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 Post subject: List of safe fan contollers?
PostPosted: Fri May 16, 2003 7:27 pm 
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Joined: Fri Apr 11, 2003 12:53 am
Posts: 110
Ok as far as I know, the zalman multi fan controller and the sunbeam are based around rheostats and are safe to use. On the list of controllers NOT safe to use include any that use pulse width modulation (PWM) such as the vantech and nexus.

Seems people like to name their pwm rigs after rheostats such that it's hard to shop for these things as a consumer.

anyone care to list these up, like to see this info in the recommended area of the main site.

Cheers!
-Liq

edited away all those nasty typos.. teaches me to post while on the phone.


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 Post subject:
PostPosted: Sat May 17, 2003 1:10 pm 
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Joined: Wed Mar 26, 2003 3:52 am
Posts: 1115
Location: EU
NON-PWM (should not cause additional buzzing with fans):

Zalman ZM-MFC1 Multi fan speed controller
Sunbeam Rheobus Fan controller

According to reviews I've read the small heatsinks on the Zalman get painfully hot to touch pretty quickly. It may contribute to case heat increase slightly.

regards,
Halcyon


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 Post subject:
PostPosted: Sat May 17, 2003 2:25 pm 
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Joined: Sun May 11, 2003 2:31 pm
Posts: 351
Location: S Yorks, OK
halcyon wrote:
...According to reviews I've read the small heatsinks on the Zalman get painfully hot to touch pretty quickly.
Reviewers do like to overload controllers. :roll:

With typical single case fans a small (25-30C/W) sink is fine. In fact, doing the maths, a 200mA fan running at 6v 100mA will produce 0.6W in the control chip; a TO-220 casing with no heat sink has a thermal resistance around 65C/W so will only get to about 40C over ambient, say 65C tops. Hot but safe.

Back on topic, any review photos showing medium/large heatsinks is 99% certain a linear controller, no heatsink PWM.


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 Post subject:
PostPosted: Sat May 17, 2003 6:16 pm 
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Joined: Mon Apr 21, 2003 4:44 pm
Posts: 192
Location: London, UK
As written, dont really worry about the heat or temperatures of LM78xx chips. They are rated to over 120 C and the heat they put out should not affect case temperatures.


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 Post subject:
PostPosted: Sun May 18, 2003 3:28 am 
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Joined: Fri Mar 21, 2003 1:34 am
Posts: 93
Location: the Netherlands
Isn't this basically the same topic?

http://forums.silentpcreview.com/viewtopic.php?t=4522


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