WORKING:
The above is the pin diagram of LM2941CT.As you can see it consists of 5 pins and each have its assigned specific functions.We are not using the pin 2 in this circuit since we dont need a separate On/Off operation here.The adjusting pin forms the main part of this circuit as it was connected to the potentiometers R1 and R2.These two potentiometers determines the current flowing through the network.Thus by varying the current flowing through the POT R2 the speed of the motor can be controlled.The POT R1 can be used to control the minimum speed of fan.This circuit is very effective and can control any DC motor of 12v.The working and construction of this circuit is very simple but still effective.
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