You did not mention reversing the fan direction, so it is not clear why you would need an H-bridge (like L293).
I certainly don't need nor want a reverse fan direction. It was an example I found which seemingly did what I seek, I'm pretty new to this so I'm not very familiar with what methods is needed for what applications. I just read up on what a H-bridge is and it is certainly not exactly what I need.
A simple power NPN transistor would seem all that is necessary to control the group of fans.
it is not necessarily the case that the Lamptron (and similar) controllers use voltage to vary the speed of the fans. It is more common to use PWM to control the speed of DC motors. Except for the case of fan motors which have a speed control input. But the fan you specified does not appear to have this option.
The Lamptron fan controller states:
- DC Input: +12v (Standard 4-Pin Connector)
- DC Output: 0-12v
So I am sure it does work by regulating the voltage, but I may be incorrect? But if they use PWM instead how do they control fans that does not have PWM support? The fan I specified works on the Lamptron fan controller.
True, the fan does not have PWM support standard.
You seem to already have the "how would I power" question answered. You said that they will be powered from a PC supply. OK
Ahh formulated wrongly, it was meant more for the wiring on the component (if different from the L293D).
The question "how I control the group of fans" seems almost as simple. Use a single power NPN transistor to switch the current to the fans. Either simple on/off, or using PWM to control speed (same circuit either way).
Can you guide/recommend one that can handle the load I started in the first post?