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Basic DC Fan Speed Circuit
A simple Darlington Transistor circuit for controlling the speed of a DC Brushless fan (12 volts). Requires a PWM (Pulse Width Modulation) input. I use and Arduino UNO for this PWM input but any Microprocessor can be used. You can even use a 555 or 556 timer circuit.
For the sake of this simple circuit the Darlington Transistor TIP120 can be thought of as a MOSFET transistor.
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Uploaded on Feb 19, 2012
DC Fan Speed Circuit Breadboard
Basic layout of the DC Fan Speed control circuit on a small breadboard.
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Uploaded on Feb 19, 2012
Overview of Complete Project - DC Fan Speed Circuit
The DC Brushless Fan (12V) for the DC Fan Speed Control Circuit
Note the shiny fan blade as about 9 oclock. This is a piece of metallic tape on one blade. This makes noticing the fan speeding up and slowing down much easier.
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Uploaded on Feb 19, 2012
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