> On Wed, 3 Sep 1997, Joost Kooij wrote:
> Hi Joost Kooij,
> > > Does anyone know how efficient normal transformers (230V => e.g. 6V) with
> > diode
> > > based rectifiers are? If it is high enough so that a DC/DC switching
> > > like the LM2574-5.0 (only about 77% efficiency :-( ) could be used? This
> > > be pretty easy, because the mentioned inductors are very easy to get ...
> > Why do you care so much about efficiency if you are going to feed it
> > from mains voltage anyway?
> I have already many devices at home that run 24hours a day (2 video recorder,
> sat receiver, TV`s, ...) and I want to reduce costs ... So, why waste lots of
> energy for *nothing* ????? (I have more efficient possibilities to heat my
> rooms ;-) )