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 From:  "Norman H. Azadian" <norman at azadian dot ch>
 To:  Rolf Sommerhalder <rolf dot sommerhalder at alumni dot ethz dot ch>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] WRAP heat dc++
 Date:  Mon, 27 Jun 2005 18:25:38 +0200
My supply sure looks linear, so I cranked it up to +12VDC.  Now, at 32C 
ambient temperature, the supply seems cooler to the touch, and the firewall 
is working without a hitch.  Maybe I won't have to spring for the better 
one after all.

Thanks all for your comments and suggestions.

Norman H. Azadian    Taegerishalde 13    CH-3110 Muensingen    Switzerland
norman at azadian dot ch      tel: +41 31 721 7855      fax: +41 31 55 898 55

Rolf Sommerhalder wrote:
> My WRAP1C is running a customized version of 1.2b8 as filtering bridge 
> and traffic shaper in front of my firewall. The ambient temperature 
> often is 28 to 30°C these hot summer days but the system runs stable.
> The WRAP1C is in the original alu box with its cover on. No cooling like 
> a fan or so around it. The CPU load is between 5 and 15% (only, on a
> 4 Mbit/s symmetric ISP connection). I use the 18VDC plugin power supply 
> as supplied by PCEngines.
> So, if you are using a regulated power supply, try to crank up its 
> output voltage towards 18VDC. Because if your PS is "linear" regulated 
> and not "switched" this will reduce its power dissipation and there it 
> produces less heat. This may help to stabilize operation if your PS 
> tends to become "soft" with increasing ambient temperature.
> The power supply onboard WRAP is of switched type which is very 
> efficient and produces little heat to convert the 18VDC down to required 
> 3.x and 5VDC.
> Rolf
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