A device that produces air movement by way of blades or surfaces attached to a rotating motor.
3
votes
3answers
61 views
DC Fan Control (Switching on/off)
I'm using an MC25060V2 fan, and I'd like to switch it on and off through software occasionally (i.e. not PWM or anything fancy like that). My thought is to either put an NPN BJT or a N-channel MOSFET ...
0
votes
3answers
73 views
How to read RPM from 3-wire fan - PIC18F4550
I am working a PIC µC project. I am using 12VDC PC fan (Coolermaster) for my application. A part of the project is to return the RPM from the third wire of the fan to an LCD.
First of all, How can I ...
1
vote
2answers
70 views
Simulate tach signal of PWM fan
I have a power supply that uses a PWM fan with 4 wires.
Wires: 12V (red), GND (black), PWM Control (brown), TACH Sig (white)
The fan speed is controlled by the PWM control wire (brown). Fan speed is ...
0
votes
2answers
681 views
Arduino controlled PWM PC Fan
I am looking at getting 2 Evercool EC8015HH12BP 80x10mm (4-wire) PWM fans. However, i am looking at controlling the fan speed with the arduino via the PWM pins.
I found the following diagram that ...
3
votes
2answers
174 views
What do the green and yellow wires in a BLDC fan do?
I rescued a box of brand new 'Nidec UltraFlo V60E12BS1A7-09A032 12VDC 2.45A' fans from being thrown away and of course I haven't got the datasheet for them. The closest matching datasheet is here: ...
5
votes
3answers
124 views
What properties vary with the number of blades on a BLDC fan?
In general, what properties vary with the number of blades on a axial BLDC fan when physical and electrical dimensions are the same (e.g.: rated at approximately 12V and 0.15A and 60mm Ø)?
So far ...
1
vote
1answer
160 views
Cutting and resoldering CPU chassis fan power cables
I have a number of chassis fans in my computer which have cables that are way too long. I've been wanting to cut them, but wanted to make sure that I knew what I was getting into before proceeding.
...
-2
votes
2answers
93 views
220 VAC cooling fan to 110VAC? [closed]
Is this possible? I'd like to plug in this fan for soldering projects but it's 220vac and I only have 110vac available. Other specs - 50/60 hz, 0.20 A. Impedance protected. Its a small 15 cm ...
0
votes
4answers
429 views
Undervolting PWM fan from 12V to 5V [closed]
What will happen if I feed a 12 Volts rated PWM fan with 5 V driving voltage?
Given all the other variables stay the same (PWM control signals) - will it reduce RPM? By how much?
What happens to the ...
1
vote
2answers
266 views
Using an LM34 temp sensor, how can I limit the range of temperatures?
Over the next two weeks, I'm going to be building a greenhouse fan system. It's not for a real greenhouse, though. It's just for fun. Anyway, my plan is to use the Dragon12+ board that I have, an ...
0
votes
3answers
258 views
20 Amp automotive thermatic fan PWM controller
I have an older car which tends to over heat in the summer, so a 20 Amp electric fan was added in front of the radiator. Currently its driven by a on / off relay.
I want to build an Arduino PWM ...
2
votes
2answers
214 views
keep bathroom fan running for a few minutes after power off
What is the best way to keep the bathroom fan running after cutting the power to it? I assume a capacitor can be used, but which one should I use and how do I connect it?
0
votes
1answer
223 views
Can I power a fan with a drill battery rather than a bunch of D batteries
So I'm looking into buying a portable fan, most I've looked at run on D batteries (8) aka 12V. Now I don't feel like buying 8 D batteries every time I want to run this thing and I can't find ...
1
vote
2answers
182 views
Simplest way to control the speed of 4 identical fans
Hi, my computer has 4 fans in it running on 12v from the PSU.
How can I control their speed?
Maybe a potentiometer?
1
vote
2answers
276 views
How can I convert the current from a fan to the microphone headset input on an iphone?
I am working on creating an anemometer (or wind meter) for the iPhone. I am a programmer and know exactly how I could do this on the software side of things, but I am a complete noob when it comes to ...
3
votes
3answers
82 views
Use a power supply as a switch
I have some extra fans to cool my Xbox (4). I think that they would drain too much power if I connected them strait to the internal Xbox fan. So I want to know if I have a power suppliy for the extra ...
2
votes
2answers
1k views
Control speed of Nidec fan?
First of all, sorry for my lack of knowledge in the subject. I have a Nidec TA450DC B35502-35 fan which I've installed in a large wooden cabinet where my computer and other electronics sit. This ...
6
votes
2answers
1k views
How do I make an opamp comparator work in schmitt-trigger mode?
I want to control a small 12V case fan. I will set values of R1, R2 and R3 so that the fan will work above temperatures 40oC.
I understand that in these kind of systems, there will be an indecisive ...
0
votes
3answers
251 views
Advanced DC fan controller [closed]
I am wondering if I could get some advice for my final year project. Last year, for my 'mini project' I made a DC fan controller that activated the fan at a specified temperature, to cool it back down ...
-1
votes
1answer
410 views
undervolting processor/mainboard to safely reduce fan speed [closed]
I would like to make my desktop pc less noisier. I do not wish to buy a new cooler, nor fan, nor motherboard. I do not care about decreasing computational performance. The loudest seems to be the ...
3
votes
2answers
1k views
AC fan speed control
I use this fan to cool my room, but sometimes it is too fast and I have to frequenctly turn it on and off to keep normal temperature. Maybe it is possible to reduce the speed by connecting a resistor ...
0
votes
1answer
216 views
Circuit and components for DC Fan
How to make a basic DC fan circuit with an on/off switch (source from batteries). I will be more than happy if I have the schematic and the component needed.
3
votes
3answers
395 views
Cleanest method for measuring the reported speed of multiple computer fans?
This question builds upon this previous one How to interpret output of 3-pin computer fan speed sensor? which was asking about the 'sense' wire output from computer fans.
I am designing a fan ...
0
votes
1answer
3k views
How to slow down a 220V fan? [duplicate]
Possible Duplicates:
what do I need to make 230V AC fan spin slower?
220v AC Fan regulator
I have an old fan with a relay made for 4 different speeds. Currently, they are all shorted ...
0
votes
1answer
117 views
How can I tell what kind of fan controller to use?
I have an HP SAN storage array that has 2 fans on the back. They run at full speed all of the time, and I'd like to slow them down based on the temperature of the hard drives in the array.
The fans ...
0
votes
0answers
120 views
Thermodynamics simulation for electronics
I wanted to try some thermodynamics simulation software for heat/airflow in ic enclosures. I was told that SOTA was Pro/Engineer but that didn't like my system. Will I get anywhere with Autodesk ...
3
votes
3answers
1k views
Why does a speed-controlled computer fan require 4 pins?
A "standard" computer fan has two pins; one for power, one for ground. A three-pin fan adds an additional pin used for the signal from the hall-effect sensor. A speed-controlled fan generally uses a ...
4
votes
2answers
552 views
Why is there a capacitor in parallel with this fan? What is the benefit?
I understand that capacitors store charge, however this circuit is supposed to be a proportional controller. I just dont see why the capacitor is needed. Perhaps to reduce oscillation?
1
vote
1answer
552 views
Which Value of R1 do I use for thermistor-controlled fan?
The MOSFET I am using is IRLU014PBF-ND. I am using a 10k thermistor, and a 24VDC fan, instead of 12vdc.
3
votes
2answers
2k views
Temperature-Controlled Fan
How do I trigger a fans function after a setpoint temperature is reached? I want to avoid using a PID Controller, and my heating element will be external of the circuit. Once the fan cools the ...
1
vote
2answers
562 views
what's the cheapest/fastest way to put a potentiometer on an ac fan?
I'd like to control a couple ac fans running on mains voltage (US) using a potentiometer. I believe they're in parallel but I'm not certain. Each fan is rated at 15/13 watts @ 115 volts
What's the ...
1
vote
2answers
640 views
What if I try to connect a 12V@0.16A computer case fan to my USB port?
What happens if I try to connect a 12V@0.16A computer case fan to my USB port?
Purchased a USB laptop HDD enclosure lately but it coming with no fans.
So I thinking of putting fans around enclosure ...
1
vote
2answers
278 views
Plugging fans inito a USB port
I'm sorry for such a simple question, but I'm pretty much brand new to this stuff.
I want to wire up in parrallel and plug in 3 little fans to a USB for power, however, these 3 fans are 12 volt .12 ...
3
votes
1answer
779 views
Why higher temperatures shorten the lifespan of a PC component?
It is usually advised to keep the temperatures low for every component of a PC. Not only there is a fan (or similar system) for the CPU or GPU, but there are optional fans for RAM, or hard disks.
...
2
votes
2answers
1k views
What causes the increased power consumption of a window air conditioner in the afternoon?
I installed a new 8000 BTU window mount air conditioner on the weekend on a wall that is west facing. I plugged it into a Kill-A-Watt to monitor its power consumption and noticed in the morning, when ...
1
vote
3answers
529 views
Advice making simple solar shed vent from salvaged panel
I have a 10'x10' shed that gets hot as hades inside, and want some ventilation involving pushing air through a hole I would punch in a wall near the roof peak and screen over so my friends the wasps ...
7
votes
4answers
2k views
How do I eliminate PWM noise when driving a fan?
I'm driving a 12V 0.11A brushless DC fan with PWM using an MSP430Gxxxx --> TC427CPA FET driver --> BS170 N-FET. The fan is on the low side of the FET.
Even with a duty cycle of 90% and a frequency of ...
1
vote
1answer
990 views
220v AC Fan regulator
i need to regulate the speed of a noisy kitchen FAN from a microcontroller (arduino board), i have been looking around and checked a lot of websites and schematics, and i think the solution should ...
1
vote
5answers
275 views
Crude/inexpensive AC to DC transformer
I am working on a circuit that is completly powered by 5VDC from a USB port. The circuit uses SSR's to turn on and off 120VAC from a standard wall plug; the 120VAC powers a high-power heater of sorts. ...
1
vote
1answer
365 views
Using a 4-pin computer fan controller without the load
Is it OK if I use the controller from a CPU fan without connecting the motor's coils?
All I want is to use the Hall effect sensor.
The datasheet is posted here, the driving output circuit uses a ...
2
votes
2answers
661 views
Life expectancy of fan with magnetic bearing?
I asked this on Superuser a while ago, but since fans are often used for cooling electronic devices, I think that the question would be on-topic here too.
So how long is life expectancy of fan with ...
3
votes
4answers
6k views
How to interpret output of 3-pin computer fan speed sensor?
This question may be borderline between superuser and here, but I think it's more suitable for this site.
I have a 3-pin 12 V computer fan and I want to interpret its speed sensor output. At the ...
2
votes
1answer
415 views
Do automotive relays come with TVS diodes?
The 500W inductive load question got me thinking. Cars have large radiator fans that often draw more than 15A and are pretty inductive. Do automotive relays have any sort of protection from ...
6
votes
5answers
2k views
Fans: suck or blow?
For a fan, should air be sucked in, or should it blow air out?
I'm talking about an enclosure mounted fan.
