can i take this power supply http://www.princessauto.com/en/detail/90w-universal-a-c-laptop-charger-power-supply/A-p8607269e and change the output voltage to 12v and keeping output current at 4.73amps.(i talked to princess about the current and they told me it was)

 

It is possible but the solution is not so obvious. What are you planning on powering with it at 12VDC?

 

i want to power some 12v white led strip for a project

 

Find out how much current is required for the LEDs and then build a constant current supply from the 19VDC output for that amount of current.

 

One advantage with P.A. is they will give you a refund if you screw it up, no matter how long ago you bought it.
Max.

 

I don't know how much current you need but let us suppose you need 2A.
Then you have to dissipate (19V - 12V) x 2 A = 14W
A hunking big 3.5Ω 25W resistor will do the job - or a 6V 25W light bulb.
It would be better to find a 12VDC power supply which should not be too difficult a task.

 

Find out how much current is required for the LEDs and then build a constant current supply from the 19VDC output for that amount of current.

well there is the chart of the leds: i bought 2 quantities of white 1m non-waterproof

I don't know how much current you need but let us suppose you need 2A.
Then you have to dissipate (19V - 12V) x 2 A = 14W
A hunking big 3.5Ω 25W resistor will do the job - or a 6V 25W light bulb.
It would be better to find a 12VDC power supply which should not be too difficult a task.

will dc work? Someone told me to use Ac power supply.(i can get some dc adapters at be@electronics where i live, the max current one i can get is 1.6Amps though)
http://www.be-electronics.com/category_s/2380.htm
http://www.be-electronics.com/product_p/rpr1201a6p5.htm

 

12 V, 5 A, fully enclosed, less money: http://www.allelectronics.com/make-a-store/item/ps-1262/12-vdc-5-amp-power-supply/1.html

Other options: http://www.allelectronics.com/make-a-store/category/914/ac-dc-wall-adapters/pwr-supplies/1.html

ak

 

12V 5amp...$6.99

http://m.ebay.com/itm/301560486988?nav=SEARCH

 

Find a 12VDC adapter. Something like this:

http://www.be-electronics.com/product_p/68-121p-1.htm

Saskatoon : 2518 Faithful Ave. #103 Tel: (306) 249-5144 • Fax: (306) 249-5177

 

ok if everyone is looking at the chart i provided, what is the minimum amps i need for the output?

 

the leds vary from 0.4amp to 1.2amps, per strip, so how many strips x what current = adapter rating,

post#9 adapter...

 

1 1m strip

 

well @ 1mtr strip is 1.2amps, better to go with a bigger amps psu to give you more headroom...


NOTE,,, is this the same question???

http://forum.allaboutcircuits.com/threads/what-is-a-good-safe-voltage-for-led-light-strip.110929/

 

well @ 1mtr strip is 1.2amps, better to go with a bigger amps psu to give you more headroom...

is this good or too low http://www.be-electronics.com/product_p/rpr1201a6p5.htm

 

thats 1.6amps,

see my post #9, from ebay is $6.99 @ 5amps

 

thats 1.6amps,

see my post #9, from ebay is $6.99 @ 5amps

do i really need it that high though

 

better to get a higher rating psu, it will only give out what you need,also its cheaper

 

i guess i could order this one that you said http://www.ebay.ca/itm/LCD-AC-Power...5A-LCD-Monitor-Laptop-/301560486988?#shpCntId but im still waiting for an email to see if they ship to canada

 

i cant find a good, cheap 12v power supply on ebay.ca