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wiring leds to your psu - Page 2

post #11 of 16
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well this is what i have. i have a little molex i ripped off of an old led fan, lol. heres a pic


does this mean i can just cut off the red and black wire that is next to the red? if all i need is the yellow and black for the 12 volts.

i also have a connector from my psu that looks like this,


do i just cut off the molex and wire the black and red straight to the led strip with the resistors, etc?
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post #12 of 16
Quote:
well, the LED's drop about .7 Volts each, so you could power up to 17 LED's with a 12V source. The resistor is there to take up any of the voltage that the LED's don't use.
-depends on the wattage rating and voltage input for the LED's.

I have 4 x 7v LED's running on a 12v input to a trimmer, 7v-12v adjustable..they really shine at 12v!

Quote:
do i just cut off the molex and wire the black and red straight to the led strip with the resistors, etc?
yes that will work fine!
post #13 of 16
Where could someone (myself) buy some Female molex connectors, since i dont have any old fans lying around and all
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post #14 of 16
No need for moldex connectors, use the previously mentioned set of 4 3v leds in series, then just parallel the strands of 4 together. No need for a diode, since the LED is a (Light Emiting Diode) Polarity is very important, pay attention to the + & - and wire them in series. As for connecting them to the ps wires, goto the local autoparts shop and get some 3m t-taps (blue) and (blue) crimp quick disconnect. The volt drop listed b4 is only in the circuit of lights, the Led's will pull very low amps, so running 24 3v led's off our the computer's PSU will be no problem.
http://cgi.ebay.com/3M-T-Taps-Blue-1...QQcmdZViewItem
http://www.autotoys.com/x/cust/produ...?productid=531
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post #15 of 16
Quote:
Originally Posted by gonX View Post
You could use a diode instead

Ummm...no, you couldn't. Diodes drop a certain amount of voltage. A resistor can drop the rest of the voltage, no matter how much voltage it is. Adding a diode would be the same as adding another LED to the string, and then your LED's just start getting dimmer.
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post #16 of 16
Quote:
Ummm...no, you couldn't. Diodes drop a certain amount of voltage. A resistor can drop the rest of the voltage, no matter how much voltage it is. Adding a diode would be the same as adding another LED to the string, and then your LED's just start getting dimmer.
If you wanted to run them at 9v instead of 12v...you would either have to add more LED's...or a resistor in-line to trim the voltage..i guess another diode would work too.
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