Arduino Mega 2560 R3 PWM Frequency Control


hi, have 4-pin fan can controlled pwm control speed. need operate @ 25khz.
also +2 pins need them motor pwm control same frequency, lets 4khz.

i need information regarding how control arduino's pwm pins.
from googled, there 16bit timers , 8bit timers. mega 1 which?
what timers responsible pins?
and timer arduino code uses delay , millis functions?
from google's searchings became complicated real quick. there 2 modes timer seems... , there different prescaler values each timer. different equations of course. , there "top" variable....

can me sort confusion? :smiley-red:
i'm tired these "secrets" modes , happier if put or redirect me info on same place. , in orderly manner won't confused. please. hope don't ask lot.

just give analogwrite try rare need adjust advanced stuff pwm work stuff that.


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