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

Digital lighting controler PIC16F870
18 LED sequencer timer
LED Emergency Light Circuit With Battery Over Charge Protection
60W Amplifier
IR Remote Control Modulation Detector
Phono Preamplifier
FUZZ_CIRCUIT
Massage digital display circuit



Top