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# Pwm signal lüfter

Im PWM-Signal versteckt sich ein Taktzyklus, der den Lüfter in sehr kurzen Abständen an und wieder ausstellt. Dieser Wechsel findet so schnell statt, dass der Nutzer in der Regel davon nichts. According to the controller configuration, the PWM is limited to the 0-50% range, meaning the "average" voltage fed to a given fan never exceeds 12V (in reality, 1ms 24V pulses followed by 1ms power off, possibly smoothed by the capacitor).

The BioniX F120 is a 120mm Case Fan with an extremly silent 3-phase motor. With the PWM PST Technology is is controllable in a wide range of 200 to 1.800 RP An integrated circuit varies the speed and airflow of a fan using a pulse-width-modulated (PWM) voltage in response to temperature or system commands send typically by a computer motherboard. You can use them to run at full speed from an external supply if you adapt the plug My reason for thinking PNP is different to yours and I’d like to understand why not having it grounded to 0V would cause more EMI, given that it would still be attached to 12V on one end, which I see as “grounded” to a higher potential if you get what I mean. I am also doing DAC and ADC in this circuit and having a clean ground is more important than having a clean 12V...so einfach ist es dann doch nicht: Ich würde gerne dieses Kabel verwenden um meine drei CPU Lüfter anzusteuern. Hab das Kabel durchgemessen: an den Enden liegen die 12V an, am Stecker fürs MoBo fließt kein Strom zurück, die Phase für die PWM Steuerung am MoBo Stecker kommt an allen Enden an. Den Steuerwert der PWM Phase selbst kann ich mit einem Multimeter nicht messen I agree that adding a resistor from the base of the PNP transistor to Vcc would ensure that the transistor is truly “off” when the NPN is not driven, although I think you might find that the “leakage” current through the NPN (when off) is tiny and is not enough to switch the PNP transistor on (in this case).

I would drive the fan directly, without the transistor, to verify it runs full speed. If so, then you could try reducing the base resistor down to something between 100 and 470 ohms. As for the cap cleaning up the RPM reading, without a scope to see what the RPM signal looks like, it is hard to say what is going on. Do make sure the internal pull-up resistor is enabled, as shown in the code. ARCTIC F14 PWM - 140 mm PWM Case Fan, Silent Cooler with Standard Case, PWM-Signal regulates Fan Speed, Push- or Pull Configuration possible, Fan Speed: 200-1350 RPM 4.3 out of 5 stars 1,666 £6.4 Skinnerz has the correct answer; 2 wire fans are just power connections 3 wire fans have an extra OUTPUT from the fan to tell the (generally motherboard) what speed the fan is turning. 4 wire fans have that same output as 3-wire fans, but also a PWM input pin that you can drive with a regular old pwm output pin from an arduino (or motherboard) Converter for 4-Pin PWM connector to 2 or 3-Pin fan, Version 2 Some times you have a 4-pin regulated fan output that does not allow voltage control, but what you want to use is a 2-pin or 3-pin fan that is controlled by its operating voltage. For me, this happened when I wanted to replace the fan on my graphics card due to noise

### Prozessor- und Gehäuse-Lüfter-Anschluss: 3-Pin, 4-Pin und PWM - Funktionen und Farben der Kabel

Ich habe gezielt nach leisen Lüftern gesucht und da ist bequiet natürlich gesetzt. Zusätzlcih wollte ich auch noch eine PWM, was diese Lüfter auch versprechen. Leider hatten die Lüfter (ich hatte zwei bestellt), nur nach der Verpackung PWM. Die in den Verpackungen enthalten Lüfter haben nur einen 3-pin Anschluss Vor allem bei aktuellen PCs sind CPU- und Gehäuselüfter obligatorisch. Während ein Gehäuselüfter, wie der Name es bereits andeutet, direkt im Gehäuse befestigt wird und Luft in das oder aus dem Gehäuse befördert, ist der CPU-Lüfter auf einem mehr oder weniger großen Kühlkörper befestigt, der direkten Kontakt zur CPU hat.(At first I noticed that I reversed biased the PNP, corrected it and put a new one, and it´s the same) GELID Solutions hat mit dem Silent 12 PWm einen guten Lüfter, der vor allen dingen mit einem sehr guten Preis von gerade einmal 7,00€ ( stand 02.2009 ) überzeugen kann. Aber auch die Laufruhe und der Lieferumfang sprechen für sich. Bei niedriger Drehzahl ist der Silent 12 PWM nicht zu hören, bietet aber einen guten Luftdurchsatz 2.4 PWM Control Input Signal The following requirements are measured at the PWM (control) pin of the fan cable connector: PWM Frequency: Target frequency 25 kHz, acceptable operational range 21 kHz to 28 kHz Maximum voltage for logic low: VIL = 0.8 V Absolute maximum current sourced: Imax = 5 mA (short circuit current

Pure Wings 2 120mm PWM high-Speed, BL081, Cooling Fan These connectors were designed to be compatible with each other. Pin 1 is ground, 2 is +12, 3 is RPM sense and 4 is the PWM signal. Using a PWM fan (4-pin) on a non-PWM header (3-pin) just means that fan will always run at 100% just like a non-PWM fan (unless fan speed is controlled by. This post helped me a whole lot. I even went down the data sheet rabbit hole from the load switch link in the other article. Thanks a bunch! I need high side switches controlled by a 7 segment driver to drive 12v high powered LEDs in a display. This should do the trick!

### Arduino Tutorial #4 - PWM und analoge Signale - (deutsch

1. Hi there, awesome explanation this is just what I need for my project. However I cannot make the fan change speed, it just sits there at around 50% speed. Uploaded your sketch with the serial monitor control and I did nothing. I used a BC548 and a BC747. 100nF capacitor to signal, 330nF Capacitor in the PNP base to ground, and 2 1K ohm resistors at each base of the transistors. Any idea? Thanks! I follow on youtube, it´s great!
2. ing the fan speed. 25kHz is used to raise the sound of the signal above the range of human hearing; use of a lower frequency could produce an audible hum or whine. Typically a fan can be driven between about 30% and 100% of the rated fan speed, using a signal.
3. Fast PWM on ATTiny85. This is a post about changing the PWM frequency of an ATTiny85 which has been programmed via the Arduino IDE. I wanted a faster PWM frequency to remove audible noise on a dump load controller I had been designing. This controls an output load using PWM and a FET. This produced audible noise when running

## PWM fan controlling - frequency · Issue #841 · xoseperez

I guess without being familiar with the specific circuit theres no way of knowing exactly how it will react. I pulled apart a V2 NZXT fan that looks similar to yours to confirm it is indeed brushless. It was a RF-FN122-RB. Inside I found a similar layout with a 2 pole motor driven by an FTC S211.5PF chip. I confirmed a varying speed response with voltage adjustment and PWM. I dont have any good way to measure torque and didnt quantify speed. R3/C2 is a low-pass filter that smooths (integrates) the incoming PWM signal from the motherboard, so that an analogue input of the microcontroller can be used to read the PWM control signal from the motherboard. For the analogue temperature sensors you can use two 10 kΩ NTC sensors, which are connected to K11 and K12

### Arduino Tutorial #3

1. Thanks to the new engine technology, our new PWM fans can operate in a 0 db mode. If the PWM signal falls below 5 %, the fan stops and thus operates completely silently. If the operating load of the computer rises and more cooling is necessary, the fan is automatically informed via PWM and starts again. How do I configure my PWM settings
2. There are PWM splitters which take the burden of DC power off the motherboard while providing total thermal control. The Swiftech 8W-PWM-SPL units ($10) will control eight PWM fans with the signal from the CPU_FAN header (or any PWM plug that allows for thermal control). But you can only monitor one of the devices attached to it 3. destens einen Stromanschluss, um zu funktionieren. Neben den zwei dafür vorgesehenen Leitungen gibt es bei modernen Lüftern immer auch eine dritte für das Tachosignal (Drehzahl des Lüfters). PWM-Lüfter, die vor allem für die Kühlung der CPU vorgesehen sind, haben noch eine vierte Leitung, die die Regelung der Geschwindigkeit übernimmt. PWM steht dabei für Pulsweitenmodulation (mehr dazu weiter unten im Artikel). ### [Mikrocontroller, Teil 4] PWM Steuerung - YouTub • The PWM pin accepts 5V input, and sources no more than 5mA, so it should be fine. Many fans should work with Arduino´s default PWM. The Norm says you have to use 25 kHz PWM frequency though, which is a bit tricky. See AKA's post in the Control PWM Fan Thread. Yes, Arduino and the 12V power supply for the fan need to have common ground. PWM. • With my PWM signal driving working well and the hall sensor signal cleaned up, it was time to measure RPMs on the Arduino. • Hey everyone! As I off-topicly mentioned in Gummix' thread (Temperature controlled PWM Fan), I'm desperately trying to get a readout of a fan's RPM-Signal. Everything I got from the rpi-GPIO-Node could not be interpreted in any way to make sense - at least not to me. I'm not even sure if the processing of the readout in Node-RED is fast enough to accomplish that, the Rasperry Pi 3 should be. • g an absolute belief in the supplied specifications of the ideal 12V fan from the fan manufacturers, and designing the efficient PWM supply accordingly, the faith in the specifications apparently leading to a prototype "12V" PSU design which is (and here is where we can all be sure) failing due to the simplistic PWM design. • You will be wanting to know if the mark/space ratio, or duty cycle (however you want to name it) of the microcontroller output is being reflected in the actions at the output of the power transistor, and thence eventually to the fans. ## PWM-Lüfter steuern: Anschluss-Belegung der Lüftersteuerung A PWM generator is used to generate budiaceho signal for spínanú control. As a source of PWM the signal is used, the integrated circuit TL494 PWM signal for switching of the upper trigger is created using the outputs C2 and E2. The collector (C2) is connected to 5V power supply, which is in introduced to the emitter (E2) The PWM PST F9 case fan outperform generic case fans thanks to the PWM Sharing Technology (PST). Regulates the speed of up to 5 fans via BIOS PWM Lüfter und RGB Control Hub Ventola PWM e Hub di controllo RGB PWMファンとRGBコントローラーハブ PWM팬과RGB컨트롤러 風扇控制器 风扇控制器 AFAN: PWM port (4pin) D C B LED: ARGB port (3pin) F G E A C D B F E G ARGB Signal connector, plug into the motherboard ARGB header PWM signal connector, plug into the PWM. Gound gives a path for the energy to go. You should be separating your analog and digital ground planes.The edge rate from the Arduino I/O pin, and the NPN connected to it, transitions from LOW to HIGH incredibly fast. There is a lot of what we call “high-frequency content” in that edge. That’s what is making its way onto the hall-effect sensor. All of those little spikes are EMI noise. A simple solution is to slow down the edge to the OFF to ON transition. Connecting a capacitor from the NPN’s collector to ground slows down the edge into the base of the PNP. The current limiting resistor (R1) and capacitor (C2) form an RC network, which reduces much of the noise.Can you discuss what it means to be PWM switching a brushless DC motor? I’ve ripped apart a similar fan to peak under the hood and it used a CC6407 chip to switch the coils on my fan. I was able to use a 1khz PWM driver to vary its speed but did not monitor the tach for this. It seems to me that as long as your PWM frequency allows the fan’s IC to operate normally it shouldn’t be a problem, though maybe not particularly efficient. Foundations. The Foundations section gives you some specific knowledge about the principles and techniques that are behind the Arduino platform, its whole family of boards and the software you use to tell your boards what to do. If you want to get some knowledge before you start using things, this is the right place The NF-A14 is a premium quality quiet 140mm fan with a square frame that complies with Noctua's AAO (Advanced Acoustic Optimisation) standard. Its square shape and 140mm mounting holes (124.5mm spacing) make it ideal for use on watercooling radiators or as an upgrade for 140mm case fans. Featuring sophisticated aerodynamic design measures such as Flow Acceleration Channels, the NF-A14. SPLITTY9 ACTIVE is an active ninefold splitter for 4-pin PWM fans featuring separate power supply, PWM signal amplification and adjustable switching threshold. SPLITTY9 ACTIVE has significant advantages over a passive splitter. Power supply through SATA connector Fans connected to the splitter are not supplied from the fan output, but from a SATA power connector to be connected directly to the. ### current community Die Drehzahlregulation über die Spannung hat einige Nachteile, die Intel mit der Einführung des PWM-Anschlusses (2004) beheben wollte: Wie funktionieren die PWM-Pins am Arduino? Wie kann man analoge Spannungen auslesen und anzeigen? Das erfährst du in diesem Video! Und das mit Beispielen und verschiedenen Möglichkeiten, wie du. - PWM Signal vom Mainboard abgreifen - Strom via S-ATA Stecker bekommen-> 5 Lüfter werden identisch gesteuert über einen Mainboard 4Pin PWM Header Für wen lohnt das Teil: - Nutzer mit vielen PWM-Lüftern und wenigen Anschlüssen und fehlendem Platz / Geld für eine große Lüftersteuerun PWM-Lüfter Steuern: Anschluss-Belegung der Lüftersteuerung. Vor allem bei aktuellen PC CPU- Gehäuselüfter obligatorisch und sind. Während ein Gehäuselüfter, Wie bereits der Name is andeutet, direkt im Gehäuse und wird befestigt oder Luft in das Gehäuse aus dem befördert, ist der auf einem CPU-Lüfter mehr oder weniger großen Kühlkörper befestigt, der direkten Kontakt zur cappello CPU Thank you very much for this interesting and detailed article. I am an Arduino hobbyst and usually i make them for educational purposes. I have faced similar problems at the beginning. But after reading this i suddenly understood it. I am not an engineer sadly an my electronic knowledge is very little. Can i use different types of NPN PNP transistors? For 12V DC pc fan . Most likely i use BC 547,557. Ich habe also nach einer Lüftersteuerung gesucht, die das PWM-Signal vom Mainboard aufgreift und zudem einen Regeleingriff bietet, den Strom für die Lüfter aber NICHT über das Mainboard bezieht, da ich mehrere Lüfter anschließen möchte, ohne dabei Anschluss des Mainboards zu überlasten You can actually run the PNP-transistor without an “awkward voltage divider” by simply adding a single diode instead of an additional NPN-transistor. Even for your open-collector driver you actually should provide a resistor between base and +12V for the PNP for highest reliability. The first one will be the frequency of the PWM signal generated to control the LED. We will use a value of 5000 Hz. Note however that the maximum values for the frequency are not yet very clear and in the header file of the functionality we are going to use is stated that the maximum frequency depends on the resolution chosen OK, just took the plunge and re-wired the fan from 12V to 5V. To my surprise it did start no problem, and is going quite strong with more than sufficient torque - unlike another fan (non-PWM 120mm PSU fan), which doesn't start even at 7V by itself and the torque is very faint when eventually started manually Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up.BTW James, no flyback diode on the fan’s pins? Are we assuming one already exists inside the fan or none is needed in this case? Having received dozens of awards and recommendations from international hardware websites and magazines, the NF-A20 has established itself as a default choice when it comes to premium-quality 200mm fans. The chromax.black.swap edition combines the NF-A20's signature quiet cooling performance with an attractive all-black design and a bundle of swappable red, white, blue, green, yellow and. Perfekte lÜfter-regulierung durch pwm: die pwm-funktion signalisiert über das Motherboard exakt mit welcher Geschwindigkeit der Lüfter laufen muss. 54w, 2x usb header software-steuerung, 6x 4-pin pwm, 15pin s-aTA Stromversorgung, Corsair Li Bis zu 10 unabhängige PWM Lüfter ### pwm - Using 12V fans with a 24V PSU - Electrical 1. As far as I understand it, the controller board uses a PWM signal to achieve variable speed for the fans. The PWMs are generated using a sigma-delta algorithm with a 1ms base period. It means the fan power suppply is a 24v signal consisting of 1ms power pulses followed by the necessary number of 1ms no-power cycles to achieve an average power. 2. Product information - NF-A12x15 PWM chromax.black.swap Lüfter - 120mm PWM-gesteuerter Premiumlüfter von High-End-Hersteller Noctua im 120-mm-Slim-Format. Als Teil der chromax.black.swap-Serie zeichnet sich der NF-A12X15 PWM neben hervorragender Technik und Leistungsdaten durch die komplett schwarze Farbgebung und die wechselbaren Anti-Vibrations-Pads aus 3. The 3-Pin being everything but a Speed Control (PWM) signal wire, that is.. they still send a Tach signal.. along the same wire, in the same position as the original 4-Pin configuration. [And the Best part] - is the 4-Pin PWM Fan running in a 3-Pin scenario runs at its Top speed, which for this fan is 1600 RPM, far below the 2200 RPM I had seen. 4. Content provided on this page contains information and standards formerly located on the formfactors.org website. Information is provided to help in the design and development of related motherboard form factor compliant computer systems. Some of the information is considered legacy and provided for form factor reference Driving the fan with 12V directly and read RPM via the third pin, then yes I tried it and it does run at 5034 RPM according to the Arduino. It’s pretty weird cause I can read the value without the capacitor but as soon as I use a 180nF the Arduino says 0 RPM even though the fan is running full speed. I don’t (yet) have an oscilloscope unfortunately. Thank you for your help It is a weak pull-up, but probably sufficient. Depending on noise, (and your software signal processing) you might need an RC low pass or notch filter for the tach signal. You might want a pull-up or pull-down resistor on the PWM signal so that the fan will be in an ON state in the case of a uC failure Depending on your circuit, you may need to play with that value. Basically, make it big enough to reduce the noise spikes, but low enough that the NPN can still switch the PNP off.Figure 1. The RMS value of a squarewave is \$ V_P \frac {1}{\sqrt 2} \$. Source: Mastering Electronic Design. ## Video: PWM a 3-pin PC fan with an Arduino - Bald Enginee ### Lotusgrill XL Lüfter Upgrade, Reparatur - YouTub • Hello James 🙂 , I’m a huge fan of your work (from Tunisia :p ) because it helped me a lot in understanding the basics of electronics. and I would appreciate if you can answer my question 🙂 . So in this article, in figure 3, you placed the fan in between the collector of the PNP transistor and the ground in this high-side switch situation. But in this article ( https://www.baldengineer.com/the-best-4-transistors-to-keep-in-your-parts-kit.html ) you said ” A high-side circuit is where the load is placed between the emitter and ground ” . So can you clear this for me a it more and tell me how to place the pnp correctly ? and thank you 🙂 . PS: i’m using this high-side switch to charge a 6v battery by a 9v input voltage. • imum specified RPM. The fan RPM (as a percentage of maximum RPM) should match the PWM duty cycle within ±10% • Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a method of reducing the average power delivered by an electrical signal, by effectively chopping it up into discrete parts.The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods. • imum specified RPM. The fan RPM (as a percentage o • Before anyone takes any of their time to answer I have completely changed my design, got rid of the 555 timer and changed the PWM frequency of arduino pins up to 31.25kHz (Since I have the RPM working I thought I would not need to use normal fan PWM frequency of 25-28kHz as arduino can now do everything). I found this frequency to give the least noise and most reliable RPM values. noise filtering capacitors of 82nF and 8pF for the transistor and RPM wire respectively (if I go higher on the RPM wire I get a higher value when at low duty cycle). I have used different transistors (S8050 and S8550) but hope this is useful to everyone. I have used the EnableInterrupt library on the arduino so you can have more RPM sensors (as I am building a 4 fan channel and 1 LED channel controller). • For this discussion, Darlington is the same as a NPN. While the TIP120 is popular with hobbyist, it isn’t very practical. Modern MOSFETs and BJTs exceed its capabilities, significantly. • Draft saved Draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Submit Post as a guest Name Email Required, but never shown PWM Fans. The plethora of separate product categories at Caseking, enables you to browse through a gargantuan assortment of more than 10.000 items to find exactly what you require - starting with hose clamps right through high-end graphics cards or from gaming mice to the super PCs and from notebook PSUs to 4K Ultra HD monitors The PWM fan speed control feature is a function that externally controls the rotation speed of the fan by changing the duty of the input pulse signal between the control terminal (PWM) and ground (GND). As far as I know, the PWM input is a TTL level signal, and includes a pull-up resistor to 5V (or to 3.3V) in most constructions You have been given plenty of information to work through from all of the valued contributors who have helped here with your problem, and yet there are still too many unknowns to give accurate answers to all of your questions, now that I have had a bit more time to think my way through it all.Most tutorials show an NPN transistor driving a motor as a low-side switch. However, the problem with this approach is that you are switching the ground (GND) path. This method doesn’t provide a return path when the FAN is turned off. Regarding the fan’s operation, it will turn on and off as you expect. However, the lack of ground path means the switching can create electromagnetic interference (EMI). • Sowohl 3-Pin-Lüfter als auch 4-Pin-PWM-Modelle lassen sich in ihrer Drehzahl beeinflussen. Die Prinzipien sind allerdings zwei verschiedene: • The PWM signal I'm looking at is intended to control the speed of a fan motor. This is unlikely to be the case here. Mamo's gyro is likely intended to drive an RC servo, which means it is looking for a 1 to 2 millisecond pules (at anywhere from 40 to 60 Hz) • Arctic F14 PWM PST Lüfter 140mm Art-Nr.: 90661319, Manufacturer's no.: ACFAN00079A. 4 Review(s) The PST assures that all of your fans listen to one control signal. E.g. you share the CPU Cooler's PWM signal and assure that your case fans stand down at low load and spin up whenever necessary • If your 12 V supply results in a current of \$ i \$then doubling the voltage to 24 V will result in a current of \$ 2i \$. Since power is given by \$ P = VI \$then the instantaneous power goes from \$ 12 i \$to \$ 24 \cdot 2i = 48i \$or up by a factor of 4. At 50% duty cycle that will be double the power of a constant 12 V supply. • Now three suggested answers to the question: 1- If the fans as dismantled are modifiable to run on their originally rated 12V, then do so and put a 12V regulator in the 24V feedline to them. Use a series resistor with the regulator if necessary to keep the regulator within thermal spec. 2- You bought a 3D printer. Just a tiny fraction of a percent more cost at the local electronics shop will buy you a 12VDC supply to run all three fans. Wiring them in will be a breeze compared to what you have done already. 3- buy 24V fans as you suggest. Quick, simple, elegant. I would do that. Noctua NF-A20 - open box. The accessories that come with the FLX fans: a package of four standard fan screws, a 3-pin extension line, a 3-pin voltage reducing adapter (contains a resistor but does not get too warm; Noctua calls this a Low Noise Adapter, AN-R13) a 4-pin adapter drawing 12 volts from the PSU, a set of flat-ended vibration-reducing fan mounts and a set of four double-ended. I’m not familiar with the BC747. Make sure the I/O pin you’re using supports PWM. (Deleted my previous reply, got confused by my own code.) Pwm anschluß. Optimal zum anschließen weiterer Lüfter für eine ausreichende Belüftung und Kühlung des PC. Zur festplatten-Entkopplung. 0, 15m. Sauberes Kabelmanagement, einfache Installation. Y-kabel, 0, 15 m, 4-polig 4 pin pwm lüfter auf 2x 4 pin pwm lüfter y-kabel 15 cm + PWM Lüfter Verlängerungskabel 30 cm. Kompakte Abmessungen. ## PWM Regulated Fan Based on CPU Temperature for Raspberry P The hall sensor is still a bit noisy, especially on the rising edge. The falling edge is pretty clean. So even though this signal is active HIGH, I decided to measure the falling edge. I did find adding some additional capacitance on the sensor signal helps clean it up a bit more. You could also consider playing around with an external pull-up resistor to for a similar RC like filter.I really don’t remember. Probably a 2n3904 and 2n3906 or something. They were whatever NPN and PNPs I had in my kit. Bei PWM wird das digitale Signal in einer sehr hohen Frequenz immer wieder ein- und ausgeschaltet, um ähnliche Ergebnisse wie die eines normalen analogen Signals zu erhalten With the 4-pin pwm to 3-pin transformer, all 3-pin fans can now be controlled with a normal PWM signal. Now your 3-pin fan can be controlled like any other PWM fan. Controlling 3-pin fans through a PWM signal was an unsolvable problem - until now. This means you can use a Y-splitter to control several fans simultaneously through the converter ### DIY Fan Controller for PWM Fans - Overclocker •$ pacman -S wiringpi $gpio mode 1 pwm$ gpio pwm-ms $gpio pwmc 1920$ gpio pwmr 200 # 0.1 ms per unit $gpio pwm 1 15 # 1.5 ms (0º)$ gpio pwm 1 20 # 2.0 ms (+90º) $gpio pwm 1 10 # 1.0 ms (-90º) Note: My servo expects a 50Hz signal • Perfekte lÜfter-regulierung durch pwm: die pwm-funktion signalisiert über das Motherboard exakt mit welcher Geschwindigkeit der Lüfter laufen muss. Zum beispiel teilst du dein cpu kühler pwm signal und stellst damit sicher, kannst du auch mehrere Gehäuselüfter parallel schalten erst ab 10 Lüftern ist der Geräuschpegel erst doppelt so laut • 1 \$\begingroup\$I am unable to answer most of your questions but would point out that 50% duty cycle on 24 V supply will not result in 12 V average. We need to calculate the true RMS values of voltage and current. • d this type of circuit is not appropriate to directly charge a Lithium Polymer or LiPo style battery. • Good catch. The older article was wrong. This article shows the correct configuration for a high-side switch. • Newer fans should accept a 3.3v PWM signal, otherwise you may need to drive it through some type of voltage translation (typically just a MOSFET). The extra wire is a tachmoeter signal that can be used to detect if the fan is actually spinning or not ### Aquacomputer SPLITTY9 ACTIVE - aktiver Splitter für bis zu 1. EVG Elektro-Vertriebs-Gesellschaft Martens GmbH & Co. KG Trompeterallee 244-246 41189 Mönchengladbach +49 2166 5508-0, Fax +49 2166 5508-90 info@evg.de, www.evg.d 2. An intelligent start boost function with monitoring of the speed signal can be activated for each channel to start the fans safely. All fan outputs are exclusively suitable for PWM fans with four-pole connectors and are protected against overload. RGBpx control unit for addressable LED 3. Hi James, a lil’ question: may you add at the post, or give me here the list of the components have you used for this example? For me It’s gonna be hard to replicate it without. sorry 🙂 4. Die Informationen sind nicht mehr aktuell Ich habe nicht genügend Informationen erhalten Die Informationen sind fehlerhaft Ich bin anderer Meinung Sonstiges Antwort abschicken Vielen Dank, dein GIGA-Team 5. The SPLITTY9 ACTIVE from Aqua Computer offers space for up to 9 PWM fans. In contrast to passive splitters, the SPLITTY9 has three special features: voltage input, PWM signal amplification and an adjustable turn-on threshold. With the.. 6. OK I’m good. I switched the 2N3906 for a BC327 and used a 500 ohm resistor on the gate. Thank you 7. Controlling 3-pin fans through a PWM signal was an unsolvable problem - until now. Phobya has tackled this problem and now presents an elegant, simple solution with the 4-pin PWM to 3-pin converter. With the 4-pin PWM to 3-pin transformer, all 3-pin fans can now be controlled with a normal PWM signal ### your communities 0 \$\begingroup\\$ It's been an interesting discussion, and now, to help with answering the questions, It really is time to use an oscilloscope (I know you have not got one, but...) and begin some diagnostic checks of the smoothie controller board, the feed between the microcontroller and the power transistor gate/base, the input and output of the power transistor (checking with the oscilloscope, not your multimeter) and checking what is happening to the waveform and absolute voltage at their peaks, at the fan motors. Changing the Arduino PWM Frequency Ed Electronics Workbench , Software 2009-02-21 2009-02-23 The default PWM frequency for PWM 3, 9, 10, & 11, at least for the Diecimila running at 16 MHz, is 488 Hz Thanks for taking the time to put up the comprehensive article! Very helpfull in researching how to make a fan driver to drive a larger fan at a lower RPM than the host controller accepts. Fiddled with https://circuitdigest.com/microcontroller-projects/arduino-waveform-generator to add a fake RPM output signal to satisfy the host controller and used your sketch and circuit to drive the fan at the desired speed.

For the most part. I didn’t include pull-up resistors on the driver stages which will be needed for a FET. LÜfter-geschwindigkeit: 1. 350 rpm @ 12v dc. Länge 260 mm, 2 pack Computer Fan-Splitter-Kabel. Unterstützt 2 pwm-lüfter aus einem einzigen Motherboard PWM header. 1 bis 2 pwm lüfter Splitter Konverter. Kompatibel mit 4pin PMW Lüfteranschluss und Lüfteranschluss 3pin. Schwarz gesleevte PWM Lüfter Splitter ist bequem zu bedienen

## ESP32 Arduino: LED PWM fading - techtutorials

Voraussetzungen¶ Mit Hilfe von LM-Sensors und eines Konfigurationsskriptes lassen sich die Lüfter im System, die per PWM angesteuert werden können, dynamisch. Du brauchst einen Transistor, weil Du den Arduino mit 12V kaputtmachst. Hab nicht nachgeschaut, aber es könnte sein, daß ohne PWM -Signal der Lüfter gewollt max If we add a NPN transistor before the PNP, it can be used to switch the high-voltage supply on and off. This driver would allow the PNP’s base to see a wide voltage range. The NPN can pull the PNP’s base, with its current limiting resistor, to 12 volts. This mode will prevent 0.7 volts from dropping across the Base-Emitter diode keeping the transistor OFF. When the NPN drops to ground, then VBE becomes active, and the transistor turns on. PWM Regulated Fan Based on CPU Temperature for Raspberry Pi: Many cases for Raspberry Pi come with a little 5V fan in order to help cooling the CPU. However, these fans are usually pretty noisy and many people plug it on the 3V3 pin to reduce the noise. These fans are usually rated for 200mA which is pretty.. Für lüfter mit 4pol. Perfekte lÜfter-regulierung durch pwm: die pwm-funktion signalisiert über das Motherboard exakt mit welcher Geschwindigkeit der Lüfter laufen muss. Pwm anschluß. Zum beispiel teilst du dein cpu kühler pwm Signal und stellst damit sicher, dass deine Gehäuselüfter nur hoch und runterdrehen, wenn es nötig ist

I created a simple serial interface (single character commands) to adjust the PWM speeds. There is a one-second interval used to display current RPM. The interrupt is used only for counting pulses from the hall effect sensor. However, I don’t think even that is necessary. (Maybe something to tackle in another tutorial.) RPM calculation is pretty basic, but seems to work. My fan is rated for 1200 RPM and I’m measuring 1250ish. The slowest I can seem to run this fan is 600 RPM.Thank you for this article. I quickly put together a fan circuit with an N FET and then realized the tacho wouldn’t be grounded during the pwm off cycle and needs either a PNP for switching or a zener on the tacho, so I looked up how others have done it. Stack Exchange Network Stack Exchange network consists of 177 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Espurna uses alternative PWM library that runs PWM at 19.6 kHz (for MY92XX provider) and 500Hz (for regular GPIO PWM). Normal ESP8266/Arduino runs PWM at 1kHz. You can try changing frequency to 25kHz and see how your ESPurna behaves. You can do that by changing LIGHT_MAX_PWM parameter to 200 (either in custom.h or in general.h)

## PWM Lüfter order online CASEKIN

The supplied 120 mm case fan from the new Slip Stream 120 SLIM series has the dimensions of only 120 x 120 x 12 mm and Respectively 4.72x4.72x0.47 in. The fan speed can be easily controlled by the motherboard's PWM signal which allows very flexible and silence optimized cooling. Product page / Detail How does this high-side dual-transistor circuit compare to just using a Darlington (TIP120, say)? My impression was that Darlingtons get around the post-shutoff issue you mention above by providing a parallel path to ground via a diode, but I’m not 100% sure that addresses the same issue you bring up, nor how it compares in performance (both in terms of EMF and power usage). Would love to hear your thoughts on this! Bei PWM gibt es keine Anlaufspannung (dennoch eine Mindestdrehzahl der pWM-Lüfter, die aber meist viel niedriger liegt als beim Nicht-PWM-Lüftern) und auch das Problem der Abwärme entfällt. Allerdings benötigen PWM-Lüfte reinen zusätzlichen IC im Motor für die Verarbeitung des PWM-Regelsignals, das über die 4 Yes C1 is a filter. For a long distance wire you probably need a much strong pull-up. Something in the 1-4.7K range. Anything below 1K and you should probably reconsider your design. Maybe an op-amp on the transmit (and receive) side to boost up the signal’s voltage to account for loss in the wire.I bought a three pin ebmpapst 512 F/2 (5’000 RPM), followed Figure 6 (using a 2n3904 and a 2n3906) and used your code on a Arduino Uno and oddly enough: – I can’t make the fan run at its full speed it seems to max out at 3’056 RPM (PWM: 255) – And reading RPMs is less stable with the capacitor than without. Without I get a pretty stable 3’056, and when I add the cap, it sometimes jump from 3056 to 3116 and back to 3056

The adjustable switching threshold allows PWM fans to be switched off, which are usually unable to do so. For this purpose, the rotary knob on the splitter is set accordingly. If the incoming PWM signal is below the threshold, the power supply of the fans is switched off. Technical Data: Maximum power: 4.5 A; Dimensions: approx. 57 x 39 x 16 m Heute ein weiterer Teil aus der Mikrocontrollerreihe. Mittels PWM lassen sich LEDs und Motoren sinnvoll in Leuchkraft bzw Geschwindigkeit regeln, Servos präzise verstellen. Weitere Infos gibt es. I have 9 x 12v 1000 rpm PC fans spread across several metres of shelving, some tacho wires are up to 3 metres long, at this length the signal is not stable enough to read using your example code, I’m running the fans directly from a clean 12V supply (240V AC to 12V DC) so no noise introduced via any PWM. Do you have any suggestions on cleaning it up? (I have no oscilloscope unfortunately so can’t look at the signal). The fans work great at 1 metre or less when using the Arduino 20k pull-up. Für Links auf dieser Seite erhält GIGA ggf. eine Provision vom Händler, z.B. für mit oder blauer Unterstreichung gekennzeichnete. Mehr Infos.GIGA.DEMicrosoft WindowsPWM-Lüfter steuern: Anschluss-Belegung der Lüftersteuerung erklärt (an 3- und 4-Pin-Anschluss)PWM-Lüfter steuern: Anschluss-Belegung der Lüftersteuerung erklärt (an 3- und 4-Pin-Anschluss)GIGA-Redaktion , 23. Jul. 2015, 09:40 Uhr 7 min LesezeitKommentare10Gehäuse und Prozessor-Lüfter finden sowohl in älteren als auch aktuellen Computern Verwendung. Dabei gibt es allerdings einige Unterschiede zu beachten. So gibt es auf Mainboards in der Regel einen vierpoligen und diverse dreipolige Lüfteranschlüsse, die für verschiedene Einsatzzwecke konzipiert sind. Im Artikel findet ihr alle Informationen über Lüfter-Anschlüsse, PWM-Lüfter mit vier Pins, der Anschluss-Belegung und der Möglichkeiten, wie man Gehäuse- und Prozessor-Lüfter steuern kann.

### more stack exchange communities

Phanteks y kabel für 4 pin pwm lüfter. 2.90 €. Schwarz gesleevtes Y-Splitter-Kabel von Phanteks zum Anschluss zweier 4-Pin-Fans an einem PWM-Lüfteranschluss 4 Pin PWM- Y Splitter Fan Cable Female to Male with fast shipping and top-rated customer service Today we are going to learn how to read the RPM of a PC Fan. This also works well for the Water Pumps used in PC Water Cooling as well as any dc pump or fan that has a rotation sense wire. This is accomplished by counting the falling edge of the square wave generated by the Hall effect sensor that is located inside the fan or pump. All we have to do is use the arduino to do i Brushless motors have a controller that controls the speed. If it doesn’t support PWM, it will have reduced torque and likely generate a ton of EMI.

Lüfter mit lediglich zwei Anschlüssen (Pins) werden in der Regel nicht in einem typischen Heimrechner eingesetzt. Pin 1 wird dabei immer für die Masse, Pin 2 für die Versorgungsspannung verwendet. Pin 3 ist für das Tachosignal zuständig, während über den optionalen vierten Pin für PWM-Lüfter die Geschwindigkeit bei gleichbleibender Spannung geregelt werden kann. Bei Lüftern mit dreipoligen Anschlüssen lässt sich die Drehzahl indirekt (nämlich über die Spannung) kontrollieren  (mehr dazu weiter unten im Artikel). Perfekte lÜfter-regulierung durch pwm: die pwm-funktion signalisiert über das Motherboard exakt mit welcher Geschwindigkeit der Lüfter laufen muss. Arctic cooling Fan F9 PWM Rev. 2 gehäuselüfter lange betriebsdauer: das hydrodynamische gleitlager ist mit einer Öl-Kapsel ausgestattet, so dass ein Verlust des Schmiermittels vermieden wird. A question came up on IRC regarding how to PWM a 3-pin PC fan with an Arduino using analogWrite (). Controlling the fan was seemingly straightforward. The problem was that the hall effect sensor, or TACH signal, was incredibly noisy. The noise made it impossible to measure the fan's rotation. Working through the question, I found three issues. PWM-Lüfter angeschlossen werden können. Das PWM-Signal empfängt der Hub vom Mainboard, die Stromversorgung entweder über einen SATA- oder einen Molex-Stecker eines Netzteils. 3-Pin-Stecker lassen sich ebenfalls an dem Hub anschließen. Technische Details: Anschlüsse: 10x 4-Pin-PWM 1x 4-Pin-PWM für den Anschluss am Mainboard 1x SATA 1x Mole

Only ONE ideal fan with its constant, steady current, will discharge the 22uF capacitor just enough to keep it at a "ripply" charge state of approx.12V PWM Fan Adaptor für VGA Lüfter (CA-PWM-02) Regulie die Drehzahl der 4pin PWM Lüfter durch das PWM Signal der Grafikkarte. Merkmale Mit Hilfe des Adaptors kann der Anwender viele PWM Lüfter an einem PWM Kabel anschliessen. Es ist geeignet für AMD und Nvidia Referenzkarte mit 4 Pin PWM Lüfter Anschluss

## Video: Reading PC Fan RPM with an Arduino The Makers Workbenc

### be quiet! Shadow Wings 2 140mm PWM, BL087, Cooling Fa

• Here is a schematic of the dual-555 PWM generator. This circuit boosts the existing PWM signal using an inverted schmidt buffer which was suggested by bing at overclockers.com forums: A more powerful PWM generator. Using the 556 Dual Timer. The 556 timer is a single 14-pin package which contains two 555s. If you would rather build the.
• And you will be doing those diagnostic checks so you can come back here and provide more background information to the questions you have asked. Good luck.
• In Figure 3, I’m showing what happens with the NPN-PNP driver when the Arduino drives 5 volts. It turns on the NPN, which connected the PNP’s base resistor to ground. This path allows 0.7 volts to drop across the PNP’s Emitter to Base junction. The transistor turns ON and the motor spins.
• Bei einem PWM-Lüfter ist neben diesem Faktor aber auch (wie bei anderen Lüftern) auf die Drehzahl, den Airflow und die Lautstärke zu achten. Wer sein Gehäuse leise halten will, sollte sich das vielfältige Angebot der Silent-Lüfter mit PWM-Signal ansehen, die durch spezielle Techniken wie einem speziellen Lager oder angepassten.
• Y-kabel für lüfter pwm, 4pol molex 1Stecker/2Buchse für Lüfter mit 4pol. Pwm anschluß 4pol molex 1 Stecker / 2 Buchse. Zum beispiel teilst du dein cpu kühler pwm Signal und stellst damit sicher, dass deine Gehäuselüfter nur hoch und runterdrehen, wenn es nötig ist. Ähnliche Produkte
• ML120 PRO 120mm PWM Premium Magnetic Levitation Fan. Corsair ML120 PRO delivers unrivaled performance and silence by utilizing magnetic levitation technology and custom rotor design. The innovative design provides both high static pressure and high air flow

Pwm digitale signale in analoge Signale von 0 bis 10V. 0 bis 10 v analog-signale umzuwandeln Sie digitales PWM-Signal. Leistungsbereich input: 12V-30V Netzanschluss: mehr als 100MA. Wire range 26~16awg, screws m2 steel, strip length 5mm, pin header and cage brass During the development of the new P12 PWM PST, special emphasis was placed on a focused airstream and thus a high static pressure. The fan guarantees extremely efficient cooling, even with increased air resistance. Therefore, the P12 PWM PST is particularly suitable for use on heatsinks and radiators The proper way to power a fan is with a high-side switch. This circuit type switches the high voltage on and off, instead of ground. But you can’t use a NPN. Figure 1 shows the problem. When configured as a high-side switch the voltage from across VBE remains 0.7 volts. Which means if there is 5 volts at the base, you only get 4.3 volts at the collector. You were probably expecting it to be 11.3 volts, weren’t you? Well, that’s not how a NPN BJT works. So this is a bit of a continuation on my 555 timer based PWM controllers, but now using microcontrollers and MOSFETs instead of 555 ICs and transistors. I made 2 versions, one with switches for speeding up and down and the other with a potentiometer like the previous controllers

### Amazon.com: Phobya PWM Fan Adapter for Graphics Cards ..

• Beigetreten: 28.04.2015. Letzter Bes: 30.08.2019. Beiträge: 29. Bewertung: (0) Hallo, habe da mal eine Frage: Ist es möglich einen 24V Lüfter per PWM Signal zu.
• imalen ~400 Umdrehungen laufen zu lassen, dabei sind sie natürlich vollkommen leise und haben (für mich sehr sehr wichtig) keine nervigen PWM- oder Lager Geräusche
• - die Förderleistung variiert zwischen 24,5 und beeindruckenden 106,2 m³/h
• Hallo, ich habe versucht an meinem GT2560 einen Lüfter anzuschließen in der Hoffnung damit mein Modell kühlen zu können. Das Ganze sollte über den PWM Ausgang erfolgen und mit der Lüftersteuerung im Repetier Host V1.6.2 gesteuert werden. Nun ratet mal ;-) genau, es läuft nicht :-( Also habe ich de
• PWM Lüfter und RGB Control Hub Ventola PWM e Hub di controllo RGB PWMファンとRGBコントローラーハブ PWM 팬과RGB 컨트롤러 風扇控制器 风扇控制器 A FAN: PWM port (4pin) D C B LED: ARGB port (3pin) F G E A C D B F E G ARGB Signal connector, plug into the motherboard ARGB header PWM signal connector, plug into the PWM.
• Some fans simply won't spin, some will spin only reluctantly ("wobbling" between two speeds for certain command values, spinning only when commanded at 75% or above), and all are far noisier when used in the printer than when plugged into a 12V PSU.
• Yes, the 4-pin fans have a PWM input, which can be driven from an Arduino using a small signal NPN transistor, a small signal N-channel mosfet, or even just a diode. The PWM frequency is supposed to be 25KHz, which can be generated from timer 1 or 2 on a Uno if you don't need to use the other PWM pin on the same timer for PWM

Mit diesem PWM Splitter von Phobya besteht die Möglichkeit bis zu 6 PWM Lüfter gleichzeitig mit Strom zu versorgen und auch das PWM Signal des ersten Lüfters auf alle 6 Lüfter zu übertragen. Dieses macht beispielsweise für große Radiatoren Sinn. Der Splitter ist sehr kompakt gebaut und im Gehäuse leicht unter zu bringen The big brother of the well known Kama PWM 92 mm comes with a rpm range from 310 ~ 1200 and can be used with pwm signal. Use without PWM at a constant rpm is possible as well. Product Pictures. News» Products» Fans . Specifications. Model Name: Kama PWM Fan 9 cm Kama PWM Fan 12 cm Ein PDM-Signal kann auch mittels eines analogen Komparators durch Vergleich des Analogsignals mit einem geeigneten Trägersignal erzeugt werden, wie in nebenstehender Schaltskizze dargestellt, wobei als Modulationssignal vor allem Sägezahn- und Dreieckssignale zum Einsatz kommen: . Ansteigendes Sägezahnsignal (rückflankenmoduliert): Die Vorderflanke (ansteigende Flanke) der Schaltfunktion. I made the assumption the built-in motor controller has the proper diodes, since it is highly unlikely a PC motherboard would have had any. That is one of the key reasons a high-side switch is needed. Splitty9 is a universal ninefold splitter and can be used for 3-pin fans, 4-pin PWM fans or as an aquabus splitter. When used with a fan output, the white connector marked with the word input is connected to a fan output using the supplied cable.Power supply and PWM signal (if available) are provided to all nine black connectors, additionally the speed signal received from the connector.

A PWM duty state is the percentage of time the PWM controller sends a 5-Volt signal to a fan. You can get 100% simply by supplying 12 Volts and not connecting the fourth wire. You can get a 0% duty state by grounding that fourth wire. To get something in between you need a PWM controller All of the noise spikes shown are finding their way into the I/O pin. It falsely triggered the interrupt, messing up an RPM measurement. So what’s going on here? Where are those spikes coming from? The spikes are EMI from high frequencies in the PWM signal. The Arctic F Pro PWM employs the same technology to absorb vibration and prevent it from transmitting across other components within the case. [65] Arctic claims to be the patent holder of the PWM Sharing Technology, namely PST, which shares a single PWM signal with all the other PWM controlled devices connected to the motherboard to control. I have a 3 pin fan circuit but I am not using the Arduino to generate PWM, I have a 555 timer set to hold a frequency of 25kHz and I can adjust duty cycle. The rpm wire of the fan is connected to my Arduino and I have tried using your sketch and a couple of others and found that the readings at 99% duty cycle are almost correct but as soon as I adjust it seems to be reading the PWM signal (RPM reads hundreds of thousands) noise not the hall sensor. How can I get rid of this noise? My 555 timer output is driving an IRFZ44n MOSFET, I have my 12v supply going straight to the fan and the negative of the fan is going to my drain with source connected to the common ground for the power supply and Arduino. It is for PC fan controller I am trying to build and would like to display RPM.Thank you for this article. I quickly put together a fan circuit with an N FET and then realized the tacho wouldn’t be grounded during the pwm off cycle and needs either a PNP for switching or a zener on the tacho, so I looked up how others have done it.

Sorry, uwezimmermann, I don’t follow your first comment. What “awkward voltage divider”? When the NPN transistor is driven with enough base current the C/E junction will saturate, effectively pulling the collector to ground (almost, maybe with a potential across the C/E junction of, say, 100mV, no transistor is a perfect switch). If the base isn’t driven hard enough, then yes, a “voltage divider” might be formed as the C/E junction isn’t fully saturated. When the C/E junction is saturated I really would class the transistor as a switch and not really forming an “awkward voltage divider”. Don’t you agree? I also don’t understand what you mean by replacing the NPN transistor with a single diode? This removes the switching capability if it was to replace the C/E junction of the transistor. If it was to used in place of the B/C of the NPN and was forward biased, then when the input was high the PNP transistor would be forced off (opposite the current configuration) and if the input was low, you would need to have a path to ground to still turn on the PNP transistor.My knowledge of electronics is sketchy at best, I have nothing but a basic multimeter at hand and don't intend to buy an oscilloscope just to debug this pesky fan problem, but still I would be glad to understand what is happening there.Bildquellen: Computer fan plug isolated on white, Computer motherboard isolated on white background with CPU cooler

Ersatz des billigen 5V Lüfter durch einen hochwertigen, leistungsstärkeren 12V Lüfter mit PWM Steuerung. Es ist nun der ganze Drehzahlbereich nutzbar, bei einem vielfachen der Leistung Hey thanks for this awesome post. Can you let us know what NPN and PNP Transistor you used in your circuit? Thanks very much !!

Normally you could do a bunch of math to figure out an ideal resistor-capacitor combination. In my case, I just connected a 390nF Ceramic capacitor for C2 and all was good. I did look at using a 470nF and 1uF electrolytic capacitor. However, those had enough capacitance to even out the voltage creating a constant ~10V, preventing any switching. Additionally, their ESR causes substantial “shelves” to appear on the edge. Stick with ceramics or film capacitors for this type of filtering.i’m using it to charge a gel battery. if it’s also inpropriate to use, Can you suggest me a type of circuit that i can use ?Fan of making stuff beep, blink, and fly. KN6FGY. Oscilloscopes for Rohde & Schwarz North America Creator AddOhms Electronics Channel on YouTube Writer for Hackster News Host Workbench Wednesdays on element14 presents With 20+ years of experience in electronics, marketing, sales, and teaching I boil seemingly difficult concepts down to the core, so that anyone can learn what they need to finish that next great project.I've been scouring the Internet to try and understand what consequences overvolting these fans could have (on the fans themselves and possibly on the power supply), but my electronics skills are not sufficient to figure that out by myself.

Vorteil ist hier dass der Arctic-Lüfter in diesem Zustand komplett anhält, also auch keine Geräusche entwickelt. Bei ca. 27% PWM Signal springt der Lüfter an und verrichtet seine Arbeit super leise. Im normalen Betrieb ist der Lüfter, auch wenn er mit 700 Umdrehungen läuft, nicht hörbar (mein BeQuiet Netzteil ist lauter) The output of the PWM - circuit is used directly to control the fan's speed input (which is pulled up in the fan by about 2.7 k to the 5 Volts supply when disconnected from the TC). The original signal from the Time Capsule circuitry to control the fan is useless so I simply disconnect it A NPN transistor, A PNP transistor, two 1K resistors, wire, a breadboard, and a 3-pin PC fan. I don’t remember what transistors I used, but a 2n3904 and a 2n3906 would probably work, depending on the fan’s current draw.

Instead, we can use a PNP transistor for the high-side switch. This circuit does present a problem when using 5 volts on the base and 12 V on the emitter.So the problem is that when the I/O pin is HIGH or LOW, there isn’t enough voltage to turn off the transistor. And you create an awkward voltage divider between the I/O pin and the base of the transistor. If you looked at the collector (shown as pin 2 in this diagram) on an oscilloscope, you’d see it stay a steady DC voltage. Not very useful is it?

The NF-S12A marks the third generation of Noctua's signature S12 series quiet case fans, which have received more than 250 awards and recommendations from the international press. Featuring a further refined blade design with Anti-Stall Knobs that works in tandem with the new AAO (Advanced Acoustic Optimisation) frame, the NF-S12A improves the airflow/noise efficiency of its renowned. Ich versteh es irgendwie nicht ganz, es geht ein 4pin PWM signal, bsp. Vom mainboard, ein aber auf die lüfter gehen 3pin anschlüsse? Wie werden nun die lüfter geregelt? PWM oder über die Spannung Daher kommt das Problem nicht auf, eine zu niedrige Spannung zu erhalten und dadurch den Lüfter zu stoppen, wenn Sie sich einen PWM Gehäuselüfter kaufen. Im PWM-Signal ist ein Taktzyklus eingebaut, der den Gehäuselüfter in knappen Abständen an und ausstellt. Der Wechsel passiert so schnell, dass er vom Nutzer nicht wahrgenommen wird Hi, thanks for the interesting article. I was wondering what is J1 in the last schema, because I’am not able to understand it only by myself! Thank you!

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