On Fri, 09 Jul 2004 04:34:52 GMT, "Don"
wrote:

"Brent Geery" wrote:
On Thu, 08 Jul 2004 19:47:00 -0400, TB wrote:

Jim
After the positive response i bought a Sharp 13". Although the unit is 12
volt , the only power source supplied is a 120AC to 12v DC adaptor. It
would be better to run direct from 12v rather than through an inverter.
How do you do it? Do you know if Sharp supply a 12v direct cord. I don't
want to just cut the cable after the transformer in case it HAS to be
12v and won't tolerate say 14v as the sytem will be when charging.
Tony

Is that "power supply" just a standard unregulated AC-to-DC "wall
wart"? If so, I'm almost completely sure you will have zero problems
running it directly off of your batteries, even at the 14.5 volts
during charging. If it's a regulated supply, more investigation will
be required to see if 14.5 volts can be tolerated by the TV.


I have a couple of years experience with a 15" Samsung LCD mounted on an
articulating tilt/swing arm. No problems at all, but I do find the remote
control to be very sensitive to the direction it's pointed. No big deal, I
only use it for volume control. I asked Samsung technical support about
direct connection to a 12v battery and they said it was not OK.

Of course they are going to say "no". Why even ask them? Standard
ass covering.

They told
me the acceptable range was pretty narrow around 12 V (same as stated on the
device label, but I don't remember exactly now, maybe +- 1 V.). In any
event _not_ OK at charging voltages. I've continued to use the 120V-12V
adapter provided, and a small inverter for use on the hook A 75 watt
inverter runs both TV and a VCR. I don't think that the manufacturer is
going to be willing to give any variation on their stated voltage range,
because if they did and there was a failure (even if not voltage related)
they could be responsible for repairs beyond their normal liability.

That's why I asked if it was an *unregulated* power supply. If it is,
the voltage will vary as the load varies, an the TV will be subjected
to voltages beyond 14.5 volts on occasion. Therefor the TV must have
the ability to deal with that variance in voltage. If it's a
regulated supply, the voltage swings will be very little, and they may
not have engineered a tolerance into the electronics.

--
BRENT - The Usenet typo king.

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