Air Flow Detector


Posted on Jan 19, 2013

This simple circuit uses an incandescent lamp to detect airflow. With the filament exposed to air, a constant current source is used to slightly heat the filament. As it is heated, the resistance increases. As air flows over the filament it cools down, thus lowering it`s resistance. A comparator is used to detect this difference and light an LED. With a few changes, the circuit can be connected to a meter or ADC to provide an estimation on the amount of air flow.


Air Flow Detector
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Cell Phone Battery Meter 3.6 Volt
Circuit-break locator for the holidays
Compact Switching Step-Down Converter By MAX639
Thunderstorm Predictor
SIMPLE CONTINUITY TESTER CIRCUIT
Fire siren
Using STK3048 and STK6153 practical circuit
The reference voltage of the symmetrical bipolar comparator



Top