Questions tagged [fan]

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

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18 views

Getting loud whine on dual 12v 80 watt DC Universal radiator fans, especially in reverse

In an effort to create airflow in my studio that has the only window facing a sealed alley, I swapped the AC fans from the useless Holmes dual window fan and replaced them with two 10-inch 12V DC 80-...
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35 views

Wiring Case fans in Parallel to a usb cable with an inline switch, still spins slow

I have 2 separate projects one is a case for a raspberry pi 3b+ as NAS server and the other is a media cabinet. The NAS kit i have 4 30mm 2-wire fans (5V 180mA) and a wired in usb cable that is ...
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67 views

Why does this AC axial cooling fan have 3 wires?

I'm restoring a 1970s HP Frequency Counter and went to replace the 110V AC tube axial cooling fan on the unit to discover that it has 3 wires. The original fan is a ROTRON 1 PH CAP 0.25MFD fan. I'm a ...
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52 views

Controlling a shaded pole fan via light dimmer switch? Which among these two fans are better for cooling?

I'm building a DIY lab round flask heater using a fiber glass 250mL GLAS-COL M102, 180 Watts heater mantle. The temperature will be controlled via a PID controller and a K-type thermocouple. Since the ...
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2answers
35 views

5VDC Fan Circuit

I have a 5VDC fan (AUB0505HD), and my ultimate goal is to drive this fan using a 3.3V PWM signal from a Raspberry Pi Zero. I haven't worked with transistors much outside of EE school, so I don't ...
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49 views

Furnace operated ceiling fan

I was thinking of having a ceiling fan come on when my furnace came on. I used to dabble in electronics but it's been a long while and I know there are new and innovative approaches to accomplish the ...
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1answer
33 views

Driving fan 4 pin with low frequency PWM

I currently using a 4pin fan in my project. I need to drive the fan with a 120 Hz PWM signal. I read in all the documentation of the fan that the suitable PWM frequency is from 21 to 28 kHz. I ...
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1answer
91 views

Fan is causing noise in the circuit

I'm in the process building a linear lab PSU, the fan which is supposed to cool the heatsink is causing 6 mV peak to peak noise at the output of PSU. It's a 4x4 cm brushless chinese fan with unknown ...
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62 views

AC Dimmer circuit with MOC3021 & EL817 along with ESP8266 (NodeMCU)

Major two issues/question are here: 1) The challenge I am facing is, my interrupt is not working. 2) do I need to include a Heat Sink in this? Hello, I am quite ...
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3answers
68 views

Can I somehow control a PSU-powered fan using a 4-pin fan output on the motherboard? [duplicate]

I have a 12V 29.4W 3-wire Delta Electronics fan that I want to power using an EVGA 750 G3 PSU and control via one of the 4-pin fan terminals on an MSI MSI Z390-A PRO ATX LGA1151 motherboard. Not ...
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110 views

What is a good (cheap) way to slow down a fan with a thermistor?

What is a good (cheap) practice to manage a fan with a thermistor? Here is what I think to do: simulate this circuit – Schematic created using CircuitLab This should work as temperature ...
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75 views

How to slow down 240V AC bathroom fan

I have a small toilet fan which is quite noisy and far too powerful for what we need. I'm looking for a solution where I could reduce AC 240V to AC 110-150V with minimum amount of components. Any ...
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51 views

DC Fan Malfunction Indicator

How can I make a simple circuit to trigger a buzzer for a 3-pin 12v DC fan when its stops working using the fan Sense/TACH/Yellow wire?
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1answer
80 views

Using 2 5V pins to get 10V [duplicate]

I want to to my RaspBerry Pi 4 with an old small CPU fan. However it's a 12V fan. Is it possible to use 2 of the 5V pins on the board to total to 10V? Sorry if this is a dumb question. I haven't ...
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24 views

PWM about 4pin Fan

I use a Fan with 4 pins which are 12V, GND, PWM, FG and my circuit it FAN's PWM pin is connected ,through 100R series resistor, to MCU's PWM pin. today I check the Fan PWM without MCU.(only test for ...
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189 views

Controlling the speed of a single speed AC exhaust fan motor

I have this single speed exhaust fan: 30" Exhaust Fan with Shutter - Direct Drive - 1/4 HP - Single Speed. When it's running it's way faster and louder than I'd like it to be. So I'm trying figure ...
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102 views

“One way” level shifter for PWM 4PIN fan control

I'd like to make a 4 pin pwm fan control using 3v3 uC. Fan is 12v powered and I have a 12v to 3v3 converter to power uC (VCC gate is 3v3 uC power). I want to isolate 3v3 VCC and 12v as much as ...
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91 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 ...
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26 views

connect 5v fan from voltage regulator

i have a 12v power supply and fan 5v 150mA and voltage regulator L7805 cv to reduce the voltage to 5volt . i need a circuit to just turn the fan on /off by switch . can i connect the fan directly to ...
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48 views

12v Fan Control with 3v3 uC

I need to control 12v Fan with 3v3 uC. I need to stop and start it using uC gpio pins. I tried to use this schematic first: But when I set uC gpio (14 in my case) to 0, fan starts to make a weird ...
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49 views

Replacing 5-Wire Fan Capacitor with a Capacitor of Different Capacitance

I have an old 3 speed ceiling fan that pretty much doesn't spin. It doesn't start by itself (if I start it by hand it will keep on spinning, but slowly). Some of the speeds don't work at all, even ...
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1answer
67 views

Is it possible to control a PWM computer fan with a resistor? If yes, how? [closed]

I have a video card that is loud while idle, because the fan curve appears to be set rather aggressively. Unfortunately, this can not be changed via software. The fan is connected with a regular 4-...
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2answers
311 views

Controlling DC fan with Mosfet PWM

I am trying to control a 12V DC fan with PWM using an IRFZ44N MOSFET. However somehow the fan is not turning on and off when the gate is pulled to either 0V or 5V (on the power supply). And it is ...
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1answer
37 views

noise/rpm/cpm values of 12V fan on 5V voltage

I am using Sunon HA40101V4-1000U-A99. This is 12V DC fan, but I am using it with 5V DC (according to specification). But I am not able to find values for audible noise, rpm, cpm, current on 5V. ...
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102 views

CPU fan connected to solar panel will run but wont start

I'm trying to run a 12V 0.09A CPU fan directly off a 5W solar panel (not ideal, I know). The panel runs the fan fine, even in morning and evening sun. However, the fan will not restart without a push ...
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111 views

12 V PWM fan and Wemos D1 Mini - ground loop?

Newbie here. I'm trying to power a 12 V 4-wire fan and a Wemos D1 Mini from the same power source. The aim is to use a Dallas DS18B20 temp sensor and increase/decrease the fan speed as per the temp ...
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58 views

How do i control the speed of exhaust fan as the same way of controlling household fan? [duplicate]

I want to control the speed of this exhaust fan the same way household fan speed regulator works (The speed is discrete, using 0,1,2,3 button. the higher the button the faster fan spin) how do i do ...
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2answers
2k views

5V 4-pin Noctua A4X10 on Raspberry Pi

I want to connect a NOCTUA NF-A4X10 5V PWM 4-pin fan to a Raspberry Pi 3B. The below is the circuit I'm planning to use. (EDIT: Flyback diode (such as a 1N4001) is not needed since Noctua already ...
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45 views

Nidec gamma32 4pin pinout

I have Nidec Gamma32 D12F-24BS4 15BH2 blowing fan cooler. It has very strange coloring for wires: red-white-black-yellow. Probably two of wires are GND and +24v ...
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68 views

Female 4 pin fan header

While male 4 pin fan headers are plentiful (e.g., here), I can't find a female version of it. I see lots of them on fan extension cables, but none that can be soldered to a PCB. Does anyone know a ...
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162 views

Can I run 24 V DC fan with on 18 V DC? [closed]

I have got a coffee machine which had its cooling fan died. The current fan is 18 V DC but the only replacement fans I can find are 24 V DC. Will that be a issue ? Thanks.
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106 views

Replacing Projector Fan - Wiring Color

An old Sony VPL-CX11 stopped working because one of the fans (the lamp's one) was so rusty that couldn't rotate. In the front of the projector there are two fans, one for the lamp and the other for ...
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1answer
27 views

12V Pump not working

I have interfaced a 12 V pump and a 12 V fan to LPC2138, there are 3 5 V sensors interfaced, according to which the fan and pump function. The whole setup is in PCB. There is a ESP8266 module ...
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66 views

Powering 5 fans with a LTC 3780 : should I protect it against induction effect?

I want to power 5 fans in parallel (12V 0.80A, each) using a adjustable power supply (DIY, made with an LTC 3780 connected to a 24V 15A PSU and mini Voltmetre). I read that a fan could destroy the ...
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1answer
117 views

PWM fan with PWM wire disconnected [closed]

What will happen when the supply and ground are connected for a CPU fan with PWM but the PWM wire is not connected? Will the fan run at its full speed?
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1answer
41 views

USB internal control to on/off a pc fan molex circuit

I am new to electronic circuits so I might not have the correct nomenclature for some items. Description: I have 3 high power 12V PC fans (NON PWM) connected to a hub that draw power from MOLEX ...
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1answer
57 views

Will it harm a PWM fan controller to be backfed full fan voltage?

I want to install a PWM controller to a small 12 volt furnace fan in a camper. I want the fan to run slowly after furnace shutdown, to quietly stir the air for more even heating. My thought is to ...
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1answer
37 views

Help understanding amperage of DC motor and heat generation

I am diagnosing an issue in an automotive HVAC system and have been testing the blower motor. I would expect somewhere approximately 8A to 15A of current draw. I have test wired the motor with 14AWG ...
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1answer
217 views

How can I check the voltage of a fan?

Is there a way I can connect 1 or 2 batteries to a CPU Fan that I dissasembled to check what voltage it is so I can use it at the highest speed?
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57 views

Trouble to find out the nominal motor current and motor type of a fan from its datasheet

Is there a way to find out what is the nominal current of this fan and what type of single phase induction motor is used?
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1answer
151 views

How to power a dc fan (4wire) [closed]

I have intel dc 12v cpu fan (removed from a computer) that has 4 wires (Black Yellow Green Blue) (Model E97379) [Photo- http://www.filetolink.com/c50ea25682 ] I want to power it by ac to dc 12v ...
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1answer
65 views

What kind of fan connector is this?

I need to change fans of my beamer but I cant find a replacement because I dont know which connector they used. Thought it would be an 3 Pin connector but it isnt. The connector in the pictures is ...
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1answer
50 views

Thermoelectric Cooler sensor

My team and I are testing our Peltier Thermo-Electric Cooler Module+Heatsink Assembly - 12V 5A from Adafruit. We are using an external power source and sensors to get readings for the current, voltage,...
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59 views

Air conditioner fan not starting

I have a problem with my air conditioner fan not starting. As seen from the schematic below, when I test for voltage between the brown and black wires, I get 0 V (this is the problem). The indoor unit ...
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2answers
61 views

How to choose the correct pc fan? [closed]

I need to replace a pc-fan 2 pin(80X80X25mm). The only details it has are:12V/0.14A.(no RPM/CFM details). Will those details(voltage/current)enough and i can pick any 80X80X25mm 2-pin pc fan which has ...
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1answer
215 views

12V PWM controller for 12V fan that gets faster with the COLD

I need a controller for a 12 V - 1A fan, blowing on the cold side of a Peltier element to keep it at constant temperature. I have the hot side under control. I have seen multiple cheap PWM ready-to-...
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3answers
165 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 ...
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116 views

Ceiling fan speed controller question

I need to connect 15 ceiling fans. Each bay has 3 ceiling fans that will run of the same speed controller, so 5 controllers in total. They will be wired from a separate circuit from the DB box. Here's ...
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1answer
124 views

What type of motor is this? (photo included)

I want to make this motor work, but I can't understand what type this is. I supplied 5V DC to the terminals, but it just kept buzzing and the coils were energized. It also had some kind of circuit, ...
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67 views

Can I use a pc case fan for a tumble dryer? [closed]

My tumble dryer is broken. I found the service manual online and according to the error number the heat pump fan is the problem. I open it up and to my surprise I found a standard sized case fan in ...

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