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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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Shelly 0-10 with östberg ø125 c1 EC fan [closed]

Can one use a shelly to regulate det voltage of an EC fan of this size? Östberg has advertised the use of a plejd dimmer for this, but I want to use shelly if it is safe. I don't know enough about ...
Markus Herland's user avatar
1 vote
1 answer
27 views

Wiring a new fan motor to my home air conditioner

My original house A/C fan (condenser) motor stopped working. It was an F48SJ6MA6. They're no longer made. I purchased an OCB1026A. They come with different combinations of wires. The original motor ...
JBH's user avatar
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0 votes
3 answers
73 views

Grounding issue with PWM fan controller on Raspberry Pi Pico to drive 12 VDC fan

I'm trying to build a PWM fan controller for an industrial Noctua PWM Fan (NF-F12 IndustrialPPC 3000 PWM). You'll find the schematic below. The fan is powered by a 12 VDC power supply (...
Leandros's user avatar
  • 103
1 vote
2 answers
50 views

Potentiometer for Kitchen Fan

I'm exploring the possibility of building a potentiometer for my rangehood fan. The manufacturer (FanTech) of the fan actually sells one (EC-10VHL) but I'm having a hard time trying to find a ...
vince chung's user avatar
2 votes
1 answer
312 views

4-pin 12 V PC fan - manual speed control

I've been reading a little about 4-pin PC fans, but haven't been able to find a clear answer. I understand the PWM pin controls the fan's running speed, so if I wanted to use a 4-pin fan for a non-PC ...
MyFingerHertz's user avatar
0 votes
1 answer
45 views

How measure fan signal that not seems to the ground isolated?

I have voltronic inverter 3k fan stops with code 01 its mean fan need a replacement old fan in pic-01 its use us62 ic so i order new fan pic-02 and its not working first reason the cables reversed ...
Waled Osama's user avatar
1 vote
1 answer
63 views

Why fan motor doesn't spin freely after power is applied? [closed]

My Breville toaster oven convection fan stopped working. I took it apart to access the motor and it spins perfectly with no power. Zero resistance, silent, and takes a good 10 seconds to slow to a ...
MilkyTech's user avatar
  • 111
0 votes
1 answer
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DC LED flickering - connected to Solar Panel (DC) with fan (DC)

I have set up a 100% DC system for my house; solar panel (400 W, 10 A, 40 V) and the circuit connects to two LED fans in series (DC - 12 V) and radiator fan (DC - 24 V). I'm an arts student and self-...
noobie electric's user avatar
0 votes
0 answers
41 views

Wiring Portable AC to Run at Max

I'd like to wire this portable AC to always run at max (compressor on and fan at max speed). I'm using it for a project where the temperature is going to be controlled by controlling the power to to ...
KingLouis_CLXXII's user avatar
1 vote
1 answer
48 views

Speed control fan with PWM and capacitor (no pwm fan)

For my project I want to control the speed of a regular non-PWM fan. I was wondering if what I came out with is a good idea or not. I noticed that the capacitor I used (25V 47µF) gets a bit warm after ...
DeltaLima's user avatar
0 votes
0 answers
34 views

ESP32 getting brownout!

I have designed a fan controller circuit using esp32. The circuit was working when I connected with a bulb. When I connected with a fan the chip is getting turned on and immediately it turns off. This ...
Aakas Pulikkal's user avatar
0 votes
0 answers
25 views

Fan controller using ESP32

I have designed a fan controller using ESP32. It was working fine initially when we checked by giving the bulb as load. After that we connected it to a fan, and then it started brownout during the ...
Aakas Pulikkal's user avatar
0 votes
0 answers
28 views

What are the relevant specs for a BLDC fan controller?

I have a ceiling fan with a fried remote receiver / controller that I need to replace. Oddly enough, the only specs I am able to discern are power limit (original says 38W, I can find plenty of ...
Oliver Graeser's user avatar
3 votes
1 answer
328 views

Transistor won't fully turn off when Fan PWM is connected

I'm trying to use a RP2040-zero to control a 12V PC fan that also has a PWM and tach connection. I'm using a transistor to turn off the fan completely as a 0% duty cycle on PWM doesn't turn the fan ...
mpaw's user avatar
  • 133
3 votes
5 answers
2k views

What is this 4-pin fan header?

What is the name of this 4-pin fan header, in the first image? This is from an Intel NUC motherboard, and there is 1.0mm between each pin. Will I be able to get and use an adapter for the much more ...
Fred Nurk's user avatar
  • 133
0 votes
0 answers
35 views

How to control a USB powered fan from ESP8266 or Raspberry PI

I bought a USB powered desktop mini fan which has a single button to control the fan speed (1, 2, 3, Off). The fan has a rated input of 5V/1Amp and rated power of 1 - 5W. I am tyring to find out a way ...
debopam's user avatar
1 vote
1 answer
44 views

Pedestal fan motor enquiry

Can I use a 24 V Nidec motor on a 12 V supply DC fan? It's a Nidec brushless motor model 48F704R090 supposedly at 12 V. I suppose current will be halved?
William Tan's user avatar
0 votes
1 answer
69 views

RC filter to DC 12V, 3A fan PWM

This feels like a question asked hundreds of times before, yet doesn't seem to have a good solution. If a company could sell me a solution, I would buy it in a heartbeat. I have a van with a 3A 12VDC ...
Riprock99's user avatar
0 votes
2 answers
91 views

Do 12V fans for cooling a chassis commonly need external flyback diodes?

I'm building an electronics controller. I have a chassis with a 12VDC cooling fan. It seems to me that a fan might present an inductive load to the ACDC power supply it's connected to, so I'm trying ...
Open_Hamster3337's user avatar
6 votes
3 answers
1k views

Cooling fan direction

I am building a temperature controller. The controller is built in a metal rack mount chassis. The components inside the controller generally consist of ACDC power supplies, an arduino and small ...
Open_Hamster3337's user avatar
0 votes
1 answer
40 views

Connecting a digital tachometer (RPM-meter) to an EC-fan

I have an EC-ventilator with 4 output contacts: +10 V 0-10 V GND TACH (2 pulses per revolution) The first three contacts are for speed control with a 10 kΩ potentiometer. I have succesfully ...
user675169's user avatar
1 vote
1 answer
68 views

Is it possible to control speed of a 3 pin PC liquid cooling pump with one winding using PWM?

Back story: I have liquid cooled PC where I can’t control fans and pump from motherboard headers (thanks HP). I decided to use DC/DC converters to power fans and pump. It is working, but since pump ...
lekto's user avatar
  • 41
0 votes
0 answers
96 views

Need help with PTC heater EDITED

simulate this circuit – Schematic created using CircuitLab Figure 1. CircuitLab schematic by @Transistor for OP to edit. I have built a heater from a PTC heater with a couple of fans on top and ...
makkkis's user avatar
0 votes
1 answer
74 views

25x10mm 5V fan is too loud

I'm using a 25x10mm fan (Sunon MF25100V1-1000U-A99) - I was using a different fan from the same manufacturer (Sunon MC25060V2-000U-A99) and just plugging it right 5V/GND and it worked fine. ...
vicatcu's user avatar
  • 22.8k
0 votes
0 answers
105 views

Will Undervoltage Damage A Brushless Fan?

I have an off-grid solar panel set up ready and it works really well. My solar PWM charge controller of the back side aluminum heat sink is too hot to touch when its during sunlight. I was thinking ...
Kokachi's user avatar
  • 690
0 votes
0 answers
39 views

4 wire PWM 4 stage controller

hope I got an idea to build this idea I had. I want to build a 4 stage pwm fan controller, like 25%, 50%, 75% and 100% duty cicle. I guess it could be done doing it with cmos 4017 with a pulser switch ...
Edgar Mauricio Diaz Orellana's user avatar
0 votes
0 answers
67 views

Turning on a fan through a relay power-cycles a Raspberry Pi Pico

I'm trying to control a fan 1 using a Raspberry Pi Pico and a relay 2. The relay is connected to the Pico on pin 19 (GP14) for signal, to GND, and to 3V3. The Pico is powered and controlled through ...
Johannes Bauer's user avatar
1 vote
0 answers
313 views

STM32 24VDC PWM fan speed control with optocoupler

I am using this circuit to control a 24V fan at a frequency of 31kHz (MCU - 72 MHz, Prescaler - 9, Counter period - 255): The scheme works. But I want to add an optocoupler to the circuit, I did it ...
Sem's user avatar
  • 11
0 votes
1 answer
51 views

Power 3 fans from 2 AC sources without mixing the sources

I have 2 IoT enabled sockets with each socket connected to a single load. All of there components are present in a single large enclosure. To combat the heat generated from the loads, I added some ...
404_Sleep_Not_Found's user avatar
2 votes
1 answer
370 views

Name of this 4-pin fan connector

I have a 40mm fan with a connector that has standard breadboard pin spacing. I would like to connect it to what I thought was a relatively standard fan connector that has wider spacing (and thicker ...
larsks's user avatar
  • 354
0 votes
0 answers
213 views

Reduce noise coming from DC brushless fan

First of all, I'm an amateur when it comes to electronics so thanks for your patience! I have added a fan on a sound processor which tends to overheat but then I discovered I can hear the fan on the ...
Antonio Marcheselli's user avatar
1 vote
1 answer
320 views

A simple solution to the PWM controlled DC fan?

I am trying to temperature control a set of 12V DC fans (2 wires) of mine. I went down the pwm microcontroller output + mofset rabbit hole (increases the noise / can damage the fans), read about RC ...
sousben's user avatar
  • 111
0 votes
2 answers
49 views

Fans with presumably same cooling performance but significantly different current

I am looking to replace a fan in laptop. I got two candidates for a replacement. Both of them have the same Lenovo FRU number (Field Replacement Unit). From what I understand items with the same FRU ...
Andy's user avatar
  • 105
2 votes
1 answer
352 views

What is the proper name of this fan connector?

Does anybody know what the correct name for this fan connector is? The female plug side is "Molex KK 254 Housing with Polarization Rib, 4 pin" https://molex.com/en-us/products/part-detail/...
Alex Moore's user avatar
0 votes
0 answers
70 views

Is power low for a high speed fan?

Got a question for my lab telling that the power consumed is low at higher speeds, why is it so? couldn't find any source backing up this statement too I did find this graph of torque vs speed, so I ...
Adil Mohammed's user avatar
0 votes
1 answer
97 views

How to run fans out of phase?

I am working with server fans. The noise generated by these fans is quite disruptive, and I've read that running them 180 degrees out of phase could potentially reduce the noise. I'm looking for ...
sri harsha electronics guthiko's user avatar
0 votes
2 answers
119 views

I need to find a part for my PCB

I have a PCB that I only have one component left to fit on the board, but I do not know what it is or how to get that. It say 3/8 on the part but haven't found anything like that. The plan is from ...
mullcom's user avatar
  • 11
2 votes
1 answer
71 views

High frequency sound on a PWM fan for some specific duty settings

So I got a used fan (specifically a Sanyo Denki 9s1212 series) and I discovered that under most duty settings (practically when not 100% or 0%) the fan emits a high frequency sound like this: (mind ...
usb_naming_is_confusing's user avatar
0 votes
3 answers
1k views

Implementing a 5 Watt, Linear Variable DC Power Supply that DOESN'T get burning hot?

The load I am trying to drive is a fan module that includes a DC cooling fan, a tachometer, some status LEDs and other temperature monitoring electronics. Historically users have swapped power ...
esologic's user avatar
  • 131
4 votes
3 answers
385 views

Using a Zener diode and transistor to reduce high pitch fan noise

I am working on a simple setup for a 5V DC computer fan, powered by two small solar panels. This fan will only start spinning around\above 2.3V. Anything below this value will just produce an annoying ...
Mosman's user avatar
  • 41
0 votes
0 answers
227 views

PWM is not controlling the fan, voltage drops | ESP32 4-pin fan driver

I'm know only a little about electronics but I had a try to create a driver for 2 120 mm fans (3 W*2). I have PNP, NPN BJTs and N-channel MOSFET IRF3205 which requires 4 V at the gate to be triggered. ...
Cranwell's user avatar
0 votes
1 answer
59 views

Are there drawbacks to connecting a remote diode temperature sensor through a connector and cable interface?

I would like to connect an external temperature sensor (external to the PCB) to a the DP/DN pins of an EMC2103 fan controller. My plan would be to use a twisted pair cable with a generic TO-92 remote ...
mouelle's user avatar
  • 78
0 votes
2 answers
162 views

Touch button bypass on fan with smart inching switch [closed]

How can I bypass the touch button on fan Sencor SFE 2340WH? I want to of/off fan with smart momentary switch. Below is componets maybe with reading errors. Components: TR1-TR5: HSDQ / BT134-800 / ...
Danster's user avatar
1 vote
0 answers
149 views

Hardware based PWM fan solutions

HPE DL360P’s love to run these fans (8x of them) at max speed. I don’t really need them all running, but wasn’t sure if dummy plugs to just trick the motherboard was a good idea. Wiring length and ...
LunarLaurus's user avatar
1 vote
1 answer
90 views

Looking for a circuit to run a 12 V toilet exhaust fan when utility power fails

I have a tiny house. Recently my inverter failed and it could take weeks or months to have it fixed. It's a 48 V DC solar to 240 V AC, that is intermittently working with a non-working 5 kWh battery. ...
LeoTehJester's user avatar
0 votes
0 answers
100 views

What type of single-phase motors can I control using a frequency inverter?

I have a single phase fan, and I want to control the speed of this fan so it occurred to me to design a VFD for this purpose, but I was researching more about single phase AC motors and I read that ...
WalterPH's user avatar
  • 440
2 votes
1 answer
58 views

Ventilation system level 2/3 not working anymore (circuit analysis)

A house ventilation system has the following circuit: The following three switches enable three levels of fan speed: Level 1 is always running, level 2 is intermediate and level 3 is full power. ...
Radio Controlled's user avatar
0 votes
2 answers
96 views

Limiting a 24VDC fan's draw to 1ampere

I have a 24 VDC fan that is rated for 3 A draw at maximum speed. I want to limit it to only using 1 A at 24 VDC. The device I'm building uses a 5 A 24 VDC power supply (already bought them) and I only ...
Aaron's user avatar
  • 1
8 votes
2 answers
1k views

Fan at full speed on PC - Is there anything I can do to slow it down? [closed]

The internal sensor for the motherboard is giving out an invalid value for the temperature, causing the fan to go on full. The computer is exactly 10 days out of warranty. It's a 4 Pin 12v PWM fan. Is ...
JohnnyVegas's user avatar
0 votes
1 answer
155 views

Can I solder two 12 VDC fans to one end of wires of single Molex connector?

I have 2 Sunon fans (12 V, 415/519 mA - max, 5.4 W/6.22 W - max). I want to solder both onto the end of a single Molex connector cable extension (bought from a local store). Molex connectors all-4 ...
beginner2's user avatar

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