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Joined: Feb 2009
Posts: 1,952
Forum Addict
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OP
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Joined: Feb 2009
Posts: 1,952 |
hey all,
right im in the middle of setting up a tv screen and dvd player/ radio player all out of a car 12v system in the garage,
but i need a power adapter to run them off, the devices mention no sort of ampage, of course they need a 12v supply, but my question is what sort of ampage will i need from the transformer to run both.
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Joined: Oct 2010
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Forum Guardian
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Forum Guardian
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If i remember rightly,if they have wattage on the back divide by 12 gives you the ampage
Every dog has its day!
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OP
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nope no wattage on them, checked thoroughly 
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Joined: Oct 2010
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Forum Guardian
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Forum Guardian
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Thats funny should have wattage on them.
what sort of tv is it?
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Joined: Oct 2010
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Forum Guardian
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Forum Guardian
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Have you tried them working off a battery charger,a low amp one 8-11 amps
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OP
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ive tried a small 12v battery, i want the transformer as small as poss, i have lots of them lying round so hoping to use one of mine,
tv's only one used for dvd players in car about a 10" if that.
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Joined: Aug 2005
Posts: 16,345 Likes: 1
Wiki Master
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Wiki Master
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No model number is there mate?
![[Linked Image]](https://www.wikiwirral.co.uk/forums/ubbthreads.php/ubb/download/Number/13143/filename/sig.jpg) ![[Linked Image]](https://www.wikiwirral.co.uk/forums/ubbthreads.php/ubb/download/Number/13362/filename/rant0000.gif) Putin khuilo
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Joined: Aug 2009
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Enthusiast
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Enthusiast
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Careful, you should really use a "Regulated Power Supply" and it's unlikely the battery charger is regulated.
Causing mayhem since 1959
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Joined: Oct 2010
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On my boat,all 12v. i have a 19 inch flat screen which is 40 watts that works fine with a little car battery charger.
Have the transformers got adjustable ampage,if so start off at about 4 amps see if it works if not adjust up till they work,if not wire them up to your small battery and charger.
Every dog has its day!
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Forum Master
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Forum Master
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As a rough guide the currant draw for each item has to be less than the fuse protecting each item.
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Joined: Jun 2009
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Forum Guide
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Forum Guide
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The old Curtis monitor and dvd player I have say 3amp for both, there is a load of 12v 3amp or more power supplies about especially at the car boot sales.
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Wiki Master
Joined: Jul 2008
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If they are designed for car use (ie happy with 13.8V) then I've used a small car battery charger across a car battery, often letting the battery supply the power by itself at times.
We don't do charity in Germany, we pay taxes. Charity is a failure of governments' responsibilities - Henning Wehn https://ddue.uk
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wouldnt it be a whole lot easier to buy an inverter ?
i do think this is a question for Ohms Law ?
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Wiki Master
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wouldnt it be a whole lot easier to buy an inverter? Sounds like a good idea!
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Joined: Jul 2008
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Wiki Master
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Wiki Master
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wouldnt it be a whole lot easier to buy an inverter ?
i do think this is a question for Ohms Law ? Presumably, if they ran of mains, he would just plug it into the mains instead of wanting a transformer 
We don't do charity in Germany, we pay taxes. Charity is a failure of governments' responsibilities - Henning Wehn https://ddue.uk
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