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Questions tagged [fan]

A device that produces air movement by way of blades or surfaces attached to a rotating motor.

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6
votes
4answers
45k views

Calculating the capacitor values to control ceiling fan speed

I have an old ceiling fan motor that runs with a 1.5µF run capacitor, at what I believe is, its full intended speed. With the help of some folks here at StackExchange I've wired everything up as in ...
8
votes
3answers
25k 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 ...
3
votes
1answer
3k 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 ...
57
votes
9answers
28k views

Fan and heatsink - suck or blow?

This question covered it for enclosures. However, from the point of view of the fan attached to a heatsink does it matter whether air is blown through the fins, or sucked through the fins. In other ...
18
votes
5answers
60k views

How to interpret the output of a 3-pin computer fan speed sensor?

I have a 3-pin 12 V computer fan and I want to interpret its speed sensor output. At the yellow wire I get something that looks like pulse-with modulation. How would I interpret the output without ...
11
votes
4answers
15k 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 ...
21
votes
8answers
60k 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.
19
votes
6answers
85k views

How do ceiling fan controllers work?

There are some devices that look like ordinary light dimmers, but are sold expressly for ceiling fan speed control. For example: Lutron Diva Quiet 3-speed control. Unlike an ordinary dimmer, this has ...
1
vote
1answer
499 views

Need advices on an AC fan control circuit

I've setup a small system where I can control an AC Fan by a data-acquisition board's DAC. Here is my final schematics(please left-click to enlarge it): The first issue was to hack the manual speed ...
2
votes
3answers
4k views

Undervolting PC Fan from 12V to 7V

I have a 3 pin 12 V Fan, rated at 2000 RPM max. Its nominal voltage is 12 V which will make it spin at full throttle. That's what is happening when I plug it in the motherboard....
0
votes
1answer
942 views

Calculating the value of the resistance for controlling the speed of AC fan

i have an ac fan that i would like to control its speed i am a bit new in this field so please bear with me i had the idea of fixing 3 speeds with 3 switches one for each speed: (25% 50% 90%), ...
0
votes
2answers
2k views

How do I tell which wires are Red/Positive and Black/Negative on these fans?

thank you for taking the time to answer this question : Here are the fans in question... I only ask because I burnt both fans trying to find the right wires, so I guess I put the wrong wires on for ...
3
votes
1answer
6k views

555 Temperature Controlled PWM

I am trying to build a temperature controlled 555 circuit to drive a cpu fan (used for cooling my entertainment center) I built this using slightly different diodes and MOSFET, and it works great (...
3
votes
2answers
18k 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 ...
2
votes
3answers
25k 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 ...
5
votes
3answers
2k views

Can PWM affect a brushless DC fan given sufficient time?

tl;dr - Is driving brushless DC fans using PWM unhealthy for the fan compared to variable but steady DC voltage? If yes, why and how? The super simple ...
3
votes
3answers
17k views

Control speed of Nidec fan? [closed]

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 ...
2
votes
2answers
7k views

Considerations for solar powered thermoelectric cooler with fan

I am building a food cooler for camping this summer. My plan is to build a thermoelectric cooler that is solar powered. My cooler is looking much like this: including a CPU fan on the hot side ...
2
votes
3answers
13k views

arduino - how to read and control the speed of a 12V - four wire fan?

I want to read the rpm and control the speed of a 12V - four wire fan through Arduino. There are many articles describing the procedure, yet I have some questions. Read Speed: So, 12V and Gnd are ...
1
vote
3answers
89 views

Fan control circuit not working, Fan remains ON

Goal: I am attempting to only turn on the fan when the THERM signal of the temp IC (IC2 in schematic) goes LOW. The IC works in that it triggers an active low on THERM when a temp threshold is ...
1
vote
2answers
275 views

Fan PWM driver - design question

I've been working on crating a simple PWM fan driver for my Raspberry Pi. To simply explain idea - I get 3 pin input (1 - PWM, 2 - 5V, 3 - GND), then using RC filter I turn PWM signal into voltage and ...
8
votes
4answers
7k 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 ...
5
votes
2answers
3k 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 ...
5
votes
1answer
798 views

Why do my RC filter not work as I expect - Yet another fan project

Introduction Okay so this is yet an "electronic newbie Arduino fan" project, but I don't just want to turn my fan ON and OFF but adjust the speed so it's not that noisy and give a more relaxing ...
4
votes
3answers
7k 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 ...
3
votes
4answers
4k views

How to filter noise from fan

I try to make controller for 12V fan, where I can vary voltage from 3V to 12V on this fan. It works OK, but it makes electrical noise on 12V power line. How could I get rid of it? How to filter it, or ...
3
votes
2answers
4k 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 ...
2
votes
2answers
8k views

Solar panel and 120mm Computer fan

Just before I start description my question, I would like to let you know that I am new at this. I am working on a solar air heater for one of my window. I've been researching and reading up on a lot ...
2
votes
1answer
2k views

Learning how my circuit works (PWM a 5V USB fan)

I'm new at electronics (my new hobby) and got a lot of good responds from you guys so hope you can help me out with this one as well. I got this an USB fan that I wanted to modulate by controlling it ...
1
vote
1answer
2k views

Powering a 4-Pin stock CPU heatsink fan with an external power supply

I have scoured this website and the rest of the internet looking for a solution to my particular issue, but as of yet I have not found an answer. If this is a duplicate question I am sincerely sorry, ...
1
vote
1answer
241 views

HVAC fan relay intermittently sticks closed; opens when touched

I have constructed a simple OR gate using two HVAC fan relays to control a 120VAC/1.5A booster fan for my home HVAC system. I have a zoned system, with multiple thermostats, but only one zone/...
1
vote
1answer
4k views

What happens if I reduce the air flow for an exhaust fan?

I'm not very familiar with 220V AC circuits and motors that run on them, so let me explain my question. I'm building a soldering fume extractor for my workbench similar to what is shown in this ...
0
votes
2answers
58 views

Confused on how to wire a Laptop Heatsink/Fan

thank you so much for taking some time out of your day to answer my question. I have bought this Laptop HeatSink/Fan combination and it comes with a molex connector at the end of the wire to attach ...
0
votes
3answers
130 views

Why does a car cabin fan need a big resistor?

The blower motor resistor for the cabin fan in a Volvo 850/V70 is so big that it is not even part of the motor. It has its own mounting. Here is a picture: Why does the blower require such a large ...
0
votes
1answer
258 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
3answers
893 views

12V fan does not work when in parallel but does in series

I am building a food cooler for camping this summer. My plan is to build a thermoelectric cooler that is solar powered. My cooler is looking much like this: including a CPU fan on the hot side and ...
0
votes
2answers
1k views

20v solar panel powering two 12v fans and a 6v pump (swamp cooler for burning man)

Building a solar swamp cooler for burning man, how can I use a 20v 0.8a (in full sun) 15watt solar panel to power TWO 12v 0.4a fans, AND a 6v 0.1a water pump? One of the fans and the water pump have ...
0
votes
3answers
305 views

What's this triac-based device that controls the lamp in my ceiling fan?

I have a Harbor Breeze (Lowes) ceiling fan with a defective light, but with a working fan motor. (A tree fell on my service drop, cutting the neutral wire but not the ground or 240V line wires to my ...
-2
votes
1answer
337 views

4-Pin Fan with PWM dc motor controller(not a fan control unit) [closed]

Can I use a DC PWM module (not a fan control unit) for a 4-pin fan (directly to 12v and GND)? something like this module wiring will be motor+ to red and motor- to black. does this method shorten the ...