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Questions tagged [fan]

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

36 questions with no upvoted or accepted answers
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2
votes
2answers
600 views

Ceiling Fan Speed Control stripped down

I am a novice but know enough to get by. I was given an older Hunter Fan that is only operated via Remote. I have cut the receiver out because I do not have the remote and from what I have read they ...
2
votes
0answers
499 views

What's necessary to properly decouple/filter a PWM-controlled fan from an Arduino?

I've got a small problem I could use some help with. I am using an Arduino to control a cooling system I am building for a DSLR. Primary goals are to use PWM and some pots to control TEC power, as ...
1
vote
0answers
73 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 ...
1
vote
0answers
52 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 ...
1
vote
1answer
2k views

4-pin PC Fan PWM control and speed monitoring

I want to control and monitor the speed of a 4-pin PC fan using an esp8266. When there is no PWM control signal sent to the fan from the esp this code reports the fan speed correctly. However, ...
1
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0answers
82 views

What fan could I use to extract hot air from an oven?

I am making an reflow oven. I've decided to use the picoReflow to do the job and monitor it. The oven is originally a lab oven, and it doesn't cool quickly at all. It has a vent at the top which I'd ...
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
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0answers
476 views

DIY PWM Fan Controller; Speed changing too fast

I couldn't think of a way to explain all this in one line, so apologies for the slightly vague title. I've built a PWM Fan Controller for a DIY Laptop Cooling Pad Project. It theoretically works, and ...
1
vote
0answers
224 views

Gate resistor needed for this circuit?

I'm making a simple circuit for driving a fan based on temperature. Given that the LM339 needs a pull up (R5) do I need to put a series resistor in between the LM339 output and the gate of the ...
1
vote
0answers
4k views

Reversing the direction of rotation of a DC cooling fan

We usually connect a small DC cooling fan as show in the diagram. But is there any method to reverse the rotation of this fan in real time, by adding any external circuits?
1
vote
1answer
2k views

Proper configuration of a PWM fan which should be stopped when the controller power is cut off

Recently I am working on a controller to drive a PWM fan (datasheet). I am using a atmega32u4 and it sends a 25khz PWM signal to the fan and it's working well. I want the fan to be off when I cut the ...
0
votes
0answers
21 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 ...
0
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0answers
19 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 ...
0
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0answers
44 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 ...
0
votes
0answers
30 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 ...
0
votes
1answer
24 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. ...
0
votes
1answer
31 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 ...
0
votes
1answer
57 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 ...
0
votes
1answer
47 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,...
0
votes
0answers
112 views

Repair or reuse 4-wire pwm pc fan that I broke by swapping GND with 12v

It is a 4-wire PC PWM Fan that I broke by swapping the GND and 12v for 2-3s. I did it because I thought it could reverse the direction like in other motors. So, something is dead in the fan. I remove ...
0
votes
0answers
106 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 ...
0
votes
0answers
38 views

What if voltage is decreased for an electrical fan (DC Motor)

Will the speed of rotation decrease or increase? I have an idea of Lorentz Force and all that. Use P=VI and V=IR to explain this to me please. I can't understand what will be the outcome of decreasing/...
0
votes
1answer
80 views

Should I use constant current or constant voltage drivers for driving my PWM 24V DC Fans?

Hi everyone thanks for stopping by to lend your thoughts. I need to run 2 circuits separately and control via Arduino uno PWM. One circuit is 2x Noctua NF-A14 industrialPPC-24V-3000 Q100 IP67 with ...
0
votes
0answers
31 views

How will the ceiling fan behave if I put unequal turns on different slots of same coil?

Recently I opened a ceiling fan in my home trying to understand its basic operating principle.While i was through it a few questions popped up in my mind, which are as follows:- 1.What will happen if ...
0
votes
0answers
30 views

Can I control a Sanyo Denki fan to operate with uniform noise?

I bought this replacement Sanyo Denki fan for my air purifier. The sound out of that fan is louder than the other two pre-installed fans. The original fans mfg is out of business, and replacement ...
0
votes
1answer
161 views

Running a 12V PWM Water pump on a 5V fan output with tacho input

So on my 3D printer from Prusa they use 5V fans and monitor the fans by the tacho signal. I want to replace the hotend with a water cooled version and still want to have the safety feature to turn ...
0
votes
0answers
231 views

Using open collector output from fan sensor to opto-isolator for MCU GPIO

I have a cooling system that uses an external temperature sensor to turn on two HDF4020L-12HHB 12VDC fans and I need to use the locked rotor sensor outputs from the fans as inputs to a MCU (5V logic) ...
0
votes
0answers
130 views

PWM dimming with ZCD generates humming noise from fan at low speeds

I have created a circuit which implements PWM dimming using phase cutting with Zero cross detection which works well on incandescent bulbs but creates humming noise when connected to a fan. I am using ...
0
votes
1answer
58 views

Fan control using oscillator with varying capacitance

We have been working on a small project trying to build a fun game but are having some issues. We basically need an oscillator that can be controlled by varying the distance between our hands and a ...
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
2answers
157 views

Can I control an extractor fan with a ceiling fan controller

Help needed please on controlling a extractor fan... I've design and having built a flush ceiling kitchen extractor fan. I'm planning to use a Vent Axia ACM150 (50 Watt) inline fan But trying to ...
0
votes
1answer
231 views

Rig a BJT to drive a fan

I wanted to see if i could use a BJT to power a small pc fan. I have a potentiometer into the base but how would I wire the fan so that depending on the base current it would adjust the current to the ...
0
votes
1answer
824 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
votes
1answer
602 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 ...
-1
votes
0answers
36 views

Is it possible to electronically control the physical speed switch on air movers?

I have a few consumer level air movers (Xpower) that have a 3 speed physical switch. Is there a way I could replace the physical switch with something that would interface with a microcontroller to ...
-1
votes
1answer
370 views

Modding Copper Heatsink - Fans for Better Heat Dissipation

I have been working on a little project of mine in which I try cool a small peltier using this laptop heat sink fan. The peltier I am using is rated 10W, while the laptop fan is rated for 18W of ...