![](https://4.bp.blogspot.com/-TKkHCuVjkuQ/V00V-eJ7hYI/AAAAAAAACUw/Cj0JFT7BLiY_DwQySJxXUW4DMF5miNBQgCK4B/s400/DC%2BMotor%2BFan%2BMonitoring.png)
Rsense = Sensing Fan Current
R1 & C1 = Establish an average DC level at the mid point of the transistor of the current waveform and apply this voltage to the base of Q1
This DC motor/fun failure detector checks for the fluctuation in current through Rsense. A static current causes the output to go high, indicating a failure.
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