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#529523 - 7th Jun 2011 10:26pm 12v tranformer
chris_gilly Offline

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Registered: 15th Feb 2009
Posts: 1950
Loc: tranmere
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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#529536 - 7th Jun 2011 10:59pm Re: 12v tranformer [Re: chris_gilly]
poodlepup Offline
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Registered: 6th Oct 2010
Posts: 3973
Loc: wirral
If i remember rightly,if they have wattage on the back divide by 12 gives you the ampage
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#529552 - 7th Jun 2011 11:32pm Re: 12v tranformer [Re: chris_gilly]
chris_gilly Offline

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Registered: 15th Feb 2009
Posts: 1950
Loc: tranmere
nope no wattage on them, checked thoroughly frown

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#529553 - 7th Jun 2011 11:35pm Re: 12v tranformer [Re: chris_gilly]
poodlepup Offline
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Registered: 6th Oct 2010
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Thats funny should have wattage on them.

what sort of tv is it?
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#529556 - 7th Jun 2011 11:37pm Re: 12v tranformer [Re: chris_gilly]
poodlepup Offline
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Registered: 6th Oct 2010
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Have you tried them working off a battery charger,a low amp one 8-11 amps
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#529557 - 7th Jun 2011 11:39pm Re: 12v tranformer [Re: chris_gilly]
chris_gilly Offline

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Registered: 15th Feb 2009
Posts: 1950
Loc: tranmere
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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#529558 - 7th Jun 2011 11:41pm Re: 12v tranformer [Re: chris_gilly]
_Ste_ Offline


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Registered: 7th Aug 2005
Posts: 16054
Loc: New Brighton
No model number is there mate?
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#529559 - 7th Jun 2011 11:41pm Re: 12v tranformer [Re: chris_gilly]
ianbx1 Offline
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Registered: 1st Aug 2009
Posts: 194
Loc: Woodchurch
Careful, you should really use a "Regulated Power Supply" and it's unlikely the battery charger is regulated.
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#529563 - 7th Jun 2011 11:50pm Re: 12v tranformer [Re: chris_gilly]
poodlepup Offline
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Registered: 6th Oct 2010
Posts: 3973
Loc: wirral
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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#529564 - 7th Jun 2011 11:50pm Re: 12v tranformer [Re: chris_gilly]
KevinFinity Offline

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Registered: 30th Apr 2009
Posts: 2324
Loc: Wirral
As a rough guide the currant draw for each item has to be less than the fuse protecting each item.

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#529570 - 8th Jun 2011 12:07am Re: 12v tranformer [Re: chris_gilly]
davew3 Offline
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Registered: 16th Jun 2009
Posts: 1024
Loc: Wirral
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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#529571 - 8th Jun 2011 12:09am Re: 12v tranformer [Re: chris_gilly]
diggingdeeper Offline

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Registered: 9th Jul 2008
Posts: 10808
Loc: Birkenhead
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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#529606 - 8th Jun 2011 6:06am Re: 12v tranformer [Re: chris_gilly]
Mark Offline


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Registered: 9th Nov 2003
Posts: 21086
Loc: Wirral
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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#529644 - 8th Jun 2011 9:24am Re: 12v tranformer [Re: Mark]
MattLFC Offline
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Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
Originally Posted By: Mark
wouldnt it be a whole lot easier to buy an inverter?

Sounds like a good idea!

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#529700 - 8th Jun 2011 11:58am Re: 12v tranformer [Re: Mark]
diggingdeeper Offline

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Registered: 9th Jul 2008
Posts: 10808
Loc: Birkenhead
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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