PWM
===============
Design uses IRLR024N NMOS as main PWM fet. It's sure is overkill for this project but since it's sponsor by Telok and it's free so why not. It's main features:

* Vds Max = 55V
* Id Max = 17A
* VGS(th) = min 1V Max 2V
* VGS Max= +/- 16V

FET's have basic 22 ohm serial resistor at gate and 10k ohm pulldown at side of processor.

.. image:: FET.png
  :width: 400
  :alt: FET

Some bulk capacitance are also added/channel for just in case if needed. They have not been assembled at PCB.

.. image:: pwm_bulk.png
  :width: 400
  :alt: Bulk capacitance for PWM
  
There is also protection diode/channel to protect FET's from inductive load spikes. Purpose of pinheaders is just to make easier to connect PC-fans to PCB.  

.. image:: inductive_protection.png
  :width: 400
  :alt: inductive protection diodes