Unbelievable Dc Fan Circuit Diagram

However for optimum performance it may become necessary to slightly change the values of components c1 r4 and c2.

Dc fan circuit diagram. Thermistor ntc 10kω. Circuit diagram showing a dc fan control. Resistors 4 7kω 39ω each one.

You can use this circuit in many electronic projects which require a cooling fan. Operational amplifier ic lm741. Connecting a relay for controlling bigger fans.

By using this circuit you can control the speed of dc fan by tuning the potentiometer volume control variable resistance. In this circuit pin 3 non inverting terminal of op amp 741 is connected with the potentiometer and pin 2 inverting terminal is connected in between of r2 and rt1 thermistor which is making a voltage divider circuit. It works on the principle of thermistor.

Tested at 12v 1a dc fan. The led turns on when the preset threshold level reached and also turns on the fan. However two fans.

How temperature controlled fan circuit diagram works the picture shown below is a basic temperature controlled fan circuit utilizing lm35 temperature sensor lm358 op amp and a 5v relay module. You can use almost all standard 3 wire cooling fans with this adapter circuit. This circuit can cool your heat producing electronic gadgets by working with a dc fan.

The red cable goes to the positive of the power supply vcc and the black to the negative gnd. Here is some circuit diagram of dc fan regulator using pwm method. Let me start describing the design of the temperature control switch circuit with the op amp lm358.