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Cooling Fan Circuits
 

Last Updated: December 31, 2017 06:47 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

3-Pin Fan in 4-Pin Socket -  The most recent PC motherboards provide four pin connectors for cooling fans especially for the CPU fan.  The older three pin fans are controlled by varying their DC voltage.  must register on this site __ Designed by Published in Elecktor July/Aug, 2010

AC line powers microcontroller-based fan-speed regulator -  9-Nov-06 EDN-Design Ideas A microcontroller requires dc operating power in the 2 to 5.5V range, an amount that a battery or a secondary power source can easily supply.  However, in certain situations, a microcontroller-based product must operate directly from a 120 or 220V-ac power outlet without a step-down transformer or a heat-producing, voltage-decreasing resistor. __ Circuit Design by Abel Raynus, Armatron International Inc, Malden, MA

An Intelligent 12V Fan Controller -  Does your computer make more noise than it should? It's probably mostly fan noise! Slowing the fans down will reduce the noise but if you go too far, you could end up with fricassee of CPU!__ SiliconChip

Audio Amp makes efficient fan controller -  11/09/00 EDN-Design Ideas You can use discrete transistors to vary power to a fan to control its speed.  However, with a simple modification, you can use an audio-amplifier IC to control a fan module   (Figure 1) .  The LM4872.   PDF contains multiple circuits, scroll to find the one of interest __ Circuit Design by Wallace Ly, National Semiconductor Corp, Santa Clara, CA

Automatic Temperature Controlled Fan -  Here is a circuit through which the speed of a fan can be linearly controlled automatically, depending on the room temperature.  The circuit is highly efficient as it uses thyristors for...__ Electronics Projects for You

Boost converter controls 12V fan from 5V supply -  12/12/97 EDN-Design Ideas Temperature-controlled PWM boost converter allows operation of a12V brushless dc fan from a5V supply.    __ Circuit Design by John McNeill, Worcester Polytechnic Institute, Worcester, MA

Car Fan Speed Controller -  Using this circuit you can control the speed of 12V DC fans used in cars.  The circuit is built around timer 555, which is wired as an astable multivibrator.  The output...__ Electronics Projects for You

Ceiling Fan Timer -  It runs the fan in your bathroom or toilet for a fixed time after you turn it on and has two modes of operation__ SiliconChip

Circuit Generates Analog Fan Speed Control -  Maxim-IC Appnote #1125 This circuit delivers a continuous and linear fan-control voltage that is proportional to temperature.  __ Maxim Integrated

Circuit protects system from overheating -  11/08/01 EDN-Design Ideas The two-chip circuit in Figure 1 provIdeas fan control and overtemperature warning and shutdown signals to protect systems from excessive heat.  The circuit monitors the temperature of the pc board and the die temperature of a CPU, an FPGA, or another IC with an on-chip temperature-sensing transistor __ Circuit Design by Kerry Lacanette, Maxim Integrated Products, Sunnyvale, CA

Circuit provides efficient fan-speed control -  4-Mar-04 EDN-Design Ideas As Moore's Law plunges us into the realm of multigigahertz processors and PCs with gigabytes of RAM, engineers face the task of removing the heat that these state-of-the-art components produce.  Cooling such systems poses a dilemma.  If you optimize the fan size and speed for nominal operating conditions, the system is susceptible to failure when conditions deteriorate __ Circuit Design by John Guy, Maxim Integrated Products, Sunnyvale, CA

Cooling Fan Controller -  As we begin to enjoy those lazy hazy days of summer, the most important thing on most of our minds is how to keep cool during those hot days.  For some of us that means turning up the old air conditioner and sipping on a nice cold glass of our favorite soft drink.  However, we often forget about an equally important __ Designed by Radio Amateur Society of Norwich

Dual Fan Controller -  A birthday present gone too far.  An overengineered temperature-based automatic twin fan controller with brass face to keep a kitchen PC cool.    __ Contact: David Cook

Eddie's Composting Loo fan controller -  In my Dalek loo page I wrote about a range of options to improve the cost effectiveness of a solar powered extraction fan for composting toilets.  At the deluxe end of the range was one incorporating a range of sensors including temperature and humidity.   __ Designed by Eddie Matejowsky

Fan controller made efficient with an Audio Amp -  11/09/00 EDN-Design Ideas You can use discrete transistors to vary power to a fan to control its speed.  However, with a simple modification, you can use an audio-amplifier IC to control a fan module   (Figure 1) .  The LM4872.   PDF contains multiple circuits, scroll to find the one of interest __ Circuit Design by Wallace Ly, National Semiconductor Corp, Santa Clara, CA

Fan On/Off Control By Light -  This circuit lets you turn on/off a fan by just directing torchlight or other light toward its light-dependent resistor  (LDR) .  The circuit is powered from a 5V power supply.  Preset VR1 and...__ Electronics Projects for You

Fan Remote Control -  November 09, 2011Design News:  The gadget comes with off/on, three fan speeds, and multicolored LEDs to indicate the fans speed.  As a bonus, it beeps to indicate that the fan got your message.   __ Designed by Andrew R. Morris, Gadget Freak-Case #198, Design News

Fan Speed Controller -  Simple circuit for fan speed control based on thermal feedback.  To reduce product noise.  Design Idea   was rejected! Years later companies are making millions from such circuits.   __ Designed by Jim Haggerman, Hagerman Technology LLC

Fan Timer Based On Motorola 68HC908QT2 -  My son got his fan in the bedroom.  The fan has mechanical timer for 0-180mins.  One day it broken.  So I got the idea to use Nitron chip to replace the mechanical timer.  Someone may ask me why so complicated timer made by microcontroller chip? Actually we can build a timer with 555 and a 14-stage CMOS counter! The 555 runs astable with time constant controlled by RC and for long period timing we can divide the output frequency of 555 by a CMOS counter.   __ Designed by Wichit Sirichote

IR Digital Thermostat for FAN -  This circuit measures temperature in Celsius scale and displays it on an alphanumeric LCD screen When temperature rise to 40 C an alarm is activated and at the same time a relay is also activated which drives a fan to keep the temperature at a level __ Contact: IQ Technologies

LTC1840: I2c Fan Control Ensures Continuous System Cooling -  DN270 Design Notes__ Linear Technology/Analog Devices

MOSFET switch provides efficient AC/DC conversion -  02/17/00 EDN-Design Ideas Occasionally, you have access to a transformer for powering a dc circuit, but its output voltage is much higher than that required for the dc voltage.  The full-wave-rectified and filtered output of an ac input voltage V X , is V DC =1.414V X-2V F , where V F is the forward drop in the rectifier  (approximately 0.7V) .    __ Circuit Design by Spehro Pephany, Trexon Inc, Toronto, ON, Canada

No-Hum Fan Controller -  Control is derived from the output of regular wall switch.  The signal is filtered to obtain the dimming level as a low level analog voltage by C3 and its associated components.  The LM3914 chip selects one of its outputs depending on the amplitude of the voltage, which turns on one of the LEDs to indicate the speed, and turns on one of the Solid State Relays to control the fan speed.  The LEDs allow a handy display of the speed.  The top LED  (green) shows full power to the fan __ Designed by Ed Cheung

Protect system from overheating -  11/08/01  EDN-Design Ideas The two-chip circuit in Figure 1 provIdeas fan control and overtemperature warning and shutdown signals to protect systems from excessive heat.  The circuit monitors the temperature of the pc board and the die temperature of a CPU, an __ Circuit Design by Kerry Lacanette, Maxim Integrated Products, Sunnyvale, CA

Provide efficient fan-speed control -  03/04/04  EDN-Design Ideas As Moore's Law plunges us into the realm of multigigahertz processors and PCs with gigabytes of RAM, engineers face the task of removing the heat that these state-of-the-art components produce.  Cooling such systems poses a dilemma.   __ Circuit Design by John Guy, Maxim Integrated Products, Sunnyvale, CA

PWM fan controller in an EMI-susceptible -  02/16/06  EDN-Design Ideas Control it with either an external negative-temperature-coefficient thermistor or a PIC microcontroller and its SMBus serial-data bus __ Circuit Design by Dimitri Danyuk, Niles Audio Corp

Remote Fan Control -  November 09, 2011Design News:  The gadget comes with off/on, three fan speeds, and multicolored LEDs to indicate the fans speed.  As a bonus, it beeps to indicate that the fan got your message.   __ Designed by Andrew R. Morris, Gadget Freak-Case #198, Design News

Simple Circuit temperature regulated FAN speed Controller -  This regulator uses a P-FET to change the positive supply voltage to a FAN an NTC resistor mounted on the device that needs cooling will change the fan speed, the temperature on the heat sink will therefore be constant, while the FAN speed will change, depending on power disipated The RPM output signal from most FAN types will continue to function, 

Single Control Switch for Fan & A - C -  Here is an electronic switch that can be used to switch on both the air-conditioner as well as fan of your room, one by one.  The circuit consists of power supply and...__ Electronics Projects for You

SOT-23 Smbus Fan Speed Controller Extends Battery Life & Reduces Noise -  DN238 Design Notes__ Linear Technology/Analog Devices

System Monitors multiple temperatures, controls fan speed -  10/12/00 EDN-Design Ideas The block diagram in Figure 1 represents a complete remote-temperature-sensing and fan-control system.  The system uses an Analog Devices temperature-monitor and fan-control ASIC and a PIC16C84 C from Microchip Technology.  The ADM1022 allows you to measure the local temperature and two remote temperatures within a system.  An on-chip, 8-bit DAC controls the speed of a cooling fan in response to the measured temperature.    __ Circuit Design by David Hanrahan, Analog Devices Inc, Limerick, Ireland

Temperature Based Fan Speed Control & Monitoring using Arduino -  This project is a standalone automatic fan speed controller that controls the speed of an electric fan according to the requirement.  Use of embedded technology makes this closed-loop feedback-control system efficient...__ Electronics Projects for You

Temperature Monitor & fan controller reduce fan noise -  01-May-01 EDN-Design Ideas The scheme in Figure 1 reduces system acoustic noise by running system fans at their optimum speeds for a given temperature.  IC1  combines 1C-accurate temperature measurement of three temperatures with automatic fan-speed control of two channels.  A two-wire serial interface allows you to oversee critical temperature and fan-speed data __ Circuit Design by David Hanrahan, Analog Devices Inc, Limerick, Ireland

Temperature-controlled 12V DC Fan -  Suitable for computer cooling fans.  LED motor speed indicator.   __ Contact: Flavio Dellepiane, fladello @ tin.it

Temperature-controlled Fan -  Gradually increases speed as temperature increases; Widely adjustable temperature range __ Contact: Flavio Dellepiane, fladello @ tin.it

Temperature-Measurement Scheme Uses IR Sensor & Sigma-Delta ADC -  3-Apr-03 EDN-Design Ideas Many noncontact temperature-measurement systems use infrared sensors, such as thermopiles, which can detect small amounts of heat radiation.  Biomedical thermometers that measure the temperature of an ear or a temple use noncontact temperature measurement, as do automotive-HVAC systems that adjust temperature zones based on the body temperature of passengers __ Circuit Design by Albert O'Grady and Mary McCarthy, Analog Devices, Limerick, Ireland

Thermal Cooling Fan Controller -  As we begin to enjoy those lazy hazy days of summer, the most important thing on most of our minds is how to keep cool during those hot days.  For some of us that means turning up the old air conditioner and sipping on a nice cold glass of our favorite soft drink.  However, we often forget about an equally important __ Designed by Radio Amateur Society of Norwich

Thermofan to Keep Your Amp Cool -  Use a 12V computer fan to cool your amp.    Uses diode temperature sensor f __ Designed by Rod Elliott  ESP

Use a PWM fan controller in an EMI-susceptible -  02/16/06  EDN-Design Ideas Control it with either an external negative-temperature-coefficient thermistor or a PIC microcontroller and its SMBus serial-data bus __ Circuit Design by Dimitri Danyuk, Niles Audio Corp


Cooling Fan Circuits


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