![]() When the temperature rises, Fan will automatically switch on. Then adjust VR till the Fan stop running. Controller for 4-pin PWM fans that can both work what its anchor for manual speed reduction and far work in tandem with the automatic motherboard fan control. Automatic fan speed control mode controls system cooling based on measured. ![]() Switch on the amplifier for 5-10 minutes. Automatic temperature controller for various applications ijariie. Capacitor C1 gives a short lag before Q1 turns on to avoid false triggering of the transistor and to give proper bias to Q1.Īttach the Thermistor as possible as near the Heat sink of the Amplifier PCB. This drops the voltage at pin 2 of IC and its output becomes high and then Transistor Q1 gets on and fan turns on. Output of IC (U1) will be low and the Fan remains off in this case.Īnd when temperature increases near the Thermister, The resistance of its decreases. VR (R1)is adjusted to give a slightly lesser voltage at the non-inverting input than the inverting input at normal room temperature. Resistor R1 ( VR) And R2 form one potential divider connected to the non-inverting input of IC (U1) and another potential divider comprising R3 and the 4.7K Thermister supplying a variable voltage to the inverting input of IC1. The resistance of NTC Thermister reduces when the temperature in its vicinity increases.Ī voltage comparator ic is used to compare its input voltage at pin 2 and 3 which is varied by thermister (as per temperature rises) with two potential dividers. The circuit uses an NTC (Negative Temperature Coefficient) Thermister to sense heat.
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