i have some COM-08718 and COM-15200 for testing purposes. those are the old and new triple high power rgb leds respectively. im looking to hook them up to a pc’s typical 4 pin rgb connector. the four pins are 12v, red, green, and blue. im going to assume each color is the ground for that respective circuit. take the COM-15200 for example as thats probably the one i will use. it has r+, r-, g+, g-, b+, and b-. do you think i can just split the the 12v source to feed each positive with an inline resistor to drop the voltage down (i’ve done the math so not worried on the resistor end) and then feed each negative back to the corresponding colored pins so r- on board to r pin on connector? i want to be able to control these with my standard rgb control software. amps are not an issue as im using a splitter hub, just how to wire it.
That should work. Don’t forget to heatsink the LED and watch the resistor power ratings if you will be running them at high current.
/mike
thanks mike. the heatsink i got from mouser https://www.mouser.com/ProductDetail/585-SV-LED-214E . its the perfect size and pretty sure its over rated. attaching it might be the problem. most of the thermal glue/tape ive looked at has some awful thermal efficiency ratings, and the ones that are ok cost WAY too much for this one off deal. do you have any you would recommend? if not i might use my drill press and drill through one of those big pads and screw through with of course some thermal paste in between heatsink and the led backside. should still be usable to solder to. the resistors i got are all over rated. probably a little too high on some of the ohms in turning might make it a bit dim, but i think it should be fine for my project. thanks