Help creating a simple power supply circuit

[AgentCOPP1]

[Help] creating a simple power supply circuit

Hello everyone. This is my first post here so don't make fun of me haha. I have a Playstation 4 (gaming console) in a very tight space in my computer area. I've been using a USB fan that I made from an old Xbox 360 to help provide some ventilation but it needs a little bit more because it's still getting fairly hot. The Xbox fans I have on there now seem to work pretty well with the 5v supply of the USB, but I have two more 12v computer fans that I want to use as well. Problem is that they don't work very well on the 5v power supply (not surprisingly) and barely push any air whatsoever. So what I want to do is design a circuit that's powered from a 7v wall wart and only supplies power to the fans when it senses voltage through the USB (meaning that the PS4 is on). I also want it to have USB outputs so I can easily take the fans out of it (I want it to be USB instead of the standard circular power jack just because one of the fans I want to use is already attached to a USB plug).

This is a schematic of what I'm wanting:

7v---------->|Circuit board|======>7v 2 fans

PS4 USB going to circuit board.^

The fans shouldn't draw any more than 1 amp of current if that matters. I'm just learning about circuits and everything so if you could help me out, I'd greatly appreciate it. I am very proficient at soldering so that's not a problem.

 

[shahbaz.ele]

Re: [Help] creating a simple power supply circuit

dear your computer supply must have a 12V output,
why you do not use that supply to run the fans.

 

[AgentCOPP1]

Even though the fans are rated for 12v, I don't use that because it makes the fans run too fast. 7v makes the fans run at the perfect speed for what I need.