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Running LED's with a wall outlet

I have a question,

I am thinking of making a Pepakura Iron Man mask for my father for his desk at work.  I have big plans for this, but the biggest thing I want to do is had the Eyes light up. 

What all would i need to do this?  I would think using LED's would be the ideal way to go.  I dont really want to use batteries to power it, as I would like it to run off of a wall plug, and perhaps even have a switch to power on and off.

Any ideas?  I've looked all over, and I cant really find a deffinate way/means to power it through an outlet....most all just mention batteries.  I know it can be done though :)

Any help is GREATLY appreciated!

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electrobrandino (author) 6 years ago
Could i just use a DC Jack and Plug from Radioshack to power the unit?
A small 9V transformer such as this with a 5V regulator should give enough power to safely run as many LED's as you need. For a bit more, you can get a regulated 5V supply which will remove the need for the regulator.
electrobrandino (author)  The Skinnerz6 years ago
so would something like

http://www.radioshack.com/product/index.jsp?productId=3875402

work then? Im in the US so our outlets pin configurations are different of course ;)

This one is adjustable as far as voltage, and i think that should be enough mA....so other then this, all i would need is a jack to install in the unit (and all the leds, resistors and such of course
oh, and it says that it is regulated :)
You should be able to run quite a few LED's straight from it on the 4.5V setting, as well as any IC you may want to add to flash the LED's.
electrobrandino (author)  The Skinnerz6 years ago
well i have another question :)

when i calculate it up, i would need a 51Ohm resistor for each bulb if i ran it at 4.5v... The bulbs i found are 3.3v and 25mA and i am using 6 of them. (i want it bright :P )

I cant really find a 51 Ohm resistor readily available, so here is my question...

Can I bump it up to 9v and still run it safely? at 9v, i could use 100Ohm resistors on each bulb, which i can get very easily...

WIll this cause any other issues?

see here for the calculator i used.

http://ledcalculator.net/default.aspx?values=9,3.3,25,6,0

Thanks again for all of your help. just getting this info confirmed is helpful!
About 8 ohms with the 6 LED's in parallel on the 4.5V setting should work. Alternatively, put them in two rows of three, straight from the supply, as 0.3V less than the rating should make no noticable difference to the brightness, and the supply will probably put out

The calculation is correct, although a single 30 ohm resistor would work just as well.

It doesn't matter about the exact value of the resistors, as long as they are reasonably close.
electrobrandino (author)  The Skinnerz6 years ago
so, 2 Straight rows with 3 bulbs each...would i need a resistor at all? and if so on which line or both..I think im confusing myself now haha.

sorry im really new to the LED scene :P I've re- soldered old game system boards and things like that but these Little LED's are kicking my rear! :)
2 rows of 3, on 9v will not need a resistor. Just treat them like any other component, and if in doubt apply V=I*R.
electrobrandino (author)  The Skinnerz6 years ago
I got all of the supplies but im having trouble wiring up the DC jack...there are NO instructions on if one needs to be the + and the other - or what....anyone have any ideas? there is a pole in the middle to be soldered to, and a tab on the outside. here is the plug i got exactly

Size M Panel-mount Coaxial DC Power Jack

http://www.radioshack.com/product/index.jsp?productId=2102486
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