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Topic: Eliminate a "singing" ventilator (Read 1 time) previous topic - next topic

-JP-

Hello,
since I declare the Adruino to my new hobby I learned a lot about electronic but not enough to make my ventilator quite.
I would like to control the speed of the ventilator by using the PWM signal of the Adruino. I used one of the many existing examples and rebuild it on my breadboard. It works so far but the noise is ugly as long it run less than 100%. I didn't found any explanation which I a can understand with my knowledge so far. I read something about a capacitor which I shoud use but I do not now where I install it in my setup.
I am pretty sure that one of you expert is able to help me.
Attached you will find the current setup on my breadboard.

Thanks in advance

J├╝rgen
-JP-


Grumpy_Mike

The only way is to increase the PWM speed so that it is above the range of human hearing.
http://playground.arduino.cc/Code/PwmFrequency#.Ux9bOl6prdU

zim0609

use a filter on the pwm signal, I found this videos useful for that.

http://www.youtube.com/watch?v=OBM5T5_kgdI
http://www.youtube.com/watch?v=4CcIFycCnxU

Grumpy_Mike

Quote
use a filter on the pwm signal,

no.

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