Tuesday, August 16, 2016

Circuit Schematic Heat Activated Cooling Fan Controller using LM35 Temperature Sensor

Eltronicschool. - One the temperature sensor is to detect heat and cool of the device that can open the heating. One of the popular temperature sensor that used in electronic project is LM35D that will give different voltage output according the temperature change. With using Op-Amp IC like LM385 as inverting system use, we will can build the circuit of heat activated cooling fan controller like in Figure 1 below.

Circuit Schematic

Component Part

  1. LM35D Temperature Sensor
  2. LM358 IC
  3. Resistors
  4. LED
  5. Diode
  6. Capacitors
  7. Variable Resistor
  8. C828 Transistor
  9. D400 Transistor
  10. DC Fan Motor
Description

Circuit schematic like in Figure 1 above is Circuit Schematic Heat Activated Cooling Fan Controller using LM35 Temperature Sensor. As published by Electronics-Lab site describe that heat activated cooling fan controller is a simple project which operates a brushless fan when the temperature in a particular area goes above a set point, when temperature return normal, fan automatically turns off. The project is built using LM358 Op-amp and LM35 temperature Sensor. Project requires 12V DC supply and can drive 12V Fan. This project is useful in application like Heat sink temperature controller, PC, heat sensitive equipment, Power supply, Audio Amplifiers, Battery chargers, Oven etc

The SMD SO8 LM35 used as temperature sensor, LM358 act as comparator and provides high output when temperature rise above set point, high output drive the Fan trough driver transistor. The LM35 series are precision integrated-circuit temperature devices with an output voltage linearly-proportional to the Centigrade temperature. The LM35 device has an advantage over linear temperature sensors calibrated in Kelvin, as the user is not required to subtract a large constant voltage from the output to obtain convenient Centigrade scaling. The LM35 device does not require any external calibration or trimming to provide typical accuracy of ±¼°C at room temperature. Temperature sensing range 2 to 150 centigrade. LM35 provides output of 10mV/Centigrade.

So, you can using electronic circuit schematic like in Figure 1 above to build by your self Heat Activated Cooling Fan Controller using LM35 Temperature Sensor.


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