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Entry  Tue Dec 13 13:07:58 2016, yinzi, DailyProgress, TempCtrl, driver board update IMG_5826.JPGIMG_8115.JPG
    Reply  Tue Dec 13 18:20:41 2016, Koji, DailyProgress, TempCtrl, driver board update 
       Reply  Fri Dec 16 12:43:52 2016, not Koji, DailyProgress, TempCtrl, driver board update 
          Reply  Sat Dec 17 01:51:24 2016, Koji, DailyProgress, TempCtrl, driver board update 
Message ID: 1791     Entry time: Tue Dec 13 18:20:41 2016     In reply to: 1790     Reply to this: 1793
Author: Koji 
Type: DailyProgress 
Category: TempCtrl 
Subject: driver board update 

Please don't use red WIMA (or any film) capacitors for power line bypassing (decoupling). These are for audio frequency signal filtering.

Use high-K cetamic caps (~100nF) for bypassing. They should be placed as close to the chips as possible.

In addition, 100uF electrolytic caps should be added to the regulators to prevent regulator oscillations.
 

Useful links:
https://en.wikipedia.org/wiki/Decoupling_capacitor
http://www.analog.com/media/en/training-seminars/tutorials/MT-101.pdf

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