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#529523 7th Jun 2011 9:26pm
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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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chris_gilly #529536 7th Jun 2011 9:59pm
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If i remember rightly,if they have wattage on the back divide by 12 gives you the ampage


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chris_gilly #529552 7th Jun 2011 10:32pm
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nope no wattage on them, checked thoroughly frown

chris_gilly #529553 7th Jun 2011 10:35pm
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Thats funny should have wattage on them.

what sort of tv is it?


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chris_gilly #529556 7th Jun 2011 10:37pm
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Have you tried them working off a battery charger,a low amp one 8-11 amps


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chris_gilly #529557 7th Jun 2011 10:39pm
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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.

chris_gilly #529558 7th Jun 2011 10:41pm
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No model number is there mate?


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chris_gilly #529559 7th Jun 2011 10:41pm
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Careful, you should really use a "Regulated Power Supply" and it's unlikely the battery charger is regulated.


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chris_gilly #529563 7th Jun 2011 10:50pm
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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.



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chris_gilly #529564 7th Jun 2011 10:50pm
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As a rough guide the currant draw for each item has to be less than the fuse protecting each item.

chris_gilly #529570 7th Jun 2011 11:07pm
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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.

chris_gilly #529571 7th Jun 2011 11:09pm
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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.


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chris_gilly #529606 8th Jun 2011 5:06am
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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 ?

Mark #529644 8th Jun 2011 8:24am
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Originally Posted by Mark
wouldnt it be a whole lot easier to buy an inverter?

Sounds like a good idea!

Mark #529700 8th Jun 2011 10:58am
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Originally Posted by Mark
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 wink


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