Posted March 17, 2015 I know almost nothing about electrical wiring. But my idea is to put a 5mm led above my IO shield in the rear of my new case (phanteks enthoo pro) like nzxt has been doing on some of their cases. I think the io light is a cool idea. A white led I found is 3.2 volts, 20mA. Sata power has a 3.3 wire. Can I run just the 3.3v and ground to the led with an on/off switch? I guess I would need a 5 ohm resistor, which I found on radioshack.com. Here's a really terrible drawing I made to demonstrate. Can anyone let me know if I'm on the right track? CPU: Intel i5 4690k GPU: MSI GTX 960 OC PSU: Seasonic 750 Watt Mobo: MSI Z97S SLI Krait Edition Case: Phanteks Enthoo Pro White RAM: HyperX Fury 8Gb SSD: Intel 730 240Gb HDD: WD Black 1Tb Cooler: Phanteks TC12DX Mouse: Mionix Naos 7000 Keyboard: Ducky Shine 3 Monitor: Acer IPS 24" (x2) Link to comment Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted March 17, 2015 You can use an online calculator to find the needed resistance with it rounding to the closest standard resistor: http://led.linear1.org/1led.wiz System: Thinkpad T460 Link to comment Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted March 17, 2015 Author You can use an online calculator to find the needed resistance with it rounding to the closest standard resistor: http://led.linear1.org/1led.wiz Ok, it says I need a 5 ohm resistor. I found 10 ohm resistors, which should be fine. But do I need to wire it a certain way.. does the switch need to go on the ground wire? or both? CPU: Intel i5 4690k GPU: MSI GTX 960 OC PSU: Seasonic 750 Watt Mobo: MSI Z97S SLI Krait Edition Case: Phanteks Enthoo Pro White RAM: HyperX Fury 8Gb SSD: Intel 730 240Gb HDD: WD Black 1Tb Cooler: Phanteks TC12DX Mouse: Mionix Naos 7000 Keyboard: Ducky Shine 3 Monitor: Acer IPS 24" (x2) Link to comment Share on other sites More sharing options... Link to post Share on other sites More sharing options...
Posted March 18, 2015 Ok, it says I need a 5 ohm resistor. I found 10 ohm resistors, which should be fine. But do I need to wire it a certain way.. does the switch need to go on the ground wire? or both? Nope, you can just have it on the Positive wire. He is an example: You will not need a fuse unless you really want to put one in. It will only protect the LED's/Resistor from breaking if there is a huge power surge, but the PSU sorts that out so you will not need one. CPU: i5 4670k @ 3.4GHz + Corsair H100i GPU: Gigabyte GTX 680 SOC (+215 Core|+162 Mem) SSD: Kingston V300 240GB (OS) Headset: Logitech G930 Case: Cosair Vengance C70 (white) RAM: 16GB TeamGroup Elite Black DDR3 1600MHz HDD: 1TB WD Blue Mouse: Logitech G602 OS: Windows 7 Home Premium PSU: XFX Core Edition 750w Motherboard: MSI Z97-G45 Keyboard: Logitech G510 Link to comment Share on other sites More sharing options... Link to post Share on other sites More sharing options...
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