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How To Make a Fan Speed Controller for Heatsink

Last Updated on February 17, 2018 by Admin 1 Comment

In this publish we go through concerning a automatic fan speed regulator circuit for handling the temperature of a heatsink and from avoiding the temperature to erach risky phases. This process is always to make certain safeguardign of the hooked up devices wit the heatsink.

By making use of this circuit the speed of a fan motor elf adjusts dependent on the temperature of a heatsink which may be supposed to be regulated. Listed here a normal thermistor device is employed as the temperature sensor selected with a resistance value of 10 K at 25 degrees ambient temperature.

The motor to be regulated is supported by the PWM pulses from the IC 555 whose pulse rate cycle falls from around 34% at room temperature (minimum speed) to 100% (maximum speed) when the temperature has achieved a high. These kinds of pulses are created by 555 that may be rigged to work as an integrated voltage regulated oscillator circuit. On the control voltage pin 5 a ranging voltage is utilized dependent upon the durability of the thermistor which usually varies according to the temperature created over the heat sink.

That allows you to make certain a quick transfer of temperature, the thermistor needs to be linked or stuck to the heatsink correctly. The shown 100uF capacitor attached in equal with the thermistor shorts the supply with pin5 of the IC simulating a higher temperature status for some seconds in the course of power activate in order that the motor gets an initialization torque and is stopped from acquiring stalled.

The voltage to the IC 555 is managed by the zener diode of 9,1V in order that it enables the IC to perform irrespective of the input supply variations.

To adjust the temperature activating threshold exactly where the motor could be supposed to increase, you can actually change the value 2.7K resistor hooked up to pin 5 of 555 or perhaps apply a potentiometer for creating the exact same.

 

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About Admin

Hey friends, Thanks a bunch for stopping by this site! I am an engineer with a Bachelor of Engineering in Electronics and Telecommunication. One of my passions is gathering information from all sorts of electronics books and tutorials. I then take that information and compile it into a language that is super easy to understand. My goal is to make those complex electronics circuit concepts and technical terms much more accessible for all the new and budding electronics engineers out there. I can also design customized circuit diagrams as required by the users.
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Reader Interactions

Comments

  1. Colin Mitchell says

    September 17, 2022 at 11:22 am

    The 555 just about does not work at 5v and the lowest voltage needs to be more than 6v.

    Reply

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