I have recently modified a fan controller circuit to include an LED to tell me when the fan is on. I have also modified the circuit to add extra Lanes to allow more fans connected.
A fan controller adjusts the speed of a fan.
A fan controller is able to adjust the speed of a fan simply by changing the voltage to the fan.
The input voltage is 12.2v.
Each fan's operating voltage ranges from 2.8v to 12v and draws 0.23A.
The input voltage is connected in parallel to a voltage regulator(LM317), this is so that each lane will recieve 12v.
The voltage regulator controls the voltage to the fan.
The voltage regulator is able to vary the voltage by adjusting the value on the 10k Potentiometer.
The voltage regulator allows the current range from 1.25v to 11v.
The LED is connected in the circuit at the voltage divider(at R3 and R2), the resistors divide the voltages at R3(300ohm)=2v and R2(1500ohm)=10.2v.
The LED is only there to tell me when the switch to the fan is on.
The original circuit is taken from:
http://www.rigacci.org/docs/biblio/online/voltreg/fan-regulator/tutorial-full.html
My modified version is:
http://i667.photobucket.com/albums/vv36/mxcud/FAN_CONTROLLER.png
I have run simulations in National Instruments Multisim and everything went smoothly.
I have just one concern, the Amps draw cannot exceed 25A.
I am wondering if I have done anything wrong.
Thankyou
A fan controller adjusts the speed of a fan.
A fan controller is able to adjust the speed of a fan simply by changing the voltage to the fan.
The input voltage is 12.2v.
Each fan's operating voltage ranges from 2.8v to 12v and draws 0.23A.
The input voltage is connected in parallel to a voltage regulator(LM317), this is so that each lane will recieve 12v.
The voltage regulator controls the voltage to the fan.
The voltage regulator is able to vary the voltage by adjusting the value on the 10k Potentiometer.
The voltage regulator allows the current range from 1.25v to 11v.
The LED is connected in the circuit at the voltage divider(at R3 and R2), the resistors divide the voltages at R3(300ohm)=2v and R2(1500ohm)=10.2v.
The LED is only there to tell me when the switch to the fan is on.
The original circuit is taken from:
http://www.rigacci.org/docs/biblio/online/voltreg/fan-regulator/tutorial-full.html
My modified version is:
http://i667.photobucket.com/albums/vv36/mxcud/FAN_CONTROLLER.png
I have run simulations in National Instruments Multisim and everything went smoothly.
I have just one concern, the Amps draw cannot exceed 25A.
I am wondering if I have done anything wrong.
Thankyou
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