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Subject: Re: Need help with temp-control design!
References: <3D7563D0.F236300D@charter.net> <3D76A561.14DDF579@charter.net> <email@example.com> <5AKd9.175618$8aG1.firstname.lastname@example.org>
From: Bernd Felsche
Date: Fri, 6 Sep 2002 10:55:34 +0800
"Spehro Pefhany" writes:
>In sci.electronics.design Bernd Felsche wrote:
>> John Woodgate writes:
>>>I read in sci.electronics.design that Bernd Felsche >>inet.net.au> wrote (in ) about
>>>'Need help with temp-control design!', on Thu, 5 Sep 2002:
>>>>You're also in for a cacophony when all fans are running.
>>>>About 50dBA each; times seven is around 71dBA.
>>>How do you get 21 dB increase from 7 fans?
>> IIRC (and I admit that I was struggling to stay awake during
>> lectures), each additional sound source of equal magnitude doubles
>> the power and hence the 3dB rise per source.
>> Ummm... yeah; should be an 18dB rise for the six _additional_ fans.
>Wouldn't that be more like 64 fans (6 doublings or 2^6 fans, using your
Thanks for reminding me of my fallability. It's less than 9dB rise.
/"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
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