AVR microcontroller based PWM fan controllers

  
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So this is a bit of a continuation on my 555 timer based PWM controllers, but now using microcontrollers and MOSFETs instead of 555 ICs and transistors. I made 2 versions, one with switches for speeding up and down and the other with a potentiometer like the previous controllers. I used ATtiny25 controllers running at.
AVR microcontroller based PWM fan controllers - schematic




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