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Cooling Fan Circuits
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Last Updated on: Tuesday, August 25, 2015 06:52 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. . .  [Published in Elecktor July/Augu, 2010]


AC line powers microcontroller-based fan-speed regulator -  09-Nov-06 EDN Design Idea   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. As an alternative, a polyester/polypropylene film capacitor rated for ac-line service can serve as a nondissipative reactance (Figure 1). . . .  [by Abel Raynus, Armatron International Inc, Malden, MA]

ADT7463 Configurations -  AN-612 Analog Devices Application Note  . . . 


AN-1260: Autonomous Fan Control for Processor Systems using the LM85 -  Application Note  . . .  [National Semiconductor]


AN-1262: Four-Speed Fan Control using Simple Remote Diode Temperature Sensor -  Application Note  . . .  [National Semiconductor]

AN36 ZXBM200x Series of Variable Speed 2-Phase Fan Motor Controller -  Zetex Semiconductors Applications Note:  This applications document is intended to aid users in ir development of  controller electronics for fan and blower motors using  ZXBM200x series of variable speed, 2-phase, DC brushless motor controllers. . . . 


AN-612: ADT7463 Configurations -  AN-612 Analog Devices Application Note  . . . 


AN-613: Programming the Automatic Fan Speed Control Loop -  AN-613 Analog Devices Application Note  . . . 


AN-699: Noise Filtering & the ADT7461 -  AN-699 Analog Devices Application Note  . . . 


AN-702: Using the ADT7461 as a Multichannel Temperature Sensor -  AN-702 Analog Devices Application Note  . . . 


AN764: Implementing Temperature-Based Variable Fan Speed Control in Nlx Power Supplies -  Application Note Published 4-Feb-03  . . .  [Microchip]


AN767: Interfacing Microchip’s Fan Speed Controllers to a SPI? -  Application Note Published 12-Nov-02  . . .  [Microchip]


AN768: Redundant Fan Systems using the TC647 Fan Manager -  Application Note Published 4-Feb-02  . . .  [Microchip]


AN770: Linear Voltage Fan Speed Control using Microchip's TC64x Family TC642, TC646, TC648 -  Application Note Published 27-Jul-04  . . .  [Microchip]


AN771: Suppressing Acoustic Noise in PWM Fan Speed Control Systems -  Application Note Published 27-Jul-04  . . .  [Microchip]


AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package -  AN-772 Analog Devices Application Note  . . . 


AN772: Speed Error in PWM Fan Control Systems TC646, TC647, TC649 -  Application Note Published 27-Jul-04  . . .  [Microchip]


Audio Amp makes efficient fan controller -  11/09/00 EDN Design Idea   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, sc. . .  [by Wallace Ly, National Semiconductor Corp, Santa Clara, CA]


Automatic Temperature Controlled Fan -  This is a circuit that can linearly control the speed of a fan depending on the temperature of the room. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]


Autonomous Fan Control for Processor Systems using the LM85 -  Application Note  . . .  [National Semiconductor]


Boost converter controls 12V fan from 5V supply -  12/12/97 EDN Design Idea   Temperature-controlled PWM boost converter allows operation of a12V brushless dc fan from a5V supply. . . .  [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 of the multivibrator is fed to IRF 540 MOSFET. The fan is connected between the positive terminal of the battery and drain (D) of MOSFET T1. Capacitor C1 is connected in parallel to the fan to stabilise its speed. Free-wheeling diode D1 protects the motor from back emf. A fuse is included for protection. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]


Ceiling Fanspeed Control -  Ceiling Fan Speed Control - For one of those 3 or 4 blade decorative fans. . . .  [Reverse engineered schematic by Stepan Novotill]


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 Idea   The two-chip circuit in Figure 1 provides 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. . .  [by Kerry Lacanette, Maxim Integrated Products, Sunnyvale, CA]


Circuit provides efficient fan-speed control -  03/04/04  EDN Design Idea   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. . . .  [by John Guy, Maxim Integrated Products, Sunnyvale, CA]


Computer fan speed tacho out circuit -  Add a fan speed monitor lead to any 12V two wire fan. You will find this identical circuit inside most 3 wire computer fans with speed monitoring output to the motherboard. Peel off the sticker from the fan hub in order to access a motor winding pin for connecting up the tacho circuit. . .  [Circuit by Stepan Novotill]


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. . .  [Radio Amateur Society of Norwich]


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Cooling Fan Circuits:  #'s - C      D - S      T - V

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