Simple Dc Fan Speed Control Circuit

The speed of the motor can be controlled by changing the setting of p1.

Simple dc fan speed control circuit. Tested at 12v 1a dc fan. The above parts are the only necessary items needed to create this simple dc fan circuit. As we know that by varying the firing angle of the triac the power applied through the load is controlled which is nothing but a concept of power control using triac. By this method smoothly controlled the speed of dc motor at negligible noise.

Today i am going to show you this circuit. Do you want to control the speed of dc motor. 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 using this circuit you can control the speed of dc fan by tuning the potentiometer volume control variable resistance.

The setting of p1 determines the phase of the trigger pulse that fires the triac. But if you want easy and cheap. You can use household equipment like a drilling machine to control the rotating speed of it. We have many ways to do it.

Then check out this outstanding single chip pwm motor speed controller circuit that will give you a complete 360 degrees of continuously varying motor speed control right from zero to maximum. Now we are going to build a simple fan regulator circuit which is generally used to control the speed of the fan in our homes or offices. This triac based 220v ac motor speed controller circuit is designed for controlling the speed of small household motors like drill machines. Out of the four schmitt triggers inside the 4093.

Are you fed up with ordinary pwm circuits which do not provide perfect dc motor speed control especially at lower speeds. This circuit is designed as per a request made by mr vinoth from india. We can adjust the speed of 12v small motor. Quad 2 input schmitt trigger ic cd4093 is the heart of this circuit.

When the temperature increases the base current of q1 bc 547 increases which in turn decreases the collector voltage of the same transistor. The speed is controlled through an externally applied varying dc voltage source. They use the principle of pwm motor control mode. These are 12 volt dc variable speed motor controller circuit using cmos.

Here is some circuit diagram of dc fan regulator using pwm method. Working of temperature controlled dc fan using thermistor. His requirement was a 12v 5a dc fan motor controller. It works on the principle of thermistor.

This ac motor speed controller circuit is working based on the triac and diac. If you can find a fan which is rated for 9vdc this is even better because then you can use a single 9 volt battery in order to supply adequate power to turn on and operate the fan and do away with the dc power supply if you do not have one. Simple ac motor speed control circuit using bt136 triac.