03/31/2022
This is exactly what it says it is, a Pulse Width Modulation based fan controller specifically designed to work with 12v fans but can be scaled up to 24v with a DC wall wart.
The Kirbine contains two sets of logic, one 2 bit ADC made out of a data flip-flop package that was converted to toggle mode, and the 12 bit tachometer processor that reads out through an LED that blinks at the rate "R." T is the actual rate of the fans hall-effect tachometer sensor output. The aforementioned sensor is picking up on two signals per rotation, so more correctly the initial input is at most 1600Hz for a 200mm fan, which translates to 800Hz actual rotation cycles of the fan blades. The resulting logical end to the 12 bit binary division of this is .39Hz.
That last circuit I was simulating is now built into this design, and now I'm working with a PCB manufacturer to get a set of these built on a pick'n'place machine! It's looking like the cost should be around 30$ instead of my first design which would have costed 170$ to make.
