Computer Fan speed Controller - Electronic Circuits Projects Diagrams Free

Gayan Soyza · 24th January 2007, 03:17 AM

Has anybody tried this circuit? Its an Automatic Fan Speed Controller for PC's.
Designed under a MOSFET.very simple.just adjusting the Gate Voltage through THERMOSTAT & V/R to control the Output.this works fine.I added to my PC (System Fan) & for my Amp.Here is the original link you can get more information from that........... try it.

http://www.heatsink-guide.com/conten...=control.shtml

cheers

Sceadwian · 24th January 2007, 03:51 AM

It's a horribly simple circuit.. It waste the energy it doesn't send to the fan as heat in the fet. Modern PC's use a fixed frequency PWM with a variable duty cycle to control the power getting to the fan, easy enough to do with a simple 555, and depending on the PC significantly more efficient.

Gayan Soyza · 24th January 2007, 04:01 AM

Quote:

Originally Posted by Sceadwian

It's a horribly simple circuit.. It waste the energy it doesn't send to the fan as heat in the fet. Modern PC's use a fixed frequency PWM with a variable duty cycle to control the power getting to the fan, easy enough to do with a simple 555, and depending on the PC significantly more efficient.

Ya its correct PWM more efficient than this.but with descretes it's the only cct I found.I alredy made this 555 as usual.it's controling well.

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24th January 2007, 03:51 AM	(permalink)
Sceadwian	It's a horribly simple circuit.. It waste the energy it doesn't send to the fan as heat in the fet. Modern PC's use a fixed frequency PWM with a variable duty cycle to control the power getting to the fan, easy enough to do with a simple 555, and depending on the PC significantly more efficient. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."