Questions tagged [fan]

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

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1answer
523 views

Computer Power supply fan not spinning with proper voltage [closed]

I have a computer power supply which had 4 blown filter capacitors (3 2200uF/10V and 1 1500uF/16V). The power supply is now working as far as powering a computer goes, however the cooling fan is not. ...
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1answer
167 views

Power supply requirements for a small brushless fan

I've found many resources on the Internet on how to drive a small two-wire brushless fan and to vary its speed. What I didn't manage to find is information on the requirements for the power supply, ...
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1answer
966 views

Why is this switching transistor heating up?

I am building control board for fan cooling. It runs from 12V power source, and it is controlled by input analog signal 0.3V to 1.2V which just controls speed of fan. Problem is that switching ...
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1answer
72 views

Finding battery capacity

So since I do not have a battery balance thing yet I have been working, starting yesterday, on some li-ion cells because I need to find capacity of the cells. And I have a few questions to make sure I ...
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2answers
360 views

Connecting 12V fan to LM317 DIY PSU circuit

I am working on a simple adjustable DIY power supply using an LM317 voltage regulator. J1 in the image below represents the transformer rated at 18VA, which rectified produces about 25V DC. The output ...
0
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1answer
1k views

Use motherboard PWM to control non-PWM fans with MOSFET

So heres my problem: I have lots of fans but most of them have no PWM input. I want to drive clusters of 12v fans by PWM using only one signal. In my spares i found a Fuji Electrics K2647 MOSFET. I ...
1
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1answer
250 views

Can I overvolt a motor when the current stays within the limits?

I have a 12V 0.24A computer fan. When I supply it with the 12V, it drains something like 0.17A. Can I increase the voltage until the current reaches 0.24A or will it destroy the motor?
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1answer
615 views

How to drive 3 wire fan (PC fan) with AVR micro-controller?

I have a circuit already built. A 3-wire fan which a wire is connected to 12V, a wire is ground, and a wire is connected to a pin of an AVR microcontroller. How can I drive this fan and control its ...
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1answer
916 views

Red wire 12V or 5V… How to tell?

This is my first post on Electrical engineering, so bear with me. I'm making a project for school that is supposed to mimic a wind turbine. So, it will use a case fan for a computer as the "turbine". ...
0
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1answer
92 views

Is it necessary to limit a battery's current output?

Is it necessary to limit a battery's current output, or will the load inherently draw no more than is needed? I have a 4S LiPo I want to connect as directly-as-possible to a DC fan of the appropriate ...
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1answer
3k views

Peltier hot side cooling

i am trying to make a peltier powered mini fridge and i am having some trouble getting it to get to the temperatures i want. First of all, some info. I am using a Cooler Master T4 as the cooler for ...
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4answers
30k views

How do I wire a 12V DC fan to 120V AC source? [duplicate]

I am trying to install this miniature computer fan in a heated incubator that operates at 50 Celsuis 24/7 in order to encourage air flow throughout the box. Small fans like this run on 12 DCV power, ...
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2answers
2k views

How to slow down an 12V electromotor/fan

I just bought a cheapo fan like this on Ebay, and it's intended to be used in a costume for Halloween: http://www.ebay.com/itm/Computer-VGA-Video-Card-Heatsink-Cooler-Cooling-Transparent-Fan-40mm-12V-...
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1answer
4k views

Explanation of ceiling fan working principle [duplicate]

Can anyone explain how ceiling fan works; why the capacitor; how the fan rotates. Theory and practical. Single phase induction motor are very easy to understand. In this ceiling fan, the windings are ...
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3answers
1k views

Running a 12V 1.6A fan on a battery

I am building a portable A/C (really it's just a box with a fan and ice packs) and I want to use a 200CFM case fan. It's rated 12V 1.6A. I was hoping to direct connect this to a solar panel and keep ...
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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....
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2answers
188 views

How can i add cooling fan 12v in series or parallel with a 6v led diode

what resistor do i need for this circuit in parallel 12v dc 1000ma power supply connected in parallel: 1) 6v 800ma LED 2) 12V 90ma fan will i be good with a resistor of 22ohms before the 6v led? ...
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2answers
909 views

How can i add cooling fan in series or parallel with a led diode

I am new to this hobby and forum and would like to thank anyone for there help, I have found it quite easy to connect leds in series or parralel but now i need to add a fan to a small system to keep ...
0
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1answer
821 views

AC Fan Wiring without knowing connection

I am trying to work out how to wire up this A/C motor. There are three wires and one of the wires (Wire 1) has a marking (Z2). Two of the wires have terminals (wire 1 & 2) and the third wire has ...
0
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1answer
166 views

Can I run a fan from two power sources with differing voltage simultaneously? [closed]

EDIT For clarity please see the answer from Richard Crowley. Essentially I want to achieve his circuit with an automatic switch via a pre-set max temp. Really appreciate all the help so far. ...
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1answer
1k views

Can I have two regulator for wall fan - one default one and second I externally connect at switch board [closed]

I have bought one wall fan with following specification: Fan speed: 1900 RPM Voltage: 220-240 V Frequency: 50 Hz Power: 125 W It has inbuilt step type regulator with 3 stage button to either slower ...
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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 ...
2
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1answer
669 views

Possible reasons for DC fan failure

In my design I have a constant problem with failing 24VDC fans. The fans are used all across the machine, however they fail in only one position, so I excluded faulty fan model as a source of problem. ...
1
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1answer
924 views

Connecting a computer fan controller for multiple 12V DC fans to 120V AC

I would be interested to control multiple fans in an application that is outside a computer. I didn't find any interesting product for controlling multiple 12V 120mm fans that I could connect to 120V ...
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1answer
203 views

Effects of using a different PWM frequency than specified on device

I am wiring up a fan speed control circuit that creates a PWM frequency that is used by a PWM fan (the fan and its specs are pictured below). The fan claims that its PWM control is done through a ...
2
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1answer
2k views

Blower (Fan) Capacitor on Water Cooler

I've got a water cooler that has a centrifugal blower inside it. The blower fails to start most of the time, but I've verified that the motor works because it starts with a slight nudge. A slight ...
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2answers
2k views

How to power 12V fan and 3V LED with a 9V battery?

I am trying to power a 12V fan and a 3V LED with a 9V battery, but I do not know where to begin. I want the light to automatically be lit up when the 9V battery is connected to clip but the fan will ...
5
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1answer
499 views

Better approach for maximizing Cooling Fan Life Expectancy

We are working on a product which is extremely cost sensitive. It generates a lot of heat so we are planning to use a heat sink. For those 'very rare edge causes' where heat sink alone cannot cool ...
0
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1answer
141 views

DC fan current requirements

Very basic question here that I thought I knew the answer to until last night, but now I am very confused. I picked up some 12v DC squirrel cage fans for a chassis I am building. Here is the Mouser ...
3
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2answers
3k views

Small DC motor Heating up!

I am just trying to build a small fan to keep my Mac a little cooler from outside. So I have this little Box Design I made. Now, I'm a total noob at this thing so I need beginner level help here. I've ...
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1answer
779 views

Practical differences between putting circuit complexity on the ground side vs the hot side

I'm wiring some computer fans behind the fridge in my camper-van to help increase ventilation. As part of this circuit, I have a temperature controlling microcontroller plus relay and a series of SPDT ...
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4answers
10k views

What's needed to put a PC fan into reverse?

I've got a PC fan here (I've peeled off a sticker). And although this one doesn't come with the usual 3 or 4 wire connectors, it has enough electronics in it to only operate when power + is on red, ...
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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 ...
0
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1answer
399 views

Questions about a relay controlled AC fan setup

I need to switch an AC fan by a DAQ board's analog output. Here is the setup in my mind for the moment: The DAC of the data-acquisiton board can output 0 to 10V DC and can deliver max 5mA current. ...
0
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1answer
3k views

Is the PWM rail of a 4pin pwm Computer fan Positive or negative

I am wiring a 4 pin computer fan to a 12v dc power source and I am wondering the pin for the PWM is positive or negative.
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2answers
180 views

Regulate FAN voltage from another potentiometer (Different voltages)

Currently i have a 100w LED been powered from a 14.4V lipo battery. I use a Voltage Booster to boost voltage up to 33V. I have modified the voltage booster with a pararel potentiometer to change LED ...
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2answers
2k views

Can a single potentiometer be hooked up to multiple fans to control their speed?

I have recently learned about potentiometers and their "variable resistance" porperty. I am looking to hook up a Potentiometer in order to control 4 12VDC Fans. I am not sure if that is a good idea, ...
0
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1answer
2k views

Motor speed based on uF of capacitor

I have a single phase duct fan that that run by a capacitor and its running too fast. I don't need it at this speed. Motor: Single Phase Motor 78w @ ...
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3answers
1k views

Resistor or DC-DC converter?

I have 19.5VDC input voltage and a 12V fan to be operated. Should I use a resistor connected in series to adjust the voltage on the fan or a step-down DC-DC converter? The latter might be overkill but ...
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1answer
1k views

PWM with 12V DC fan on arduino [closed]

I am using an Arduino with PWM to control two 12V DC fans....however the fan works at 12V and Arduino at 5V, what kind of circuit do i need to allow this to function to work? I would imagine that ...
0
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2answers
793 views

Does this speed controller alter resistance or capacitance?

The attached image is of a ceiling fan speed controller module I brought online. It seems the attached circuit mainly consists of some capacitors. This makes me believe that the 4 different settings ...
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1answer
1k views

How to suppress voltage spikes caused by USB fan on ATX 5V rail?

I bought a cheap largish USB fan and plugged it in to the 5V rail on my adapted ATX bench power supply. Immediately, the ATMega328P that is present on the adapted ATX supply started to act erratically....
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1answer
601 views

Mosfet for switching a step-down for a 12V fan

I'm working on a circuit to control a 12V 4-pin PWM fan from an Arduino (that bit is working), and from a source of up to 42V. Turning the fan off is what I'm having a problem with. I know some 4-pin ...
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1answer
169 views

DC Fan using less than half of rated current. Looking to overvolt

I have a project involving a 200mm 12VDC PC cooling fan (FS-200RB) that will be used for cooling me - not a computer. The fan is labeled: 12V DC / 0.42A / 5.04W ...
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2answers
5k views

Can you safely use a lower voltage on a DC motor?

I have some pepper seedlings I'm starting indoors and I'd like to set up an oscillating fan for ventilation. I found an old one in my garage meant to plug into the cigarette lighter of a car. It's ...
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3answers
121 views

Enough power for 4 12V 0.95A fans at the same time [duplicate]

I am currently using 1 12V 0.95A fan to circulate air in my humidor (coolerator) and using an AC adapter rated class 2 120V 60/60 with an output of 9V 300mA. Can I add 3 more fans with the same power ...
6
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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 ...
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3answers
396 views

115VAC Fan fail circuit [closed]

how do I design a fan fail circuit (open circuit or fan not moving etc) for a 115VAC two wire fan and illuminate a 115V Panel indicator?
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2answers
8k views

Can a PWM fan be turned on and off with the control pin voltage?

Can a PWM fan be turned on and off through the control pin? Or can it only adjust speed? Is it just a fet that turns the 12V on and off?
4
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4answers
5k views

How can I adapt a 3-pin PC fan connector to a 4-pin connector?

My computer's motherboard uses all four pin fan connectors with no support for speed controlling the older three pin fan connector. The problem is, all the PC fans that I have use a three pin ...