Re: power supply question
- From: melee5@xxxxxxxxxxx
- Date: Wed, 30 Jan 2008 18:59:20 -0800 (PST)
On Jan 27, 2:46 am, lou <Lou...@xxxxxxxxx> wrote:
Hi!
Would appreciate some help.
Was thinking of using a car radio at home. Specs read current
consumption 1.5A (at .5W).
The fuse is 5A.
DC power supply should be at least 1.5A but can I go up to 4A without
harming the radio?
Not sure if I would gain any improvement in sound.
Thanks!
Please cc: my email address if possible.
Louis
Lou...@xxxxxxx
Google groups has munged your email address such that we can't see
what it was. Otherwise, you've just invited every spamer in the world
to hit your mailbox, how could you possibly pick out an answer from
all that spam? You should have disguised your email address along the
lines of Louis?_nospam_ATmsnDOTcom and then tell people to remove
_nospam_ as if we really aren't smart enough to do so without being
told. OR are too dumb to figure out what AT and DOT really stand
for. Yet that silly bit of stuff allows you to put your email address
in places where it can be used but still not read by spam-bots. But,
it's also bad etiquette to ask for an email answer in a news group as
that way no answer shows up in the news group and that defeats the
whole purpose of the news group to start with.
Having done what you want to do myself, I can state that you won't be
happy with most "DC power supplies" in that they will make so much
noise as to make listening to the car radio a non-pleasent
experiance. None have passed the hum test as far as I am concerned
and any that are well enough filtered will be very expensive to
purchase. Perhaps a better solution would be to use a car battery
with a cheap battery charger and charge the battery when you are not
listening? I have my charger set up on a 110 volt timer such that
after 6 hours or so of charging it shuts off as I have removed the
"on" triggering device from the timer it only turns off now. I charge
my battery twice a month and expect it to last several years more and
it already has two years so far. I have a 4 amp charger that is some
30 years old and is more than enough for the job at hand.
Your comment on "would gain any improvement in sound." indicates a
severe lack of knowledge on the subject of electronics. No, there
will be no improvement in "sound" (?) that way. Your amperage draw
will only be as much as the radio needs to use as a general
statement. If you force more amperage into it by means of using
higher than the nominal range of car voltage of 10--13.75 volts then
you risk damaging the radio severely - so don't do that!! If you
DON'T use a car battery to act as a power supply sink you may wind up
with higher than nominal voltage anyway, all depending on exactly just
what power supply or battery eliminator you are attempting to use
here. Again any battery eliminator or voltage regulated power supply
filtered adequately enough to pass a "hum" listening test will cost 3
to 10 times as much as a standard, plain jane 4 amp battery charger
like mine ($40). Trickle chargers will ruin car batteries if left on
permantly and so-called battery maintainers tend to ruin batteries as
well. The only method I have found to work for more than a year at a
time is the one I currenty use - a car battery that gets charged every
other week or so for 6 hours or so ONLY.
.
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