## Thursday, August 13, 2015

### Circuit Schematic Fan Speed Controller using LM2941

Eltronicschool. - Here is simple circuit schematic of fan speed controller using LM2941 IC. (You also can read: Circuit Schematic Automatic Speed Controller for Fans and Coolers). As we know that there are many electronic circuits related to fan speed controlling have been published here and this one is just another approach.

In here we will show you one circuit schematic fan speed controller using LM2941 like in figure 1 below. Beside that, we also will give you global description about this circuit schematic of Circuit Schematic Fan Speed Controller using LM2941.

Circuit Schematic

 Figure 1. Circuit Schematic Fan Speed Controller using LM2941 (Circuitstoday)

Component Part
1. C1 = 470nF
2. C2 = 470uF
3. IC1 = LM2941
4. R1 = 22K
5. R2 = 10K
6. R3 = 2.2K
7. F1 = Fan
Description

Circuit schematic like in figure 1 above is Circuit Schematic Fan Speed Controller using LM2941. According Circuitstoday site describe that The circuit diagram shown here is of 12V DC fan speed controller using the IC LM2941CT which is a low drop out 1A voltage regulator. The IC has a dropout voltage as low as 0.5 and has also many useful features like power supply reverse protection, thermal protection, short circuit protection etc. The maximum output current the IC can source is 1A.

The 12V DC supply is connected between the Vin (pin4) and ground (pin3) of the IC. The load, which is the fan, is connected across the Vout (pin5) and ground (pin3) of the IC. The network comprising of potentiometers R1, R2 and resistor determines adjust current (Iadj) of the IC. By varying the Iadj using the POT R2 we can adjust the output voltage of the IC and hence the fan speed.

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