Alarm clock powersuply question

[lycao]

I just took apart my mom's alarm clock that just broke to see what make's it tick hehe :P and i guted it for part's to i took the powersuply out and it made me think about somthing i was thinking of doing a while ago if i put that powersuply in my ps2 and have it on it's own plug which it has could i run led's right off of it (with resistor's of course) but would that work or would i need somthing else to make it work? I dont know what the voltage on it is (dont have a multimeter) i looked it up and alarm clock's run off of 7.5-12V so asumeing it is let's say 12V just incase what would work?

[lycao]

I just figured out what resistor i'd need it's 470 but the led calculator dosent say what 470 cuz there's a 470 and a 470k this is what i got

Supply voltage 12V
Diode forward voltage 3.3V
Diode rated current 20 ma

Calculated resistance value 435 ohm
Next standard 5% resistor * 470 ohm
Resistor color markings yellow violet brown
Power dissipated in LED** 61 mW
Power dissipated in resistor** 161 mW

any idea's?

this is the site i used http://linear1.org/ckts/led.php

[EspI69]

470 is 470 , 470k is 470000 (K = x 1000) it would work , but instead of doing that , just use the 2 solder points on the bottom of your psu already in your ps2. (its 12v as well)
dont do teh alarm thing, cuz ud also need a switch on the wire to turn them on and off and that seems gay lol jk.

[zabolyx]

But draining to much power from your PS2 can cause errors.... so if you are not using a crapload of LEDs then you should be fine.... If you plan on making your PS2 look like a landing strip a second power supply is not a bad idea... I was thinking of using a second PS2 PSU but this idea has some good merit... the PSU would be smaller..... and produce less heat....

but like "E" says you would need a way to turn them off... unless you don't want to turn them off.... or you can use the main power switch... just turn off the whole system....

[lycao]

lol you guy's just said the two thing im gonna do there's gonna be more then a few led's in there and i plan on useing a switch anywy two actuly and the switches have a led in them as well. The powersuplly it self is realy small so it's not like there would be a big room issue actuly i'll measure it right now .....it's biggest side is 30mm infact it'll fit nice and snug in the hdd bay.