Thursday, January 26, 2017

Circuit Schematic Air Flow Detector using LM339 IC

Eltronicschool. - One the electronic detector circuit that will help you to create one airflow detector using the popular IC LM339 IC.

In this time, based on LM339 IC, we will give you one of electronic circuit schematic of Air Flow Detector using LM339 IC like in Figure 1. below.

Circuit Schematic

Figure 1. Circuit Schematic of Air Flow Detector using LM339 IC (Source: Circuitstoday)

Component Part
  1. LM7805 IC
  2. Variable Resistor
  3. Resistors
  4. LM339 IC
  5. LEDs
  6. Capacitors
  7. Filament
Description

Circuit schematic like in Figure 1 above is Air Flow Detector using LM339 IC. this circuit can give a visual indication of the rate of air flow.It can be also used to check whether there is air flow in a given space.

How it works

According Circuitstoday site describe this circuit can give a visual indication of the rate of air flow.It can be also used to check whether there is air flow in a given space.

The filament of a incandescent bulb is the sensing part of the circuit.When there is no air flow the resistance of the filament will be low.When there is air flow the resistance drops , because the moving air will remove some of the heat generated in the filament.This variations in the resistance will produce variation of voltage across the filament.These variations will be picked up by the opamp (LM339) and the brightness of the LED at its output will be varied proportionally to the airflow.


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