Questions tagged [fan]

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

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Fan voltage - sticker vs specifications

I am looking to replace the fan in my Marlec Solar iBoost as it is extremely noisy and causes insidious vibrations in the wall. On the fan, the label shows as follows: Model: AV-F4020LB DC 5V I ...
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Wiring up a ceiling fan [migrated]

I have a Mitsubishi ceiling fan of this type: The given wiring diagram (pasted inside the cover of the remote switch box) is as follows: This is a 230V region, and the usual wiring color code is ...
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Why can I use an AC power supply to spin DC PC-fans?

This question might seem a bit alarming and it did come up because of an inadvertency on my part. I tried to reuse old PC fans for cooling and grabbed an old phone power supply that wasn't being used ...
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2-pin fan connector identification

I can't find exactly this connector. It is from a small fan of a Lecroy Xs scope. The pitch is 0.05 inch. Does anyone happen to know who the manufacturer is, or what type this is?
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Can I use a light bulb dimmer to control an AC axial fan? [closed]

I have multiple AC axial fan that I need to slow down. Model number is ACI4420HH from ebm-papst. https://www.ebmpapst.com/de/en/products/compact-fans/axial-compact-fans/p/ACI4420HH.html They run on ...
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Digitally adjusting AC voltage for a motor

Basically I have an extraction fan motor that runs full speed at 230V, at 130V it runs around half the speed. The original chip allows switching between few voltages (and therefore, fan speeds) upon ...
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Does anyone recognize such connectors?

These are the connectors used to power a 12V fan. I have both male and female ends attached. Does anyone know the name of it? I'd like to purchase a extension cable. It has 8 pins because there are ...
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12V on 24V PSU with Buck and Resistor

I have a 0.08A 12V fan that I'd like to run on a 24V PSU. I have a 1/4W resistor kit with several different resistor values and a max input 23V buck converter. Can I add a resistor in series before ...
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White insulating sheets inside power supply

Does anyone know what this kind of sheet is called? I presume the purpose is for electrical insulation. The one in the picture is found on a fan inside a power supply.
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Can someone confirm the typical application circuit of MAX664x Fan controller datasheet?

I'm planning to use the MAX 6644 for a simple fan control application. All in all the IC is very straight forward to use. However after analyzing the typical application circuits in the datasheet I ...
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Different types of ceiling fan speed controllers

I have a new Hunter ceiling fan that came with a 4 speed wireless controller built in, including a 5uf capacitor and a 10uf capacitor inside. I removed the wireless controller and wired the motor ...
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Multimeter shows voltage on metal cage of my new Standing Fan! [closed]

A few days ago I bought an electrical fan, with 5x aluminum blades. After I installed and put it to work, I noticed, using a simple indicator screwdriver, that the metal cage/fence was in contact with ...
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How does my fan have active tacho (RPM) output even though the blades aren't turning?

Whilst working on a project to control and monitor an EC fan from a Raspberry Pi, I have encountered an anomaly that has me completely confused; the fan is still outputting pulses on the tacho line ...
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How doest this PSC multi-speed motor circuit work?

I've been replacing the thermal fuse of my fan blower each time it trips (every year or so, when the oils degrades). But this year I decided to look at how the motor works. It has 3 speeds (slow, ...
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Calculating AC Unit Watts

I'm trying to calculate the watts used from my AC unit. Below I am including my sticker label that's on the AC Unit along with a electrical data sheet I found online for my model. So far this is ...
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How to determine the number of windings needed for a ceiling fan rotor?

I have picked up from the trash, three oldish ceiling fans. They do not run on electronics. Upon opening the rotor, I can see two coils; one outer and one inner. They look real dirty and I would like ...
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How to calculate torque constant and back EMF constant of a BLDC motor?

I have a BLDC motor to run for a fan. The parameters are as follows: Electrical frequency measured: 61.936 Hz Pole pairs: 8 Line voltage measured: 70.365 V RMS Line voltage peak: 99.51113732 ...
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Can the polarity of a 12V brushless CPU fan be reversed?

Can the polarity of standard CPU 12VDC brushless fan be reversed? For my application it is fine if the an is not broken afterwards. Please see the image of the an below:
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2 answers
673 views

What is the purpose of the capacitor and diode in this fan driver circuit?

I have an FPGA dev board with a fan PWM circuit so that you can hook it up to a fan + heatsink. I happen to like this as we put a common heatsink together for the hottest components, and I drive it ...
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What kind of wire terminator is this for computer power supply fan?

Trying to determine the style of wire-terminator used here so I can buy a few. What is this called? It's on the wires for a three-wire fan used in a desktop's power supply.
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Why does a 12V, 0.5 amp fan work in a PSU but a 12V, 0.125A does not? (Both are three wire fans)

Completely new to electronics and I'm learning by trying to replace a bad PSU fan (bad bearing but no power problems to the fan). The original fan was 12V, 0.5A. I bought a rinky dink fan that was too ...
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3 answers
334 views

Is it OK to reduce fan speed by reducing voltage?

I have this air cooler whose speed is just too much even on the lowest speed setting, so I added one more speed controller(or regulator) in series which is basically used to control the ceiling fan ...
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2 answers
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Need to power an AC Motor from either 120VAC or 220VAC

I am trying to modify a convection oven into a solder re-flow oven. One of my design requirements is it needs to work on both 120VAC and 220VAC (I will need to use it in the USA and over seas). ...
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2 votes
3 answers
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Identification of a Lenovo W530 fan connector type

I have been trying to identify the black connector in the picture. It is from an older Lenovo W530 laptop fan made by Delta. Unfortunately it appears Delta doesn't have a data sheet (I asked them) and ...
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1 answer
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How do you calculate total current draw in parallel?

If I have a 12V power supply, a 6A TEC, and a 0.15A fan running in parallel, how do I calculate total current draw?
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2 answers
447 views

No resistor to limit base current in this BJT application?

A manual fan controller in my PC just 'sploded: fair enough, it was about 10 years old, and driving more fans than appropriate. I got around to fix it, and figured I needed to change the BJT, because ...
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Single Phase Hall Effect Fan Driver - how to use this part?

During the search for some sensor, I stumbled over the following part (MA477M) and I was wondering how exactly it would be used. It is called "Single Phase Hall Effect Fan Driver". How would ...
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How to increase load current for capacitive AC voltage regulator circuit?

I am studying fans and their working while visiting a factory, and I came across one problem that they're trying to solve. For an AC capacitive voltage regulator, how can we increase the amount of ...
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2 answers
178 views

Does a 220V AC fan emit much more EMI noise than a 24V DC fan?

I've been discussing this with other colleagues for some time now and we can't reach a conclusion. Also searched on internet but didn't find a good article or proof that in fact a 220V AC fan will ...
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First attempt at a circuit design for Raspberry Pi

The last time I did any electronic design myself was about 12 years ago, I'm hoping to turn this schematic into a PCB and solder it all up eventually but I am so out of my depth trying to relearn this ...
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How do you interpret LTSpice graphs?

I've created a circuit in LTSpice to model a fan assembly I'm looking to build. In the below circuit the current sources represent the fan and the voltage sources represent the voltage source I'll be ...
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8 votes
4 answers
825 views

Is it normal that a 12 V DC motor changes its RPM depending on its orientation?

I got a 40mm brushless DC fan from SHENGSHIDA which is rated at 12V and 0.15A. I supply it with 5V from a Raspberry Pi. I noticed that the rotational speed of the rotor changes depending on the ...
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TEG (seebeck) to drive small brushless motor?

is it possible to drive a small (~ 24x30mm) brushless motor with a small (40x40m, ~0-3V) TEG module? I am trying to educate myself on brushless motor function and control but can't find much info on ...
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1 vote
2 answers
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Will mounting the hub of a fan directly above a heatsink have a big impact on thermal performance?

The 6 SMD MOSFETs in the center generate a total heat of about 80w. I was planning on using this heatsink (ATS-1106-C1-R0) with this fan (08025SS-24Q-AT-D0) mounted directly above it. Looking at the ...
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Help identifying 4-pin PWM fan connector

Does anybody know the name/type of the connector shown below? Context: it is 4-pin PWM fan connector for the fan of an Nvidia RTX A6000. Dimensions: 5mm x 1mm x 4mm, 1mm pitch === Edit === Thanks to @...
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How to increase the fan speed connected to a usb port

I have 6 PC fans 12V 0.12A connected in parallel. They are connected with a usb cable to a mobile charger. When I was connecting them to the motherboard they were much faster than now though the ...
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3 answers
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Can I reduce AC current to vent from from 3A to 2A?

I have a range/stove hood with a really strong and loud blower motor. It's so strong that when we moved into our small house, the inspector made me disable the highest 3 speeds/CFM fan levels (600CFM) ...
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6 answers
1k views

Are anodized fan filters efficient at blocking EMI?

I was looking for metallic fan grills to close a large fan aperture for EMC and found many had a non-conductive finish, e.g. this one claims to have an anodized finish. Doesn't that make them ...
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2 votes
1 answer
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Where to place a cooling fan supply capacitor

I want to run a ~2W, 12 VDC fan in an EMI-sensitive environment. The schematic is shown below. Due to the spiky current draw, I intend to place C1 and C2 right by the fan connector, so high frequency ...
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Power supply rated for "140 watts with natural convection" - Does it need a fan?

In the data sheet for my CUI VOF-225C power supply, under mechanical, it is mentioned that : cooling - natural convection (no integrated fan) Does this mean I do not need to run a fan with my power ...
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How to control a laptop CPU fan? [duplicate]

I have a spare laptop fan but I have no idea how to control (or even power) it. It has Red, Yellow, Blue and Black wires. I assumed red is +5V and black is your normal ground, but after applying 5v it ...
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1 vote
1 answer
107 views

Can I reverse the direction of a PSC fan motor? [closed]

Hello I have a fan that utilizes a Kulthorn Electric KDE3F4709 fan motor. When I google the item I originally purchased had it listed as "2-speed heavy duty thermally protected 120-Volt, 60 Hz, ...
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3-wire fan: Minimum supply voltage for Tach signal?

I want to use a 3-wire fan (e.g. this one), which will be operated closed-loop, powered by a variable DC voltage 0-12 V with tachometer feedback. When requesting a rather low RPM of the fan, the DC ...
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2 votes
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Fans in series vs parallel

I have a 3d printer with a 24 volt PSU. I am looking to upgrade a pair of fans on the printer, and there is a much larger availability of 12v fans then there are 24v fans. There are 2 common ...
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4 answers
215 views

LDO with PWM as VCC

I have a 5V fan that needs to be controlled by a 12V PWM output (the PWM is there to control the fan's RPM). Can I use an LDO to step down the 12V PWM to 5V? I'd connect the 12V PWM as the voltage ...
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1 answer
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How to use the "Function type" fans

I have these AFB0824GHE-R00 Fans in my hands, and I see that there are three wires on that fan. The + and -, and the third blue wire, which according to the datasheet's hint is a function wire? I am ...
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-1 votes
2 answers
169 views

Fan switching circuit, which is better? [closed]

Beginner electronics hobbyist here. I was browsing through some test questions on circuit design and came across this one which asks which fan switching circuit is better, and why. I'm leaning ...
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271 views

Fan speed control using three relays

I'm trying to control the speed of a 12V(0.14A max current) fan using three relays. It should have four states which are turned off, low speed, medium speed and high speed. What's the correct wiring ...
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Removing broken switch from mains extraction fan for project - how to work out what the colored wires are

I have a kitchen extractor fan that I need for a scale model of Corsi-Rosenthal cube/box. The switch no longer works. It used to have a couple of speeds and a lamp. I'm looking to just wire it ...
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Can a fuse (non-resettable) wear out over time?

If a given circuit (containing a fuse) operates perfectly and continuously, will there come a time when the fuse simply stops working due to age and wear (wear from passively passing current ...
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