| Electronics > Beginners |
| how to pull 12v from PSU on PC? |
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| ddmeltzer8:
Hello. Im wanting to pull 12v for 1)fan controller(1-1,5A) 2)LED strip-5630 1 meter from the PSU.Im completely prepared to cut and solder.I just dont know what wires to cut... Thanks in advance. |
| mariush:
Molex and SATA connectors have 12v and 5v in them The lower voltage is towards the center of a device (ex hdd). For sata, you have 3.3v by the SATA data cable, then 5v and 12v on the other side. For molex, you have 5v on the side with the SATA or IDE data cable, 12v on the other side. If your psu cables are colored: orange is 3.3v, red is 5v, yellow is 12v, black is ground (com, common) . You don't have to cut cables. You could just buy a molex to sata or sata to molex extension cable and cut one of the connectors. ex molex to 2 x sata : https://www.newegg.com/p/N82E16812422786?Item=N82E16812422786 https://www.newegg.com/p/N82E16812422643R?Item=N82E16812422643R sata to molex+floppy : https://www.newegg.com/p/N82E16812422644 So you can just cut one of the connectors and you get your exposed wires. |
| digsys:
--- Quote from: mariush ---You don't have to cut cables. You could just buy a molex to sata or sata to molex extension cable and cut one of the connectors. --- End quote --- You can pick up all sorts of adapters / converters / dead or cheap P/Supplies from computer swap meets |
| beanflying:
Way back in the dim dark past I did this hack on an old PSU I had laying around. +-12V rails 3.3 and 5V and a hard switch as it needed one from the motherboard to wake up. Doesn't get much use now due to much better PSU's but it was handy at the time and still occasionally gets powered up as it is easier than lugging around 10kg of bench supply. The short answer for the OP is Yellow is +12V and black is ground as shown in the diagram above :) |
| mariush:
There's only two wires on fan which are 12v and ground. The others are rpm sensor and pwm signal and both are optional. Pinout is ground, voltage, rpm , pwm tack See https://allpinouts.org/pinouts/connectors/motherboards/motherboard-cpu-4-pin-fan/ See https://allpinouts.org/pinouts/connectors/motherboards/motherboard-cpu-3-pin-fan-connector/ No it doesn't matter which 12v wire and which GND wire from the PSU gets connected to CPU 12v and GND wires. |
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