/diy/ - Do It Yourself

[Anonymous No.379792]

Hi!
I have been planning to buy some pretty strong LEDs for my computer case, thinking about buying 9 of them.
The one I was looking at is this one http://www.amazon.com/Yesurprise-50pcs-10mm-White-Light/dp/B0092X7TF0/ref=sr_1_7?s=hi&ie=UTF8&qid=1358892716&sr=1-7&keywords=Super+bright+led+10mm
Currently I do not know how to power it, I do have an Arduino Uno laying around with a 5V or 3.4V output.
Should i reduce the number of LEDs and connect them in parallel, or power them with the power supply itself?

I recently bought a Schiit Magni, though the voltage on the AC adapter is made for 120 VAC in, but the voltage here is 220 Volts (ordered it from the US, should've thought more before doing it).
Is there some way I can power it with some batteries.
If so, how should I connect them, and is that a really horrible idea?
The AC adapter reads "output: 16VAC 500mA 8.0 W".

Would be glad if anyone could help me with this.

[Anonymous No.379815]

>I have been planning to buy some pretty strong LEDs for my computer case
>LEDs computer case

Nope

[Anonymous No.379820]

>>379815
Well, replying like this is not very constructive and is a waste of time for you and for me.
I'm asking you nicely to go somewhere else if you've got nothing that can actually contribute.
If you're upset that I want LEDs in my computer case, I'll tell you that it is for fun.
[spoiler]Deal with it/spoiler]

[Anonymous No.379832]

SOL on the transformer

>http://www.amazon.com/Yesurprise-50pcs-10mm-White-Light/dp/B0092X7TF0/ref=sr_1_7?s=hi&ie=UTF8&qid=1358892716&sr=1-7&keywords=Super+bright+led+10mm
Forward Voltage (V):DC3.2~3.4
Forward Current (mA):20

Using computah 12V as supply voltage:

the diode drops 3.3v. put 3 in series and they drop 9.9 volts.
they need a series resistOr to drop the remaining (12 - 9.9) = 2.1V

20mA is a max value, use 80% of this or 16mA

R = V / I = 2.1V / 16mA = 2.1/.016 = 131 ohms.

up this to a standard value of 150 ohms.
check:
2.1V/150ohms = 14mA = acceptable

so, use a 150 ohm resistOr and 3 LED's in series hooked to 12V (yellow wire to drives)
Can any one paste my post from the other thread I just closed an hour ago?(DAMN) or a link to archive?
I might use it to make a LED infographic since this is a common question.

[SiX No.379835]

Whatever you do be sure to have an on off switch. Nothing worse than bright led case lights in a dark room.

[Anonymous No.379839]

>Buying 9 of them
>50pcs in one order
Tell me, what do you plan on doing with 450 LED's? Make a Christmas tree out of your PC case? Well, hasn't been the strangest thing I've seen on 4chan.
Anyway, you'll be wanting to know what kind of power these babies will be using. Typically LED's run on DC, not AC power, so your VAC (Voltage AC) power output is not the right thing for this. Secondly, while your Arduino will be fine for this, hooked up in parallel (series requires a voltage equal to all LEDs combined), you need to make sure you know what voltage the LEDs are rated for, and hook them up to the appropriate voltage supply, whether it's a battery or a DC outlet. Typically, an extra volt or two will not kill your LEDs, but don't think a 12V battery is right for an LED that only needs 3 or something.
Go for it, there are 50 in a pack anyway...

[Anonymous No.379840]

>>379839
Oops, didn't read the amazon site properly.
Your post seems kinda hilarious when I think about it.
Thanks for the good reply

>>379832
Read through your post, copying most of it for future reference.
Thanks!