[sdiy] CEM3340: VCC +10V vs +11V

[bbob]

The original spec is for nominal 15v (max 18v) supplies.  Nor clear why
you'd drop to 12?

On Mon, Jun 6, 2016 at 6:58 AM, Tom Wiltshire <tom at electricdruid.net> wrote:

> If you were designing with it now (which it looks like we could
> realistically do) then you could run a +/-15V power supply, with +12V for
> the VCOs. That'd give you the best of all worlds - headroom and stability.
>
> On 6 Jun 2016, at 11:00, Florian Anwander <fanwander at mnet-online.de>
> wrote:
>
> > You are right.
> >
> > I got meanwhile also an answer from Dieter (english translation by me):
> >
> > "We use 10V for the CEM3340, in order to achieve an even better
> stability (if the + 12V would vary slightly, the internal 10V on the module
> still are stable). But we had always problems, because obviously not all
> CEM3340 worked properly with 10V(even if the datasheet indicated so).
> > In the last production series of the A-111-1, we bridged 7810and
> operated the CEM3340 directly on 12V. The A-100PSU2 was so stable that
> there were no problems here."
> >
> > Florian
> >
> > Am 06.06.2016 um 11:00 schrieb Vladimir Pantelic:
> >>
> >>
> >> On Jun 6, 2016 10:38 AM, "Florian Anwander" <fanwander at mnet-online.de
> <mailto:fanwander at mnet-online.de>> wrote:
> >> >
> >> > What might be the reason to run the 3340 at a lower VCC?
> >>
> >> I see a 7810 regulator on the PCB, so I'd guess they wanted additional
> stabilization for the chip's supply voltage
> >>
> >
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