Wind Meter Anemometer

This is series of simple wind gauge (anemometer). This circuit can measure wind speeds up to 75m / s using this circuit.

Transistors Q1 and Q2 are used to feel the wind.Thermal impedance between the transistor and
the surrounding wind velocity used here. Transistors Q1 and Q2 are wired so that a higher VCE of Q1 from Q2 and therefore there will be a higher power dissipation. The wind causes the cooling so that Q1 VCE of changes. Ended at different power dissipations and different voltages R10. Variations to produce Vout which is proportional to wind speed. For still air will Vout 0V and at 75m / s wind speed will Vout 2.5V. A voltmeter FSD 3V Vout connect through the terminal and ground can be used as a screen.

 

Click image for full image

To work properly, air must pass through the two transistors (Q1 and Q2).

Resistors are not used are standard values. So, you should use a combination (serial or parallel) resistors to achieve certain values.