A message from our CEO about the future of Stack Overflow and Stack Exchange. Read now.

Questions tagged [fan]

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

Filter by
Sorted by
Tagged with
3
votes
2answers
18k views

Temperature-Controlled Fan

How do I trigger a fans function after a setpoint temperature is reached? I want to avoid using a PID Controller, and my heating element will be external of the circuit. Once the fan cools the ...
1
vote
2answers
6k views

what's the cheapest/fastest way to put a potentiometer on an ac fan?

I'd like to control a couple ac fans running on mains voltage (US) using a potentiometer. I believe they're in parallel but I'm not certain. Each fan is rated at 15/13 watts @ 115 volts What's the ...
1
vote
2answers
4k views

What if I try to connect a 12V@0.16A computer case fan to my USB port?

What happens if I try to connect a 12V@0.16A computer case fan to my USB port? Purchased a USB laptop HDD enclosure lately but it coming with no fans. So I thinking of putting fans around enclosure ...
3
votes
2answers
4k views

Plugging fans inito a USB port

I'm sorry for such a simple question, but I'm pretty much brand new to this stuff. I want to wire up in parrallel and plug in 3 little fans to a USB for power, however, these 3 fans are 12 volt .12 ...
3
votes
1answer
4k views

Why higher temperatures shorten the lifespan of a PC component?

It is usually advised to keep the temperatures low for every component of a PC. Not only there is a fan (or similar system) for the CPU or GPU, but there are optional fans for RAM, or hard disks. ...
3
votes
2answers
6k views

What causes the increased power consumption of a window air conditioner in the afternoon?

I installed a new 8000 BTU window mount air conditioner on the weekend on a wall that is west facing. I plugged it into a Kill-A-Watt to monitor its power consumption and noticed in the morning, when ...
3
votes
3answers
2k views

Advice making simple solar shed vent from salvaged panel

I have a 10'x10' shed that gets hot as hades inside, and want some ventilation involving pushing air through a hole I would punch in a wall near the roof peak and screen over so my friends the wasps ...
11
votes
4answers
15k views

How do I eliminate PWM noise when driving a fan?

I'm driving a 12V 0.11A brushless DC fan with PWM using an MSP430Gxxxx --> TC427CPA FET driver --> BS170 N-FET. The fan is on the low side of the FET. Even with a duty cycle of 90% and a frequency of ...
3
votes
1answer
3k views

220v AC Fan regulator

i need to regulate the speed of a noisy kitchen FAN from a microcontroller (arduino board), i have been looking around and checked a lot of websites and schematics, and i think the solution should ...
1
vote
5answers
346 views

Crude/inexpensive AC to DC transformer

I am working on a circuit that is completly powered by 5VDC from a USB port. The circuit uses SSR's to turn on and off 120VAC from a standard wall plug; the 120VAC powers a high-power heater of sorts. ...
1
vote
1answer
465 views

Using a 4-pin computer fan controller without the load

Is it OK if I use the controller from a CPU fan without connecting the motor's coils? All I want is to use the Hall effect sensor. The datasheet is posted here, the driving output circuit uses a ...
5
votes
2answers
3k views

Life expectancy of fan with magnetic bearing?

I asked this on Superuser a while ago, but since fans are often used for cooling electronic devices, I think that the question would be on-topic here too. So how long is life expectancy of fan with ...
18
votes
5answers
62k views

How to interpret the output of a 3-pin computer fan speed sensor?

I have a 3-pin 12 V computer fan and I want to interpret its speed sensor output. At the yellow wire I get something that looks like pulse-with modulation. How would I interpret the output without ...
1
vote
1answer
612 views

Do automotive relays come with TVS diodes?

The 500W inductive load question got me thinking. Cars have large radiator fans that often draw more than 15A and are pretty inductive. Do automotive relays have any sort of protection from ...
21
votes
8answers
61k views

Fans: suck or blow?

For a fan, should air be sucked in, or should it blow air out? I'm talking about an enclosure mounted fan.