Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Peter Kirchhofer (peter.kirchhofer@jaquet.com )
Organization:JAQUET Ltd
Date posted: Fri Sep 21 8:31:59 US/Eastern 2001
Subject: Microphonic Effect of SMD Ceramic Capacitors
Message:
Problem: An FM demodulator printed circuit board produces an output signal, when the board is vibration tested on a shaker or if it is hit with any hard plastic tool. Mechanically decoupling the relevant capacitors fixes the problem, but this is an expensive solution. Question: Does anybody know about the related dielectric characteristics (e.g. capacity change vs pressure) for different capacitor dielectrica ?

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