Using a 741 op-amp I’m testing the voltage drop across A 1k Ohm thermistor, TDC05C210 [RSR-21T1K]. Using a 1K Potentiometer and its wiper arm to set the threshold or temperature that were detecting for. I got it set to trigger off the red light and turn on a fan at around 80 degrees Fahrenheit or 26.66 degrees Celsius. The output turns on a NPN transistor which then allows power to be supplied to the 12 fan.
Post time: Jun-06-2017