Airflow Detector Circuit Diagram
Simple Electronic Applications December 6th, 2009This circuit diagram is used to give a visual indication of the rate of air flow. It used a filament L1 for the sensor, the filament L1 can be made by removing the glass of a 40W incandescent bulb. When there is no air flow, the resistance of the filament will be low. When there is a air flow, the resistance will be drop because the moving air will remove some of the heat generated in that filament. This variation of resistance will produce variation of voltage across the filament. These variations will be picked up by the opamp LM339 and the LED brightness as its output will be varied proportionally to the air flow. R4 POT is used as voltage reference in opamp, set its value to set the sensitivity of the circuit.
source : www.circuitstoday.com
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March 21st, 2010 at 1:12 pm
Sir i need more information of operation of this circuit, kindly provide the required information. Thank you.
March 21st, 2010 at 4:21 pm
what kind of information do you want sir? Rgds
March 27th, 2010 at 3:53 pm
I was wondering if you could help me out, i want to expand this to include an ADC and a 7-segment display, can you give me some assistance with a schematic for this?
July 5th, 2010 at 5:10 am
Hi. I like the way you use a 7805 to regulate the heat. What is the voltage and filliment resistance of your 40W L1 please?
January 24th, 2012 at 5:01 am
can i replace LED with 7-segment display
January 25th, 2012 at 6:27 am
Yes you can.
Regards