12 Volt DC Fan Temperature Control

Posted on Feb 6, 2014

Here is a simple circuit based on two transistors that can be acclimated to ascendancy the acceleration of a 12 V DC fan depending on the temperature. A thermistor (R1) is acclimated to faculty the temperature. When the temperature increases the abject accepted of Q1 (BC 547) increases which in about-face decreases the beneficiary voltage of the af

12 Volt DC Fan Temperature Control
Click here to download the full size of the above Circuit.

orementioned transistor. Since the beneficiary of Q1 is accompanying to the abject of Q2 (BD 140), the abatement in beneficiary voltage of Q1 advanced biases the Q2 added and so do the acceleration of the motor. Also, the accuracy of the LED will be proportional to the acceleration of the motor.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Audio booster
    Ir Pulse To Audio Converter Circuit
    LED Flasher Circuit Using 555 Timer IC Schematic Diagram
    Spice Component Circuit Modeling and Simulation
    rf module based remote control
    MAX668 16V 4.4A switching power supply circuit design electronic project
    transformerless low cost power supply
    Boost Converter Design
    Flasher Circuits
    RC Servo Processor