AIR Flow Detector - This simple circuit uses an incandescent lamp to detect airflow. Withfilament exposed to air, a constant current source is used to slightly heatfilament. As it is heated, resistance increases. As air flows overfilament it cools down, thus. __ Designed by Aaron Cake
AirfLow Monitor Protects Components - 09/28/95 EDN Design Ideas: Many electronic components, including fourth-generation µPs, require forced-air cooling. However, the reliability of electromechanical components, such as cooling fans, lags behind that of electronic devices. Even if a fan does not fail, blockage of the air-intake vents can reduce airflow. The circuit in Fig 1 helps you protect against high-temperature-induced system failures by monitoring the performance of the cooling system Design by Wes Freeman, Analog Devices, Santa Clara, CA
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