Molex fan hub power switch 12V-7V

[Justux204]

Hello need some help witch switch wiring, sound simple but is not for me, with that kinda stuff i'm like a spongebob joke about squirrels.

by switch i mean this https://imgur.com/a/SY2pa

Iam runing 6 fan, with (6pin fan) so cant use those adaptors from ebay https://imgur.com/a/481Fh

So i need to add switch that i could use whenever i want becouse fans at full speed are damn loud... as right now my fan setup looks like this https://imgur.com/a/xOksv

real foto

I asked on other forum for help they drawed this https://imgur.com/a/FhOS0 dont know is this good couse other members said that this is just shorting 12V with 5V

Can somebody tell me what kinda switch i need to use (with how many contact points 3-4-5-6 etc) and draw a schema how to conect them on this https://imgur.com/a/xOksv, i will do all mods on that sata to molex adaptor

(posting this between forum need solution as fast as possible)

 

[CountMike]

Black and Yellow = 12v
Read and Yellow = 7v, schematic in that last picture should work.
Red wire from the hub should go to middle (Common) connector on the switch and RED form PSU cut and connected to one side of the switch, same with Yellow one.

 

[Paperdoc]

In the picture with all the colored arrows added there is a mistake. The YELLOW arrow furthest left should NOT be there at all, because it does short together the +7V and +12 V supplies from the Molex plug. IF you delete that wrong connection, then the switch WILL give you two voltage (and hence fan speed) options: 12V or 5 V. BUT that does have a couple problems: some fans can't start up on 5 VDC, and even it it works there is a LOT of difference between the two speeds.

You asked how to arrange to switch between 12V and 7 V, which makes more sense. People do this by arranging to keep the +12 VDC connection from YELLOW constant, and change (via switch) whether the GROUND feed to the fan is from the Black (really Ground) wire of the Molex, or from the RED +5VDC wire. That difference gives you 7 VDC to the fan.

WARNING: doing this may be a real problem for that box you have - a Hub of come sort that also feeds to LED's, by its labels. PLUS it has some provision for other connections (an IR remote control?). So whatever else it is doing beyond feeding voltage to fans may not work or MAY actually be damaged if you switch its Ground connection point from real Ground (0 VDC) to +5 VDC.

With that warning, you could arrange to switch between 12 and 7 V in this way. All wiring changes to be done on the wires between the SATA and Molex plugs.
1. Cut both black leads. Take the two from the PSU end (SATA connector) together to one END terminal of the switch. Take the two from the Molex end both to the CENTER terminal of the switch.
2. Cut the RED wire. Take the end from the SATA connector to the other end terminal of the switch. Do not connect the Red wire stub from the Molex connector to anything - just ensure it is insulated.

With this setup the Hub will receive the +12 VDC supply from the Yellow wire at all times. The switch will allow you to choose whether the Hub's Ground line (from the two black leads between switch center and Molex) is connected to the real Ground (black wires from the SATA connector) or to the +5 VDC supply (Red wire) from the SATA connector.

 

[Justux204]

In the picture with all the colored arrows added there is a mistake. The YELLOW arrow furthest left should NOT be there at all, because it does short together the +7V and +12 V supplies from the Molex plug. IF you delete that wrong connection, then the switch WILL give you two voltage (and hence fan speed) options: 12V or 5 V. BUT that does have a couple problems: some fans can't start up on 5 VDC, and even it it works there is a LOT of difference between the two speeds.

You asked how to arrange to switch between 12V and 7 V, which makes more sense. People do this by arranging to keep the +12 VDC connection from YELLOW constant, and change (via switch) whether the GROUND feed to the fan is from the Black (really Ground) wire of the Molex, or from the RED +5VDC wire. That difference gives you 7 VDC to the fan.

WARNING: doing this may be a real problem for that box you have - a Hub of come sort that also feeds to LED's, by its labels. PLUS it has some provision for other connections (an IR remote control?). So whatever else it is doing beyond feeding voltage to fans may not work or MAY actually be damaged if you switch its Ground connection point from real Ground (0 VDC) to +5 VDC.

With that warning, you could arrange to switch between 12 and 7 V in this way. All wiring changes to be done on the wires between the SATA and Molex plugs.
1. Cut both black leads. Take the two from the PSU end (SATA connector) together to one END terminal of the switch. Take the two from the Molex end both to the CENTER terminal of the switch.
2. Cut the RED wire. Take the end from the SATA connector to the other end terminal of the switch. Do not connect the Red wire stub from the Molex connector to anything - just ensure it is insulated.

With this setup the Hub will receive the +12 VDC supply from the Yellow wire at all times. The switch will allow you to choose whether the Hub's Ground line (from the two black leads between switch center and Molex) is connected to the real Ground (black wires from the SATA connector) or to the +5 VDC supply (Red wire) from the SATA connector.

https://imgur.com/8EKOVxs something like this?, you are right about lights, 5V powers only RGB light, tried doing manual switching, when only GRD and 5V was connected fans don't spin, only lights worked, but then changed to 7V fans spined light didn't work. My idea to go around this is https://imgur.com/a/uoBDh

 

[Paperdoc]

I have no idea whether that might work. You are assumi9ng that the two Black lines for Grounds from the Molex connector are DIFFERENT, and that each is related to the nearest + DCV line. I don;t think that is so - I think the two Grounds are connected together.

The Hub you have obviously is intended as a connection hub for two types of uses. One is the 12 VDC for fans, the other is the 5 VDC for LED's, and both are obtained from a PSU output. But now you are trying to add a feature - the ability to change the 12 VDC supply line for the fans - so that you can force them to run more slowly and quietly. There are better ways to do that. But they depend on the details of the hardware you have. So, post back here with this info and we can advise another approach.

1. Motherboard - maker and exact model number.
2. Case fans only - how many, and what maker and exact model number for each. If you can;t tell that, at least tell us whether each fan has 3 wires or 4 coming from it to its connector.
3. CPU cooling system - maker and model number of the fan, CPU cooler, or whatever else you are using.

With that we can advise how best to use the abilities already in your mobo for automatic control.

 

[Justux204]

I have no idea whether that might work. You are assumi9ng that the two Black lines for Grounds from the Molex connector are DIFFERENT, and that each is related to the nearest + DCV line. I don;t think that is so - I think the two Grounds are connected together.

The Hub you have obviously is intended as a connection hub for two types of uses. One is the 12 VDC for fans, the other is the 5 VDC for LED's, and both are obtained from a PSU output. But now you are trying to add a feature - the ability to change the 12 VDC supply line for the fans - so that you can force them to run more slowly and quietly. There are better ways to do that. But they depend on the details of the hardware you have. So, post back here with this info and we can advise another approach.

1. Motherboard - maker and exact model number.
2. Case fans only - how many, and what maker and exact model number for each. If you can;t tell that, at least tell us whether each fan has 3 wires or 4 coming from it to its connector.
3. CPU cooling system - maker and model number of the fan, CPU cooler, or whatever else you are using.

With that we can advise how best to use the abilities already in your mobo for automatic control.

https://imgur.com/8EKOVxs These fans are some chinese knockoffs 😀 https://www.aliexpress.com/item/6pcs-Computer-Case-PC-Cooling-Fan-RGB-Adjust-LED-120mm-Quiet-IR-Remote-New-computer-Cooler/32839035135.html so i wont be able to connect them to motherboard, cause they also use 6 pin connector. https://imgur.com/a/skQ5Z

 

[Paperdoc]

You are right. That's a whole set of components that provides power to all the fans plus a variety of LED light displays controlled using the IR remote control unit. My GUESS is that the non-standard 6-wire connection between the Hub and each fan contains 4 wires for the LED's, plus two for the DC supply to the fan motors. This system does all control by itself, and does not provide a way to use mobo controls.

Check something. Look through the instructions for the system thoroughly. I see that the IR remote control module has two buttons labelled "S+" and "S-". In an illustration for another product by this maker the instruction sheet talks about "10 levels of speed". I don't know whether that refers to the ability to change the speed of LED display changes, or to set the speed of the fans. MAYBE those buttons will alter your fan speeds. This would be manual control, not mobo-based automatic, but it might let you do what you want.