Home made PWM adapter?

[samuel]

Hello guys. Found this:

And I want to make one for myself. I don't wanna buy one no matter how cheap it would be. All I have is a 4 pin fan connector, cables , electrical tape and guts. Can anyone post a diagram or something so that I won't short out my motherboard? It's a fan splitter with PWM control on the motherboard and PSU powered at the same time.

[Lyons]

Yellow = 12v

Black1 = gnd

Black2 = gnd

Red = 5v

 

If you want 5v, wire the fan connectors to the red molex wire and either black one.

 

If you want 12v, wire the fan connectors to the yellow molex wire and either black one.

 

If you want 7v, wire the fan connectors to the red molex wire and the yellow one.

 

It'll be really hard to make proper disconnect-able fan connecters without real plugs, but you could do it. I've made heaps of 7v adapter using fan cable extensions that I've cut up. It's very hard to damage your PSU doing this if you have at least very basic circuit knowledge.

 

If you don't have any fan connectors, I suggest you just buy some adapters. They're like $5 for molex > 3x adapters.

[SLPNTIM]

sticky this. wait a minute this is not the best place! so mods please move accordingly and sticky please

[samuel]

Yellow = 12v

Black1 = gnd

Black2 = gnd

Red = 5v

 

If you want 5v, wire the fan connectors to the red molex wire and either black one.

 

If you want 12v, wire the fan connectors to the yellow molex wire and either black one.

 

If you want 7v, wire the fan connectors to the red molex wire and the yellow one.

 

It'll be really hard to make proper disconnect-able fan connecters without real plugs, but you could do it. I've made heaps of 7v adapter using fan cable extensions that I've cut up. It's very hard to damage your PSU doing this if you have at least very basic circuit knowledge.

 

If you don't have any fan connectors, I suggest you just buy some adapters. They're like $5 for molex > 3x adapters.

Thanks for response but I already know this. I was reffering to PWM Software control within Speedfan for like 8 fans in one  4 pin connector. 

[Morfy]

That may fry your motherboard fan header, or simply not work. And using molex at the same time for aditional power won't work, because the Pulse Width Modulation signal used to control the fans is from the motherboard, and a molex can't do that.

[Morfy]

http://pc-coolers.ro/cabluri-adaptoare/cablu-splitter-pwm-akasa-flexa-fp5s-ak-cbfa07-45---3411

[Dark_Nemesis]

That may fry your motherboard fan header, or simply not work. And using molex at the same time for aditional power won't work, because the Pulse Width Modulation signal used to control the fans is from the motherboard, and a molex can't do that.

Nope, sorry man but I believe you're incorrect! 

I don't want to sound like a know-it-all, I just try to avoid misinforming people, and if you can prove me wrong I will not be offended

[Dark_Nemesis]

Just to make some things clear for peaople in the future reading this thread.

 

As long as you get the wiring correct, the way you plan to do this is the correct way, and you will NOT fry any fan headers on your mobo. That's what the molex power connector is there for, it's feeding power to the fans, while all the cable to the fan header does is to provide the pwn signal to the fan, and the tach signal to the mobo. 

The PWM signal is only a voltage signal (it has very little amperage), which is why it can safely be splitted.  =)

[Dark_Nemesis]

Have you gotten anywhere with your problem? 

 

The only problem that you may encounter with the PWM splitting is that the RPM reading for the fans may go off the charts, not sure how this affects speedfans ability to control them, since I haven't been using speedfan since the good old 3-pin fan days

Have you tried your cable at all, or did you get spooked by previous comments on fried fan headers? 

 

Here's a video on controlling fan speeds with speedfan, if you haven't seen it already: 

 

https://www.youtube.com/watch?v=8VjdQStihsE

 

 

Just to clarify, since you only have one PWN signal, from each PWM header, you can't control different fans connected to a single fan header individually.