Gerald,
Actually, those devices may NOT go up in smoke if fed DC to the
Wall-Wart input, even if the output of the latter is AC. Many of them
have a rectifier circuit as the first thing inside them and will operate
just fine on DC. If you look at this picture,
http://www.oldengine.org/members/jdunmyer/personal/computer/jun08_03.jpg
you'll see 33 Supra modems, all fed from a big Astron power supply, set
on 9 volts. The Supras are designed to operate from a 12VAC wall-wart.
Not only did they work fine, but they ran considerably cooler because
the internal voltage regulator didn't have to dissipate so much heat.
I'd still use a small inverter and not worry about the little bit of
efficiency loss. If Bob is truly concerned about AH consumption from his
battery, he'd consider going to a smaller screen TV instead of the 13"
outfit that he's looking at.
<<Jim>>
"Dr. Gerald N. Johnson, electrical engineer" wrote:
>
>
> > Turns out the SONY is only 7.5 volts so the Radio Shack system should
> > convert.
>
> PROVIDING its DC. If its AC and it could be, then there may be smoke
> from the SONY burning up.
>
> >
> > Cordless phone, maybe. If it truly runs on 12 volts DC from
> > the walwart
> > then you should be able to connect it to the trailer 12 volt
> > battery.
> >
> > It is definitely 12 volt so should go straight through
>
> IF the cordless phone input is DC. If its AC there will be smoke from it
> burning up.
>
--
<<http://www.oldengine.org/members/jdunmyer>>
<<[EMAIL PROTECTED]>>
<<lower SE Michigan, USA>>
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