Author Topic: Temperature issues with DL1608  (Read 132 times)

WK154

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Temperature issues with DL1608
« on: October 15, 2020, 03:32:48 PM »
On another forum for the XR18 I had a discussion about the lack of a fan with Uli B. He was of course defending B... decision not to include a fan in the product. Unfortunately it is a well known fact that for every 10C the MTBF (Mean Time Between Failures) drops in half. Some component values also change with aging which is also accelerated with elevated temperatures. So having wanted to always cut cooling slots into the high part of the DL1608 (between the connectors and the pots) I at least measured the case surface temperature and found the following:

 The case temp at the front (close to ambient) at 80F resulted in a temp of 110F at the a fore mentioned peak, a 30F difference. Considering that this is only the surface temperature of the housing you can add an additional 20F to the part temperature and more to get the junction temp that part specs limits are based on. If I have time I will try out a 40mm fan added to the DL1608 to alleviate this drastic temp gradient and increase the DL1608 MTBF. Typically the iPad and other tablets will fail at elevated temp above 95F and requires cooling in the audio system. Has anyone here attributed DL failures due to elevated temperatures especially in direct sunlight which typically adds another 20F compared to shade?
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DigtheDL

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Re: Temperature issues with DL1608
« Reply #1 on: October 15, 2020, 11:30:16 PM »
WK, When I first got my DL1608 it ended up in direct sunlight at an outside show.  It wasn't in the sun when we initially set up...but as the sunlight moved the DL ended up in it's path.  It wasn't the DL that had a problem, but the docked iPad (we only had one iPad at first) that overheated and shut down.  I can remember our soundman standing in a bathroom at our local zoo holding the iPad up to the air-conditioning vent.  The iPad cooled down and the show went off without a hitch.  We learned our lesson and always made sure that the DL and iPads were kept in the shade.  We never had problems with the DL itself overheating and we played many outside shows in close too, or over, 100 degree weather.