12v Fan Temperature Control Circuit

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12v fan temperature control circuit.

By using this circuit you can control the speed of dc fan by tuning the potentiometer volume control variable resistance. To detect the temperature we have used a 10k ntc thermistor. It requires only two transistors a few resistors thermistor and small 12v fan. Tested at 12v 1a dc fan use at least 470k pot vol control potentiometer to set the required speed.

This circuit has plenty of applications in electronic projects which require a cooling fan. Here we are going to demonstrate a simpler version of a temperature controlled dc fan. The necessary hardware items required for temperature controlled fan. This is perhaps the simplest implementation of a temperature controlled fan.

While performance is not quite as good as other op amp implementations it is a very interesting experiment. The fan is operated by a 08m2 output bit c 4 connected to the gate of q1 an irl540 n channel power mosfet. It is a resistance thermometer its resistance changes inverse proportionally to the temperature. Schematic of the temperature controlled fan circuit.

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. By saum hadi posted on november 6 2018. Its operation is fully automatic and turns off when the temperature returns normal. I would like to introduce the concept of the temperature controlled on off relay circuit.

It uses a small 12v dc brush less fan used in computers. You probably know that useful fan when the weather is hot. Working of automatic temperature controlled fan using thermistor. You can control any 12 volts 1a dc fan with this circuit according to the temperature changes.

Q1 is used in a low side driver configuration such that it will sink the fan s current when the voltage of the gate relative to its source pin which is at ground is increased by just a few volts. These circuits are based on 555 timer. 12v fan temperature control circuit. It works on the principle of thermistor.

Schematic of dc fan controlled by temperature circuit.