Hi, for a school project i am planning to make a circuit that will turn a computer fan on when the temperature reaches a certain level, or control of the speed of the fan in accordance to the temperate if possible.
I have done some research into it and have found 2 possible circuit designs:
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or
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I plan to connect it to a seperate power supply (not my computers PSU) to minimize risk. Are either of these circuits what i'm looking for? Which would be more practical?
Any advice or help greatly appreciated, thanks