I believe the OP (many days ago now IIRC) stated that the load was
incandescent illumination. If this is the case, then I would have a set of
AC inputs that go into a bridge rectifier, and a set of DC inputs that
bypass the rectifier for efficiency. Then I'd just switch with some sort of
FET.

Bob Ammerman
RAm Systems

----- Original Message -----
From: "SM Ling" <ipal11@SINGNET.COM.SG>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, September 29, 2003 11:18 AM
Subject: Re: [EE:] Options for switching ac and dc?


> Can you enlighten me why you need something that can switch 230Vac as well
> as some relatively low DC voltage at the same time?
>
> Should you be using different type of switches? I am puzzled as I can't
> think of many reasons.
>
> Cheers, Ling SM
>
>
> > John N. Power wrote:
> >
> > >The generic name for an isolated power driver like this is a
> > > "Solid State Relay" or SSR. These are modules which contain
> > > the output device (SCR, TRIAC, MOSFET or whatever), with
> > > an isolated input device (optocoupler, etc).
> >
> > I am aware of SSR products, but I have yet to find a single devce that
> would be
> > capable of switching ac or dc.
> > For example, the vast majority of SSR devices I have found use a triac
> output
> >  with zero crossing detector and snubber network) and thus are not the
> best
> > choice for dc switching I would have thought?
>
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