Circuit Diagram Temperature Sensor Thermistor Comparator .wmv

[muzicalman]

do you know if the circuit is supposed to default to on or off when the thermistor is disconnected?

[novax10]

can we change the PWM fan to an electric motor fan??

[wcaba001]

@novax10, This circuit is already being configured to drive an electric motor fan. I am not using PWM for this design. Depending on the current draw of your motor, that will determine what type of power transistor you should use for the application.

[jashianne]

may i ask if it is possible to connect the output to an analog to digital converter to 7 segments?

[wcaba001]

@jashianne, In this circuit the output from the comparator only has two states, either being pulled to GND or being pulled up to +12V power. I am assuming you are using the A-to-D converter and 7 segments to display a temperature reading like a digital thermometer. In this case you may want to consider having an A-to-D converter read the voltage coming from the Temperature_Signal output coming from the thermistor reference.

[natna25]

this is cool but why to you need a computer fan and will a small one work

[wcaba001]

Any fan should work, it is just an output that can be switched using the comparator.