The A-111-2 has no thru-zero feature but only a manual control and a CV
input for linear frequency adjustment/modulation. With all controls at
minimum the oscillation nearly stops (typ. 1Hz in VCO mode). But we are
working on a thru zero version of the A-111-2 (probably named A-111-4). But
it's too early to publish any details as the circuit is a bit more
complicated. It's based on a suggestion by Doug Curtis in his documents we
obtained while we were the European distributor for the Curtis chips in the
the eighties. The circuit is similar to the CEM3340 based thru zero VCO by
Juergen Haible but with a few more features (like zero point modulation).

Best wishes
Dieter Doepfer





> Hi people,
>
> Does anyone know if the new VCO has thru zero capability? It
> looks like it from the LF control being able to go to 0 but there
> isn't specify mention.
>
> Neil