The first two pins are always used to deliver power to the fan motor, while the rest can be optional, depending on fan design and type: The color of the wires connected to these pins varies depending on the number of connectors, but the role of each pin is standardized and guaranteed to be the same on any system. The port that the fan connects onto the motherboard is known as the fan header. This is commonly accomplished by the motherboards having hardware monitoring circuitry, which can be configured by the end-user through BIOS or other software to perform fan control. There are usually many small holes on the back panel that the switch can be mounted in. Since the voltage drop is proportional to the current, the fan may not start. Any desktop PC with standard case fan mounts will work (80mm, 120mm, 140mm, 200mm—it doesn’t mater as long as they’re consistent). They only cost a little more than regular PC fans. Dec 12, 2012 #1 I currently have three stock 120mm case fans, one as an air intake, one as an exhaust, and one on the side (that I am considering leaving off). You cannot connect the 5V signal cable to the 12V header. In this style of fan control, the fan is either on or off. Logic Supply CL100 Fanless Braswell NUC PC, AMD A10-7860K & Athlon 880K: Kaveri Refresh, 7263 Winchester Ave. West Bloomfield, MI 48322. Modern hardware monitor chips, once configured, are capable of independently running this monitoring loop without any need for a functioning BIOS or an operating system. ARCTIC F8-80 mm Standard Case Fan, Very Quite Motor, Computer, Push- or Pull Configuration, Fan Speed: 2000 RPM - Black/White. This control method reduces noise issues and power requirements during periods of low usage, but when the system is operating at capacity, the fan noise can become a problem again. Two such programs are SpeedFan[24] and Argus Monitor. As soon as you begin trying to quiet your PC, you realize how useful it is to be able to provide lower than 12 volts DC (VDC) to fans in the system. Laufrichtung Umkehren is in dem Sinn Sinnvoll, dass man den Lüfter nichmehr abbauen muss wenn man ihn mals saugend statt blasend machen möchte, Aber funktionieren tut es trotzdem nicht, habs getestet lüfter an 9 Vold batterie und nur nur mit einer Kabel Kombination gehts, also kabel einfach Polung tausche geht nicht. We're dedicated to providing top-notch advice and reviews for choosing your next PC build. By varying the voltage input across the acceptable range for a fan, the speed of the fan will increase (to added voltage) and decrease (to reduced voltage); a faster fan means more air moved and thus a higher heat exchange rate. The easiest way to determine what fan you need to replace your existing chassis fan is to remove it and check the markings on it. Our technical advice has been featured on publications such as: New York Times, O'Reilly, PCMag, Popular Mechanics, Forbes, etc. Another method, popular with gamers[which? The sensors of ATI … Eine einfache Lüfter-Regelung besteht aus zwei Kabeln. For higher currents, discrete linear regulators are relatively simple to construct using a power transistor or MOSFET and a small signal transistor or a Zener diode as a voltage reference. Deciding on a cooling approach that matches your case and your components before you go shopping for fans and coolers can be helpful. The common cooling fans used in computers use standardized connectors with two to four pins. plus countless trade shows and industry articles. The Open Hardware Monitor is a free open source software that monitors temperature sensors, fan speeds, voltages, load and clock speeds of a computer. Heat production varies with system load, where periods of compute-intensive activity generate much more heat than the idle time does.[1]. Some fans, such as the tower cooling fans, operate at 12 volts while Central Processing Unit (CPU) fans may operate at seven volts. However, this is a potentially risky method, because +5 V PSU line is intended to source current only, not sink it, so the PSU is likely to get damaged in case of load on 5 V PSU line being below the load generated by 7 V fans (e.g. This will fry your components. Electronic. Another method of reducing the fan speed[5] is by moving the 5 V wire in the classical Molex power connector in the place of the Ground wire going to the fan, thereby delivering +7 V (12 V − 5 V = 7 V) to the fan. Unlike linear voltage regulation, where the fan voltage is proportional to the speed, the fan is driven with a constant supply voltage; the speed control is performed by the fan based on the control signal. As with other linear regulators, the waste heat that is produced will be roughly P = (Vin - Vout) Iout.[8]. Alibaba.com offers 472 pc fan voltage products. Fan control is the management of the rotational speed of an electric fan. when PC enters idle/sleep state). The method by which the software physically controls the fan is usually PWM (see above). By connecting one or both wires to a different voltage, the voltage the fan receives will be different from the default 12 V the fan was designed for. This simple project describes how to rig up a switch that will let you feed 5 VDC to your fan(s) for low noise operation, and 12 VDC when more cooling is needed for hot weather or a bout of serious overclocking. Ist dies nicht der Fall, empfehlen wir Ihnen, den Lüfter schnellstmöglich auszutauschen um weitere Schäden am Computer zu vermeiden. Damit sorgen sie für ein Nachströmen kühlerer Umgebungsluft und somit für die notwendige Kühlung der Elektronikkomponenten. Here’s a photo of my setup, inside and out. 12V headers operate via analogue signal and 5V headers are digital signals. Running 7V CAN sometimes be potentially stressful for the PSU for technical reasons I won’t go into here. To obtain 5V, the red fan wire goes to pin #4 (red), and the black fan wire goes to pin #2 or 3 (black). Zur Drehzahländerung kann man wahlweise die Versorgungsspannung A DPDT switch has three positions (2 polarities), and can switch two independent circuits at one time. Enjoy. 4-pin PWM (pulse width modulation) can be dynamically controlled by software and hardware very easily. That's what is happening when I plug it in the motherboard. Also note that sometimes the ground ( – ) wire from the fan is not black, but blue. The CPU fan is usually supplied with a 3V or 5V from the PSU (power supply unit) on laptops and 12V on desktops. For example: Your fan uses 100mA at 7V. Habe jetzt hinten ein Loch reingesägt, einen 120mm Lüfter daran geschraubt und den Lüfter an den PC angeschlossen. Previous Next J. joeflint82 Honorable. A standard cooling fan is a DC motor with blades attached. There a lots of devices in typical computers, which draw much more power out. Undervolting PC Fan from 12V to 7V. Save my name, email, and website in this browser for the next time I comment. Ask Question Asked 4 years, 4 months ago. Since fan noise increases with the fifth power of the fan rotation speed,[2] reducing revolutions per minute (RPM) by a small amount potentially means a large reduction in fan noise. Cooling fans equipped with either two- or three-pin connectors are usually designed to accept a wide range of input voltages, which directly affects the rotation speed of the blades. Also, if you couldn’t locate any fan settings in your BIOS, to begin with, this means that your motherboard probably doesn’t support this option. You probably know by now that the standard IDE power connector from the power supply contains 2 voltage lines and a third which is derived from their difference: 12V, 5V and 7V. If you have to drill, take care not to let the metal shavings get into your components. If the PC fan really does have has a brushed motor, then you can just control it with PWM. The easiest way to adjust CPU fan speed is through the BIOS. 120mm Case fans, Voltage question. Peltiers or things with power consumptions running up to dozens of watts, require careful calculation of what goes out of the 5V lead and what’s going in there from the 12V lead. To obtain 12V, the red fan wire goes to pin #1 (yellow), and the black fan wire goes to pin #2 or #3 (black). The voltage drop across the diode will fall with temperature, causing the fan to speed up. To obtain 7V, the red fan wire goes to pin #1 (yellow), and the black fan wire goes to pin #4 (red). Computer fans vary in size and voltage requirements. A 3D illustration of six 80 mm fans, a type of fan commonly used in personal computers (sometimes as a set, or mixed with other fan sizes) A 30-millimetre (1.2 in) PC fan laying atop one sized 250 mm (9.8 in) A computer fan is any fan inside, or attached to, a computer case used for active cooling. 100mA are sucked out of the 5V lead, 100mA come from the 12V lead and 200mA go to ground. The CPU temperature can be monitored by reading the core temperature sensors of Intel and AMD processors. Like other series regulators, the diode will dissipate power equal to its voltage drop times the current passing through it. Your email address will not be published. Thread starter joeflint82; Start date Dec 12, 2012; Tags Video Games; Sidebar Sidebar. PC-Lüfter: Die PC-Lüfter (öfters auch als Computer-Ventilatoren bezeichnet) transportieren durch ihren erzeugten Absaugluftstrom die Wärme aus dem Rechner. Common voltage regulator ICs like the popular LM78xx series are sometimes used to provide variable or constant voltage to fans. Get it as soon as Tue, Feb 23. © 2021 SilentPCReview All Right Reserved. Processors produce varying levels of heat depending on system load, thus it makes sense to reduce the speed of the fans during idle to decrease the noise produced by fans running full speed, until the load does goes up, at which point fan speed must be adjusted promptly to avoid overheating. The Open Hardware Monitor supports most hardware monitoring chips found on todays mainboards. Through this procedure, 10, 17 and 24 V voltages can be achieved, with voltages exceeding 12 V being potentially damaging to the computer fans rated at 12 V. However, the combination of modern power supplies no longer being required to provide a −5 V power line and the limited power delivery capability of the −12 V line (usually less than 1 A of current) reduces the total capacity for volt modded fans in modern systems. The red and black lines represent the wires from the fan. 17 posts knopix. AW: Drehrichtung von Lüfter umkehren möglich? However I don't like that, because the fan is making a lot of noise. When the temperature drops below a threshold again, the fans are turned back off. A silicon diode provides a relatively constant voltage drop of about 0.7 V per diode; data sheets for a specific diode specify its voltage drop, for example the 1N4001 silicon diode's voltage drop varies from approximately 0.7 to 0.9 V as the current varies from 0.01 to 1 A. Resistors in series with a fan's power pin are the simplest method of reducing fan noise, but they add to the heat generated inside the computer case. Which means, that you need to have other loads on that 5V lead, which suck out more current than you feed to that lead from the 12V lead. Most modern motherboards feature hardware monitoring chips, which are capable of performing fan control,[1] usually through the PWM method as described above. This must be done cautiously, as excessive reduction in speed may cause components to overheat and be damaged. That said, cooling fans come with a surprising amount of variation. Top 10 Best Pc Fan Voltage Reviews Of 2021. In which case you should move on to the next method. The byproduct of increased heat generation is that the fan(s) need to move increasing amounts of air and thus need to be more powerful. 15,69 € 15,69 € "pc lüfter 12v 2pin" Neuftech 120 mm PC Gehäuselüfter Netzteil Lüfter leise Kühler 2 pin DC 12V - rot. They need to be of the appropriate power rating. Interest has been growing in integrated circuits for controlling the speed of cooling Using switches or knobs, attached fans can have their speeds adjusted by one of the above methods. Most PCs don’t provide any way to control the speed of the fans. This control method reduces noise issues and power requirements during periods of low usage, but when the system is operating at capacity, the fan noise can become a problem again. This automatic control offered by some chips may be called Thermal Cruise mode for maintaining a thermal envelope, as well as Fan Speed Cruise mode for maintaining a specific fan speed automatically.[10]:§12. Few PC components are so critical to the performance of your computer, yet so inexpensive than your PC fans. Increasing the voltage[4] over the default 12 V can be achieved by e.g. connecting the −12 V or −5 V power line instead of the ground wire in the fan connector, and by connecting the 5 V power line in the +12 V input of the fan connector. With this type, fan speed is typically controlled by increasing or decreasing the voltage over the power wire. For variable fan control, potentiometers could be used along with a transistor such as a MOSFET whose output voltage is controlled by the potentiometer. The image on the left is a typical switch; the image on the right is the wiring diagram for this 12V / 5V switch. The images below explain more clearly. Temperature inside the chassis is checked, and if an outside-of-range temperature is detected, fans are set to their maximum speed. Unless you can find some sort of PCI/PCIE expansion card to provide a 5V header, it sounds like you will not be able to connect this product to your motherboard. Computers emit this electrical power as heat generated by all major components. There are a few ways to perform this regulation, as described below. There may be accessories you can buy, but sometimes, things like fan bays are overkill. The safest method of volt modding is connecting the +5 V power line to the +12 V input of the fan, which reduces the voltage the fan receives to +5 V. Some fans will not work at such low voltage at all, while some other fans may run at +5 V once they have started rotating at a reasonable speed. However, not all software is capable of accessing these advanced configuration parameters provided by some chips, and it is very common that the generic software implements only the most basic interfacing with the chips, namely, an explicit setting for the duty cycle for each fan control setting, subsequently performing the duty cycle adjustments itself in software, and thus requiring that both the operating system, as well as this third-party software itself to continue running on the main CPU to perform the monitoring loop. Processors in most early x86-based computers, up to some of the early 486s, did not need active ventilation. The control signal is a square wave operating at 25 kHz, with the duty cycle determining the fan speed. 3-pin DC connectors also run at full power, but your motherboard can limit the voltage going to them, thereby altering the speed. Habe mir einen neuen Schreibtisch samt PC Schrank gekauft. What are the voltages on a 3-pin fan connector? The voltage a computer cooling fan receives is defined by the difference between the voltage wire (+12 V) and the ground wire (+0 V). I am trying to measure the current of a DC computer cooling fan (Intel E18764-001) at various voltages. [3] The power rating should be noted and some diodes may require cooling to operate at their rated current. Eventuell sind die Kabel defekt oder haben sich gelöst. Möchtet ihr die Lüfter runter- oder hochregeln, geht das am schnellsten mit der kostenlosen Software SpeedFan. Prüfen Sie zunächst, ob Ihr Lüfter ordnungsgemäß arbeitet. [10]:§11.3 This may not be a problem until the system or the utility crashes, at which point the system may overheat due to the failure of the fans to maintain adequate cooling whilst running at reduced voltage and speed. Sometimes all you want is to be able to switch between high and low speed. About 0% of these are Fans & Cooling. CPU-Lüfter steuern und Lautstärke anpassen mit SpeedFan. So habe habe ich meinen CPU-Lüfter gekauft, der Verkäufer und 2 weitere Kunden waren dabei und nach drei hörtest habe ich den für, mich am leisten CPU-Lüften entschieden. Dank dieem Adapter läuft der Lüfter wunderbar auf voller Leistung. If you plug something between the 12V and 5V lead, you have to be absolutely sure, that no current is fed back into the PSU. A three pin connector is basically power (5/12 volt), ground, and signal. As soon as you begin trying to quiet your PC, you realize how useful it is to be able to provide lower than 12 volts DC (VDC) to fans in the system. Überprüfen Sie ebenfalls sämtliche Verkabelungen des Lüfters. There are also third-party programs that work on a variety of motherboards and allow wide customization of fan behavior depending on temperature readings from the motherboard, CPU, and GPU sensors, as well as allowing manual control. Since they must move more air through the same area of space, fans will become more noisy. [1], As modern PCs grow more powerful so do their requirements for electrical power. 4.6 out of 5 stars 6,981. That’s it. I had … It took me less than 15 minutes to build. Check it out here. When the temperature drops below a threshold again, the fans are turned back off. Sometimes all you want is to be able to switch between high and low speed. Hardware. leider ist das Problem, dass der Schrank komplett geschlossen ist. The fans will not be able to directly connect either. Posted: Thu Apr 28, 2005 12:21 am I have a fan … Wise, Aged Ars Veteran Registered: Jun 23, 2003. 4,3 von 5 Sternen 451. These chips can be configured through BIOS,[10]:§11.1 or by using specialised software once the operating system has booted. Required fields are marked *. In computers, various types of computer fans are used to provide adequate cooling, and different fan control mechanisms balance their cooling capacities and noise they generate. Typically a fan can be driven between about 30% and 100% of the rated fan speed, using a signal with up to 100% duty cycle. 4,4 von 5 Sternen 2.898. You will also need a soldering iron or gun and wire strippers or cutters. There may be accessories you can buy, but sometimes, things like fan bays are overkill. The exact speed behavior (linear, off until a threshold value, or a minimum speed until a threshold) at low control levels is manufacturer dependent.[9]. Fans installed in a PC case can produce noise levels of up to 70 dB. ; updated Dec 14, 2003 (to include 7V information). One to supply the voltage (red), another is neutral (black) and the other is used to control the fan speed (yellow). [25], Learn how and when to remove these template messages, Learn how and when to remove this template message, http://www.diodes.com/datasheets/ds28002.pdf, "LM317 - Single Channel LDO - Linear Regulator (LDO) - Description & parametrics", "Thermal Considerations for Linear Regulators", "4-Wire PWM Controlled Fans Specification", "Review: SilentTEK - AOpen's mobo-embedded fan controller", "Intel® Desktop Boards - Intel® Active Monitor", "Quiet computing with BSD: Fan control with sysctl hw.sensors and lm(4) on OpenBSD and DragonFly BSD", "SpeedFan - Access temperature sensor in your computer", "Argus Monitor - Software to control CPU, GPU and System fans using any available PC temperature source", 4-Wire PWM Controlled Fans Specification v1.3, Why and How to Control (2/3/4-wire) Fan Speed for Cooling Electronic Equipment, Controlling fanspeeds in Linux on PWM motherboards, Thinkpads and ASUS Eee PC, https://en.wikipedia.org/w/index.php?title=Computer_fan_control&oldid=995673136, Articles needing additional references from April 2014, All articles needing additional references, Wikipedia introduction cleanup from December 2014, Articles covered by WikiProject Wikify from December 2014, All articles covered by WikiProject Wikify, Articles with multiple maintenance issues, Wikipedia articles in need of updating from December 2020, All Wikipedia articles in need of updating, All articles with specifically marked weasel-worded phrases, Articles with specifically marked weasel-worded phrases from December 2020, Creative Commons Attribution-ShareAlike License, Vcc (Power) – nominally a +12 V supply, though it may be variable depending on fan type and desired fan rotation speed, Sense (or tachometer) output from fan – outputs a signal that pulses twice for each revolution of the fan as a pulse train, with the signal frequency proportional to the fan speed, This page was last edited on 22 December 2020, at 07:22. Dabei gingen die Meinungen über nerfende Töne sehr aus einander. Computer fans can also be used for a number of hobby projects that are not computer related. The sense pin is used to relay the rotation speed of the fan and the control pin is an open-drain or open-collector output, which requires a pull-up to 5 V or 3.3 V in the fan. While discrete regulators require additional components (a minimum of two transistors, three resistors and a small capacitor), they allow for arbitrarily high currents, allowing for the regulation of additional fans and accessories. Not all fans or motherboards control or power the fan assemblies the same way. Many companies now provide software to control fan speeds on their motherboards under Microsoft Windows or Mac OS X/MacOS. Forums. Most PCs don’t provide any way to control the speed of the fans. A diode in series with the fan will reduce the voltage being output to the fan. The picture below shows how the various voltages can be obtained: Note that the pins on the IDE power connector are not colored; the wires that lead to them are.
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