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Old 10th June 2012, 02:06 PM   #1
diyAudio Member
Join Date: May 2012
Location: Taipei
Default A strange temperature about my LM3875 ??

I finished my LM3875 chip amp , I tried it with my IPOD and HTC ,there is no problem at all and it's working perfectly。The only thing i am curious about is the Temperature,when my source are ipod and HTC the Temperature is about 55 degree,But when it comes to my computer(3.5mm) the Temperature rise to 105 degree!!!what makes the temperature so difference when i have different soure???
PS:There is no problem with the TR and volt

Last edited by perfectbell2; 10th June 2012 at 02:24 PM.
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Old 10th June 2012, 02:35 PM   #2
johnr66 is offline johnr66  United States
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Join Date: Mar 2009
Could be an inaudible HF oscillation when connected to the computer.
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Old 10th June 2012, 02:48 PM   #3
diyAudio Member
Join Date: May 2012
Location: Taipei
Thanks for your explanation that is possible because the computer's power is very dirty!!it is possible for the HF to get into the LM3875 。So is there any solution? useing a dac??
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Old 10th June 2012, 05:57 PM   #4
hurtz is offline hurtz  Germany
diyAudio Member
Join Date: Jun 2010
A decent sound card with good RF filtering can help or you can add RF-filtering to the amp itself, solving it for any source. For example 47pF across the input RCA is common.

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