[sdiy] Siel opera6 schematics

[Neil Johnson]

Hi,

Scott Nordlund <gsn10 at hotmail.com> wrote: 
> Also, does anyone know if there's any merit to the "some have VCOs,
> some have DCOs" rumor?  I've heard it multiple times but never seen
> anything to confirm it.  All of them that I've seen use the same SSM
> 2031 VCOs with TMS3631 dividers.  The only changes I know of are front
> panel/program button designs, different OS versions, and CPU boards
> with a separate noise generator board.
> If true VCO versions exist, they must be very rare.

The only schematics I've seen are those from S.Meyer's Siel website.  They _only_ show the HF-VCO + dividers architecture.  My guess is that since you can describe this as VCO or DCO they mixed up terms between different models depending on the market conditions..?  I think 12 SSM2031 VCOs would be very expensive, and quite rare.

Perhaps there is some urban-myth going on regarding the VCO/DCO?  Possibly stirred up by the panel marking, which may well have said 'VCO' and 'DCO' at various times / different models.

Unless someone has concrete proof either way..?

Cheers,
Neil