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

Florian Anwander fanwander at mnet-online.de
Mon Jun 6 12:00:22 CEST 2016

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 
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."


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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