12 volt dc fancontrol2/24/2023 ![]() Op-amps have large gain and usually used as Voltage Amplifier. And if the voltage of inverting input (-) is Higher than non-inverting end (+), then output is LOW. When voltage at non-inverting input (+) is higher than the voltage at inverting input (-), then the output of comparator is High. ![]() Op-amp basically has Voltage Comparator inside, which has two inputs, one is inverting input and second is non-inverting input. The main function of this IC is to do mathematical operation in various circuits. In Op-amp IC 741 PIN2 is an inverting input terminal and PIN3 is non-inverting input terminal. An operational amplifier IC is used as a comparator which compares the two signal, the inverting and non-inverting signal. Op amp IC LM741Īn operational amplifier is a DC-coupled high gain electronic voltage amplifier. We also used Thermistor in many interesting applications like Fire alarm circuit using Thermistor, Temperature Controlled AC, Thermistor Based Thermostat Circuit.Īll the thermistor based projects can be found here. NTC thermistor is a resistor whose resistance decreases as rise in temperature while in PTC it will increase the resistance as rise in temperature. There are two types of thermistor NTC (Negative Temperature Co-efficient) and PTC (Positive Temperature Co-efficient), we are using a NTC type thermistor. Thermistor is temperature sensitive resistor, whose resistance changes according to the temperature. The key component of this temperature controlled fan circuit is Thermistor, which has been used to detect the rise in temperature. Required Componentsīelow components are required for this Automatic Fan Controller using Thermistor:īelow is the circuit diagram for Temperature Controlled Fan using Thermistor as Temperature Sensor: We have previously made the Temperature controlled Fan using Arduino, where the speed of the fan is also controlled automatically. This whole process is done automatically. “Automation is good, so long as you know exactly where to put the machine’’, In this tutorial we are making a Temperature controlled DC fan using Thermistor, as it starts above the preset level of temperature and stops when the temperature return to normal condition. ![]()
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